Jaime A. Hirtz, ORCID: 0000-0002-6701-0137 Joseph P. Colgan, ORCID: 0000-0001-6671-1436 Bryant W. Platt, ORCID: 0000-0001-6389-9015 Samuel A. Johnstone, ORCID: 0000-0002-3945-2499 Warren P. Roe, ORCID: 0000-0001-9667-1906 20250601 vector digital data https://doi.org/10.5066/P13TSV2J Samuel A. Johnstone, ORCID: 0000-0002-3945-2499 Joseph P. Colgan, ORCID: 0000-0001-6671-1436 Warren P. Roe, ORCID: 0000-0001-9667-1906 20250601 1.0 publication U.S. Geological Survey Data Series 1210 https://doi.org/10.3133/dr1210 The USGS National Cooperative Geologic Mapping Program (NCGMP) was directed by Congress to create a new geologic map of the United States” by “bring[ing] together detailed national and continental-resolution 2D and 3D information produced throughout the Survey and by federal and state partners” (House Report 116-100). To fulfill this goal, the NCGMP created a map synthesis engine (Johnstone and others, 2025) based on the Geologic Map Schema (GeMS) standard (NCGMP, 2020) and used it to bring together source geologic maps originally published by the USGS and State Geological Surveys. This thematic map layer was derived from this database using procedures described by Johnstone and others (2025) and is intended to serve as a legible national map of the nation; while it retains full descriptions of geologic units from source materials it does not include the full search functionality (described in Johnstone and others, 2025) that is facilitated by a true relational database. The Precambrian Geology layer depicts all Precambrian rocks in the United States, inclusive of map units with minimum ages younger than Precambrian, such as the “Paleozoic to Precambrian” units shown on some older maps. The map was composited from all geologic maps that show Precambrian rocks, including where they are mostly buried beneath Phanerozoic sedimentary rocks and inferred from boreholes and geophysical data. In areas covered by maps of both Precambrian outcrops and buried Precambrian basement, the outcropping Precambrian units are preserved instead of the more generalized buried units. Due to the great disparity in scale and degree of interpretation between outcrop maps and subsurface maps, the Precambrian layer is highly discontinuous along map boundaries. Phanerizoic rocks are included in the map, subdivided into stratified rocks vs. igneous and metamorphic rocks. The map is structured as a single GeMS database with three additional tables (also described in Johnstone and others, 2025); a Source_DescriptionOfMapunits table preserves all source inputs, a synthesis_to_source_units table relates aggregated national units to original map units, and a Symbol_Lookup table provides definitions of all FGDC geologic map symbol code values (U.S. Geological Survey, 2006) used for stylizing the map. Where contacts seperated two different units on a source map, but not seperate polygons of the same national synthesis unit, those contacts have been reclassified as "internal contacts." This data provides a consistent depiction of the geology of the conterminous United States at a national resolution (approximately 1:500,000). It is a compilation of previously published maps. Original maps have not been modified, but additional attribution allows them to be displayed as a more consistent national depiction, while still retaining original unit descriptions. In some instances, only portions of a map have been used to isolate certain thematic features (e.g., Quaternary units). ngs_gems_precambrian is a composite geodataset that conforms to GeMS (Geologic Map Schema)--a standard format for the digital publication of geologic maps", available at http://ngmdb.usgs.gov/Info/standards/GeMS/. Metadata records associated with each element within the geodataset contain more detailed descriptions of their purposes, constituent entities, and attributes.An OPEN shapefile versions of the dataset is also available. It consists of shapefiles, DBF files, and delimited text files and retains all information in the native geodatabase, but some programming will likely be necessary to assemble these components into usable formats. These metadata were prepared with the aid of script GeMS_FGDCMetadata.py, version of 2/27/24. 1966 2017 publication date Complete As needed -128.8229 -65.2549 51.6279 22.5573 Conterminous United States USGS Metadata Identifier USGS:4ef33cc0-d57c-47b8-a26e-e6a6448759a5 None Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. U.S. Geological Survey NGMDB mailing

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Reston VA 20192 NA ngmdb@usgs.gov Confidence that a feature exists and confidence that a feature is correctly identified are described in per-feature attributes ExistenceConfidence and IdentityConfidence. Data were produced in a relational database with numerous embedded referential integrity and value range checks. Exported data was evaluated for GeMS compliance. Individual entries are considered complete within this data set. Estimated accuracy of horizontal location is given on a per-feature basis by attribute LocationConfidenceMeters. Values are expected to be correct within a factor of 2. A LocationConfidenceMeters value of -9 or -9999 indicates that no value has been assigned. This synthesis of geology was produced by bringing together component geologic maps produced in the Geologic Map Schema (GeMS) into a map synthesis engine as described by: Johnstone, S.A., Colgan, J.P., and Roe, W.P., 2025, A synthesis engine for constructing geologic maps of the United States: U.S. Geological Survey Data Series 2025-1210, https://doi.org/10.3133/dr1210 2025 Vector Albers Conical Equal Area 29.5 45.5 -96.0 23.0 0.0 0.0 coordinate pair 0.6096 0.6096 meters North_American_Datum_1983 GRS 1980 6378137.0 298.257222101 DescriptionOfMapUnits Non-spatial table that captures content of the Description of Map Units (or equivalent List of Map Units and associated pamphlet text) included in a traditional paper geologic map. Has an internal hierarchy expressed by attribute HierarchyKey GeMS OBJECTID Internal feature number ESRI Unrepresentable domain MapUnit Short plain-text identifier of the map unit. Foreign key to DescriptionOfMapUnits table. GeMS Ygg Granitic rocks This Report pC Undifferentiated Precambrian rocks This Report Aum Ultramafic rocks This Report Ai Intrusive rocks This Report Zu Undifferentiated Neoproterozoic rocks This Report PZpCm Metamorphic rocks This Report PZpCu Undifferentiated Paleozoic to Precambrian rocks This Report Ymc Carbonate and meta-carbonate rocks This Report Zm Metamorphic and igneous rocks This Report Xu Undifferentiated Paleoproterozoic rocks This Report Ymss Clastic sedimentary rocks This Report Au Undifferentiated Archean rocks This Report Xif Iron formation This Report Aig Granitic rocks This Report Yms Sedimentary and metasedimentary rocks This Report Ymg Mafic intrusive rocks This Report PRu Undifferentiated Proterozoic rocks This Report Xim Gabbro and mafic lava flows This Report CAZms Metasedimentary rocks This Report water Water and ice This Report Xmsq Quartzite This Report Zg Granitic rocks This Report af Artificial fill This Report Xi Igneous and metaigneous rocks This Report unmapped Unmapped areas This Report Yl Igneous rocks This Report PHs Phanerozoic cover rocks This Report Zms Metasedimentary rocks This Report PZpCg Igneous rocks This Report Ams Metasedimentary rocks This Report PZpCms Metasedimentary rocks This Report Xig Granitic rocks This Report Zmg Metaigneous rocks This Report scz Shear zone rocks This Report Yu Undifferentiated Mesoproterozoic rocks This Report PRum Ultramafic rocks This Report Xms Metasedimentary rocks This Report PZpCmg Metaigneous rocks This Report PHi Phanerozoic igneous rocks This Report Xmss Slate and sandstone This Report PZpCum Ultramafic rocks This Report Aif Iron formation This Report Zs Clastic sedimentary rocks This Report Name Name of map unit, as shown in boldface in traditional DMU, e.g., "Shnabkaib Member". Identifies unit within its hierarchical context. GeMS Unrepresentable domain FullName Name of map unit including identification of containing higher rank unit(s), e.g., "Shnabkaib Member of Moenkopi Formation". GeMS Unrepresentable domain Age Age of map unit as shown in Description of Map Units. Examples of values are "late Holocene", "Pliocene and Miocene", "Lower Cretaceous". GeMS Unrepresentable domain Description Free-format text description of map unit. Commonly structured according to one or more accepted traditions (e.g., lithology, thickness, color, weathering and outcrop characteristics, distinguishing features, genesis, age constraints) and terse. GeMS Unrepresentable domain HierarchyKey String that records hierarchical structure. Has form nn-nn-nn, nnn-nnn, or similar. Numeric, left-padded with zeros, dash-delimited. Each HierarchyKey fragment of each row MUST be the same length to allow text-based sorting of table entries. GeMS Unrepresentable domain ParagraphStyle Token that identifies formatting of paragraph(s) within traditional Description of Map Units that correspond to this table entry. GeMS DMUUnit3 Paragraph style for description of a second-order map unit within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, 0 pt 1st line indent, 9 pt space before USGS Science Publishing Network DMUUnit2 Paragraph style for description of a second-order map unit within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, -10 pt 1st line indent, 3 pt space before USGS Science Publishing Network DMUHeading2 Heading style for second-order headings within Description of Map Units table. Such headings are subsidiary to the primary heading "Description of Map Units". Times New Roman, bold, 10 pt, 12 pt leading, all caps, centered, 12 pt space before. USGS Science Publishing Network DMUUnit1 Paragraph style for description of a first-order map unit within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, -20 pt 1st line indent, 3 pt space before. USGS Science Publishing Network Label Plain-text equivalent of the desired annotation for a feature: for example "14 Ma", or "^c" which (when used with the FGDC GeoAge font) results in the geologic map-unit label TRc (with TR run together to make the Triassic symbol). GeMS Unrepresentable domain Symbol Reference to a point marker, line symbol, or area-fill symbol that is used on the map graphic to denote the feature: perhaps a star for a K-Ar age locality, or a heavy black line for a fault. GeMS Unrepresentable domain AreaFillRGB {Red, Green, Blue} tuples that specify the suggested color (e.g., "255,255,255", "124,005,255") of area fill for symbolizing MapUnit. Each color value is an integer between 0 and 255, values are zero-padded to a length of 3 digits, and values are separated by commas with no space: NNN,NNN,NNN. GeMS Unrepresentable domain AreaFillPatternDescription Text description (e.g., "random small red dashes") provided as a convenience for users who must recreate symbolization. GeMS Unrepresentable domain DescriptionSourceID Source of map-unit description; foreign key to table Datasources. GeMS vocab1 This Report This report GeoMaterial Categorization of map unit based on lithologic and genetic character, term selected from NGMDB standard term list defined in Appendix A of GeMS documentation, available at http://ngmdb.usgs.gov/Info/standards/GeMS.. GeMS Water or ice Water or ice GeMS Other materials Other materials GeMS Metaigneous rock Rock derived from preexisting igneous rocks and altered by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, shear stress, and (or) chemical environment, generally at depth in Earths crust. GeMS Coarse-grained intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. GeMS Metasedimentary rock Rock derived from preexisting sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. GeMS Quartzite Rock derived from preexisting quartz-rich sedimentary rocks (commonly sandstone) and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, shear stress, and (or) chemical environment, generally at depth in Earths crust. GeMS Slate and phyllite, of sedimentary-rock origin Fine-grained rock derived from preexisting sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Includes phyllite and slate (compact, fine-grained rock that possesses strong cleavage and, hence, can be split into slabs and thin plates). Mostly formed from fine-grained material such as mudstone. GeMS Rock Various rock types, not differentiated. GeMS Meta-carbonate rock Rock derived from preexisting carbonate sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Characterized by recrystallization of carbonate minerals in source rock. Includes marble (for which preexisting rock was dominantly limestone or other rock composed of calcite), dolomitic marble, meta-dolostone, and meta-dolomite (for which preexisting rock contained appreciable amount of magnesium). GeMS Metamorphic rock Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. GeMS Sedimentary material An aggregation of particles deposited by gravity, air, water, or ice, or as accumulated by other natural agents operating at Earths surface such as chemical precipitation or secretion by organisms. May include unconsolidated material (sediment) and (or) sedimentary rock. Does not include sedimentary material directly deposited as a result of volcanic activity. GeMS Meta-ultramafic rock Rock derived from preexisting ultramafic rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed mostly of magnesium-bearing minerals (for example, serpentine, talc, magnesite). GeMS Coarse-grained, mafic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed mostly of feldspar and dark-colored minerals. Includes gabbroic rock. GeMS Clastic sedimentary rock Sedimentary rock, composed predominantly of particles or clasts derived by erosion, weathering, or mass-wasting of preexisting rock and deposited by gravity, air, water, or ice. GeMS Medium and high-grade regional metamorphic rock, of unspecified origin Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to relatively intense regional changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Origin of preexisting rock is mixed (for example, igneous and sedimentary) or is not known. Includes amphibolite, granulite, schist, and gneiss. GeMS Sediment Unconsolidated material (sediment) composed of particles deposited by gravity, air, water, or ice, or as accumulated by other natural agents operating at Earths surface such as chemical precipitation or secretion by organisms. Does not include sedimentary material directly deposited as a result of volcanic activity. GeMS Coarse-grained, felsic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed mostly of light-colored minerals (for example, feldspar, quartz). Includes granitic, syenitic, and monzonitic rock. GeMS Deformation-related metamorphic rock Rock derived from preexisting rocks by essentially solid-state mineralogical, chemical, or structural changes in response to strong deformation, commonly in association with marked changes in temperature, pressure, and (or) chemical environment. Generally forms in narrow, planar zones of local deformation (for example, along faults); characterized by foliation or alignment of mineral grains. Includes mylonite and cataclasite. GeMS Iron-rich sedimentary rock Sedimentary rock, in which at least half (by volume) of observed minerals are iron bearing (hematite, magnetite, limonite group minerals, siderite, iron sulfides). GeMS "Made" or human-engineered land Modern, unconsolidated material known to have human-related origin. GeMS Igneous rock Rock and fragmental material that solidified from molten or partly molten material (magma). GeMS Unmapped area Unmapped area GeMS Mostly sandstone Mostly sandstone, interbedded with other sedimentary rocks that locally may include conglomerate and finer grained clastic rocks (mudstone), carbonates, and (or) coal. GeMS Extrusive igneous material Molten material that was erupted onto Earths surface, fusing into rock or remaining as unconsolidated particles. Includes pyroclastic flows, air-fall tephra, lava flows, and volcanic mass flows. GeMS GeoMaterialConfidence Describes appropriateness of GeoMaterial term for describing the map unit. GeMS Low The overall lithology of this map unit is not adequately classifiable using this list of terms and definitions, but the term selected is the best available. Or this map unit is insufficiently known to confidently assign a GeoMaterial term. GeMS documentation High The term and definition adequately characterize the overall lithologic nature of rocks and sediments in the map unit. Regarding the subjective term "adequately characterize", we refer to context and objectives of this classification as described in the GeMS documentation. GeMS documentation Medium The term and definition generally characterize the overall lithology of the map unit, but there are one or more significant minor lithologies that are not adequately described by the selected term. GeMS documentation DescriptionOfMapUnits_ID Primary key. GeMS Arbitrary string. Values should be unique within this database. DataSources Non-spatial table of sources of all spatial features, sources of some attributes of spatial features, and sources of some attributes of non-spatial table entries. GeMS OBJECTID Internal feature number ESRI Unrepresentable domain Source Plain-text short description that identifies the data source. GeMS Unrepresentable domain Notes Additional information specific to a particular feature or table entry. GeMS Unrepresentable domain. Free text. Values of <null> or #null indicate no entry. URL Universal Resource Locator (URL) or Document Object Identifier (DOI), identifies a document on the World Wide Web. GeMS Unrepresentable domain DataSources_ID Primary key. GeMS Arbitrary string. Values should be unique within this database. Glossary Non-spatial table that, for certain fields (including all Type fields, Confidence fields, and GeneralLithology), lists the terms that populate these fields, term definitions, and sources for definitions. GeMS OBJECTID Internal feature number ESRI Unrepresentable domain Term Plain-language word for a concept. Values must be unique within database as a whole. GeMS Unrepresentable domain Definition Plain-language definition. GeMS Unrepresentable domain DefinitionSourceID Source of definition; foreign key to DataSources. GeMS vocab2 Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. This report vocab10 USGS Science Publishing Network This report vocab4 Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. This report vocab3 U.S. Geological Survey, 2020, GeMS (Geologic Map Schema)--A Standard Format for the Digital Publication of Geologic Maps: U.S. Geological Survey Techniques and Methods 11-B10. This report vocab1 This Report This report Glossary_ID Primary key. GeMS Arbitrary string. Values should be unique within this database. Source_DescriptionOfMapUnits Description of map units for "source" map units, those used in primary map publications used in the compilation. Source_MapUnit values are prefixed with a MapSourceID value to differentiate identically-named source map units from different source maps. Otherwise conceptually equivalent to the GeMS "DescriptionOfMapUnits" table. This Report OBJECTID Internal feature number ESRI Unrepresentable domain Source_MapUnit Short, easily understood ASCII-character identifier for the source map unit. Prefixed with a MapSourceID value (from Source_DescriptionOfMapUnits) to differentiate identically-named source map units from different source maps. Otherwise conceptually equivalent to the "MapUnit" field in the GeMS "DescriptionOfMapUnits" table. This Report Unrepresentable domain Name Name of map unit, as shown in boldface in traditional DMU, e.g., "Shnabkaib Member". Identifies unit within its hierarchical context. GeMS Unrepresentable domain FullName Name of map unit including identification of containing higher rank unit(s), e.g., "Shnabkaib Member of Moenkopi Formation". GeMS Unrepresentable domain Age Age of map unit as shown in Description of Map Units. Examples of values are "late Holocene", "Pliocene and Miocene", "Lower Cretaceous". GeMS Unrepresentable domain Description Free-format text description of map unit. Commonly structured according to one or more accepted traditions (e.g., lithology, thickness, color, weathering and outcrop characteristics, distinguishing features, genesis, age constraints) and terse. GeMS Unrepresentable domain HierarchyKey String that records hierarchical structure. Has form nn-nn-nn, nnn-nnn, or similar. Numeric, left-padded with zeros, dash-delimited. Each HierarchyKey fragment of each row MUST be the same length to allow text-based sorting of table entries. GeMS Unrepresentable domain ParagraphStyle Token that identifies formatting of paragraph(s) within traditional Description of Map Units that correspond to this table entry. GeMS DMUHeading2 Heading style for second-order headings within Description of Map Units table. Such headings are subsidiary to the primary heading "Description of Map Units". Times New Roman, bold, 10 pt, 12 pt leading, all caps, centered, 12 pt space before. USGS Science Publishing Network DMUHeading5 Heading style for fifth-order headings within Description of Map Units table. Times New Roman, Italic, 10 pt, 12 pt leading, centered, 6 pt space before USGS Science Publishing Network DMUHeading3 Heading style for third-order headings within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, all caps, centered, 10 pt space before USGS Science Publishing Network DMUUnit2 Paragraph style for description of a second-order map unit within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, -10 pt 1st line indent, 3 pt space before USGS Science Publishing Network DMUUnit3 Paragraph style for description of a second-order map unit within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, 0 pt 1st line indent, 9 pt space before USGS Science Publishing Network DMUUnit1 Paragraph style for description of a first-order map unit within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, left justified, 66 pt left indent, -20 pt 1st line indent, 3 pt space before. USGS Science Publishing Network DMUHeading4 Heading style for fourth-order headings within Description of Map Units table. Times New Roman, Regular, 10 pt, 12 pt leading, centered, 8 pt space before USGS Science Publishing Network Label Plain-text equivalent of the desired annotation for a feature: for example "14 Ma", or "^c" which (when used with the FGDC GeoAge font) results in the geologic map-unit label TRc (with TR run together to make the Triassic symbol). GeMS Unrepresentable domain Symbol Reference to a point marker, line symbol, or area-fill symbol that is used on the map graphic to denote the feature: perhaps a star for a K-Ar age locality, or a heavy black line for a fault. GeMS Unrepresentable domain AreaFillRGB {Red, Green, Blue} tuples that specify the suggested color (e.g., "255,255,255", "124,005,255") of area fill for symbolizing MapUnit. Each color value is an integer between 0 and 255, values are zero-padded to a length of 3 digits, and values are separated by commas with no space: NNN,NNN,NNN. GeMS Unrepresentable domain AreaFillPatternDescription Text description (e.g., "random small red dashes") provided as a convenience for users who must recreate symbolization. GeMS Unrepresentable domain DescriptionSourceID Source of map-unit description; foreign key to table Datasources. GeMS 962 Reed, R.C., and Daniels, J., compilers., 1987, Bedrock geology of northern Michigan: Michigan Department of Natural Resources, Geological Survey Division, scale 1:500,000. This report 655 Tomhave, D.W., and Schulz, L.D., 2004, Bedrock geologic map showing configuration of the bedrock surface in South Dakota east of the Missouri River: South Dakota Geological Survey General Map 9, scale 1:500,000 This report 783 Sims, P.K., Bankey, V., Finn, C.A., 2001, Preliminary Precambrian basement map of Colorado-a geologic interpretation of the aeromagnetic anomaly map: U.S. Geological Survey Open-File Report 01-364, scale 1:1,000,000 This report 632 Berg, T.M., Edmunds, W.E., Geyer, A.R., Glover, A.D., Hoskins, D.M., MacLachlan, D.B., Root, S.I., Sevon, W.D., and Socolow, A.A. 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey Map 1, Scale 1:250,000. This report 644 Hermes, O.D., Gromet, L.P., Murray, D.P., Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Geological Survey Rhode Island Map Series Map 1, scale 1:100,000. This report 674 Mudrey Jr., M.G., Brown, B.A., Greenberg, J.K., 1982, Bedrock Geologic Map of Wisconsin: Wisconsin Geological and Natural History Survey Map M-078, scale 1:1,000,000. This report 946 Osberg, P.H., Hussey, A.M. and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Geologic Map Series BGMM, scale 1:500,000. This report 576 Ellis, Trevor, 2016, Bedrock geologic map of the Bunceton 7.5' quadrangle, Cooper County, Missouri; Missouri Geological Survey, Open File Map, OFM-2016-672-GS, scale 1:24000. | Starbuck, E.A., 2009, Bedrock geologic map of the Luystown 7.5' quadrangle Osage County, Missouri; Missouri Geological Survey, Open-File Map, OFM-09-549-GS, scale 1:24000. | Starbuck, E.A., 2004, Bedrock geologic map of the New Melle 7.5' quadrangle St. Charles and Warren counties, Missouri; Missouri Geological Survey, Open-File Map, OFM-04-477-GS, scale 1:24000. This report 1035 Tweto, Ogden, 1979, Geologic map of Colorado: U.S. Geological Survey, scale 1:500,000 This report 955 Zen, E-an, Goldsmith, R., Ratcliffe, N.M., Robinson, P., Stanley, R.S., Hatch, N.L., Shride, A.F., Weed, E.G.A., and Wones, D.R., 1983, Bedrock geologic map of Massachusetts: U.S. Geological Survey, 3 sheets, scale 1:250,000 This report 787 This Report This report 879 Spoljaric, N. and Jordan, R.R., 1966, Generalized geologic map of Delaware: Delaware Geological Survey, Special Publication 4, scale 1:297,500. This report 602 Dalton, Richard F., Monteverde, Donald H., Sugarman, Peter J., and Volkert, Richard A., compilers. Bedrock Geologic Map of New Jersey 2014. New Jersey Geological and Water Survey. 2014, Scale 1:250,000, 5 cross-sections. This report 1666 Jennings, C.W., Gutierrez, C., Bryant, W., Saucedo, G., and Wills, C., 2010, Geologic Map of California: California Geological Survey Geologic Data Map GDM-2.2010 This report 871 Love, J.D., and Christiansen, A.C., 1985, Geologic map of Wyoming: U.S. Geological Survey, scale 1:500,000 This report 838 New Mexico Bureau of Geology and Mineral Resources, 2003, Geologic map of New Mexico: New Mexico Bureau of Geology and Mineral Resources Geologic Map, scale 1:500,000 This report 921 Caldwell, D.H., Erwin, R.B., and Woodward, H.P., 1968, Geologic Map of West Virginia: West Virginia Geological and Economic Survey Map 1, scale 1:250,000. This report 935 Gray, H.H., Ault, C.H., and Keller, S.J., 1987, Bedrock geologic map of Indiana: Indiana Geological Survey Miscellaneous Map 48, scale 1:500,000 This report 1065 Kansas Geological Survey, 2008, Surficial Geology of Kansas: Kansas Geological Survey, Map M-118, scale 1:500,000 This report 985 Sims, P.K., Peterman, Z.E., Hildebrand, T.G., and Mahan, S., 1991, Precambrian basement map of the trans-Hudson orogen and adjacent terranes, northern Great Plains, USA: U.S. Geological Survey Miscellaneous Investigations Map I-2214, scale 1:1,000,000 This report 856 Heran, W.D., Green, G.N., and Stoeser, D.B., A digital geologic map database for Oklahoma: U.S. Geological Survey Open-File Report 03-247, scale 1:250,000. This report 1010 Sims, P.K., Finn, C.A., and Rystrom, V.L., 2001, USGS Open-File Report 01-199: Preliminary Precambrian Basement Map Showing Geologic-Geophysical Domains, Wyoming: U.S. Geological Survey, scale 1:1,000,000 This report 1009 This Report This report 794 Anderson, R., 2006, Geology of the Precambrian surface of Iowa and surrounding area: Iowa Geological Survey Open File Map OFM-06-7, scale 1:1,000,000. This report 1419 Digital database of the Montana state geologic map, submitted to STATEMAP in GeMS This report 621 Bluemle, J.P., 1983, Geologic and topographic bedrock map of North Dakota: North Dakota Geological Survey Miscellaneous Map 25, scale 1:670,000 This report 591 Burchett, R.R., 1986, Geologic bedrock map of Nebraska: Nebraska Conservation and Survey Division Geologic Maps and Charts 1, scale 1:1000,000 This report 579 Selves, Tyler, 2021, Bedrock geologic map of the Dover 7.5' quadrangle, Lafayette County, Missouri; Missouri Geological Survey, Open File Map, OFM-2021-712-GS, scale 1:24000. This report 580 Wagner, Richard E. and Kisvarsanyi, Eva B., 1969, Lapilli tuffs and associated pyroclastic sediments in Upper Cambrian strata along Dent Branch, Washington County, Missouri; Missouri Geological Survey, Report of Investigations 43, RI-043, vi+80 p., 2 pls., 27 figs. This report 1073 Noger, M.C., 1988, Geologic map of Kentucky: U.S. Geological Survey, scale 1:500,000. This report 623 Slucher, E.R., Swinford, E.M., Larsen, G.E., Schumacher, G.A., Shrake, D.L., Rice, C.L., Caudill, M.R., Rea, R.G., and Powers, D.M., 2006, Bedrock geologic map of Ohio: Ohio Division of Geological Survey, Map BG-1, scale 1:500,000. This report 652 Horton, J.W., Jr., and Dicken, C.L., 2000, Preliminary geologic map of the Appalachian Piedmont and Blue Ridge, South Carolina segment: U.S. Geological Survey Open-File Report 01-298, scale 1:500,000 This report 574 Thompson, Thomas L., 1995, The stratigraphic succession in Missouri (revised); Missouri Geological Survey, Volume 40-revised, 2nd series, 189 p., 42 figs., 1 tbl. This report 799 Sims, P.K., Lund, K., Anderson, E., 2005, Precambrian Crystalline Basement Map of Idaho - An Interpreatation of Aeromagnetic Anomalies: U.S. Geological Survey Scientific Investigation Map 2884, Scale 1:1,000,000. This report 614 Rickard, L.V., Isachsen, Y.W., and Fisher, D.W., 1970, Geologic Map of New York: New York State Museum and Science Service Map and Chart Series 15 (Explanatory sheet published in 1971), 5 sheets, scale 1:250,000 This report 666 Ratcliffe, N.M., Stanley, R.S., Gale, M.H., Thompson, P.J., Walsh, G.J., Hatch, N.L., Rankin, D.W., Doolan, B.L., Kim, Jonathan, Mehrtens, C.J., Aleinikoff, J.N., McHone, J.G., and Masonic, L.M., 2011, Bedrock Geologic Map of Vermont: U.S. Geological Survey Scientific Investigations Map SIM-3184, scale 1:100,000. This report 1020 Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey, Map 35, scale 1:1,000,000. This report 1066 Zeller, D.E., ed., 1968, The Stratigraphic Succession in Kansas, with contributions by J.M. Jewett, C.K. Bayne, E.D. Goebel, H.G. O'Connor, A. Swineford, and D.E. Zeller: Kansas Geological Survey Bulletin 189 This report 887 Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000. This report 1084 Snead, J.I., and McCulloh, R.P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey Geologic Map 5, scale 1:500,000. This report 1091 Thompson, D.E., 2011, Geologic Map of Mississippi; after Bickler, A.R., 1969, Geologic Map of Mississippi: Mississippi Department of Environmental Quality, Office of Geology, scale 1:500,000. This report 1408 Walker, G.W., and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000 This report 994 McCormick, K.A., 2010, Precambrian Basement Terrane of South Dakota: South Dakota Geological Survey Bulletin 41, 2 Plates, Scale 1:1,000,000. This report 1632 Schuster, J.E., 2005, Geologic map of Washington State: Washington Division of Geology and Earth Resources, Geologic Map GM-53, scale 1:500,000. This report 1055 Lawton, D.E., Moye, F.J., Murray, J.B., O'Connor, B.J., Penley, H.M., Sandrock, G.S., Marsalis, W.E., Friddell, M.S., Hetrick, J.H., Huddlestun, P.F., Hunter, R.E., Mann, W.R., Martin, B.F., Pickering, S.M., Schneeberger, F.J., and Wilson, J.D., 1976, Geologic map of Georgia: Georgia Geological Survey, scale 1:500,000 This report 970 Milstein, R.L. compiler, 1987, Bedrock geology of southern Michigan: Michigan Department of Natural Resources Geological Publication BG-01, scale 1:500,000. This report 816 Jirsa, M.A., Boerboom, T.J., and Chandler, V.W., 2012, Geologic Map of Minnesota, Precambrian bedrock geology: Minnesota Geological Survey State Map Series S-22, scale 1:500,000. This report 874 Rodgers, John, 1985, Bedrock geological map of Connecticut: Connecticut Geological and Natural History Survey, Department of Environmental Protection, 2 sheets, scale 1:125,000. This report 1102 Hardeman, W.D., Miller, R.A., and Swingle, G.D., 1966, Geologic Map of Tennessee: Tennessee Division of Geology State Geologic Map, scale 1:250,000 This report 1655 Cleaves, E.T., Edwards, J., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Scale 1:250,000. This report 577 Thompson, Thomas L., 1995, The stratigraphic succession in Missouri (revised); Missouri Geological Survey, Volume 40-revised, 2nd series, 189 p., 42 figs., 1 tbl. | Thompson, T.L., 1970, Lower Pennsylvanian conodonts from McDonald County, Missouri; Journal of Paleontology, v. 44, p. 1041-1048, pl. 139. This report 1031 McFarland, J.D., 1998 (revised 2004), Stratigraphic summary of Arkansas: Arkansas Geological Survey Circular 36, 38 p. This report 1095 Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic map of South Dakota: South Dakota Geological Survey General Map G-10, scale 1:500,000. This report 598 Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock geologic map of New Hampshire: U.S. Geological Survey, scale 1:250,000. This report 908 Virginia Division of Mineral Resources, 1993, Geologic map of Virginia, Virginia Division of Mineral Resources, series unknown, 1:500,000. This report 827 Sims, P.K., O'Neill, J.M., Bankey, V., and Anderson, E., 2004, Precambrian basement geologic map of Montana -- an interpretation of aeromagnetic anomalies: U.S. Geological Survey, Scientific Investigations Map SIM-2829, scale 1:1,000,000. This report 575 Middendorf, M.A., 1999, Bedrock geologic map of the Table Rock Lake, Missouri 30' X 60' quadrangle; Missouri Geological Survey, Open-File Map, OFM-99-350-GS, scale 1:100000. | Middendorf, M.A., Thomson, K.C., Eason, G.L., and Sumner, H.S., 1987, Bedrock geologic map of the Springfield 1° X 2° quadrangle, Missouri; United States Geological Survey, Miscellaneous Field Studies Map, USGS MF-1830-D, scale 1:250000. This report 848 North Carolina Geological Survey, 1985, Geologic map of North Carolina: North Carolina Geological Survey General Geologic Map, scale 1:500,000. This report 835 Stewart, J.H, and Carlson, J.E., 1978, Geologic Map of Nevada: U.S. Geological Survey, scale 1:500,000 This report 1047 Scott, T.M., 2001, Text to accompany the geologic map of Florida: Florida Geological Survey Open-File Report 80, 30 p. This report 812 Sims, P.K., 1990, Precambrian basement map of the northern Midcontinent, U.S.A.: U.S. Geological Survey, Miscellaneous Investigations Series Map I-1853-A, scale 1:1,000,000. This report 896 Hintze, L.F., 1980, Geologic map of Utah: Utah Geological and Mineral Survey, Map A-1, scale 1:500,000. This report 999 Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Series Map I-2185, scale: 1:500,000 This report 578 Kisvarsanyi, Eva B, 1981, Geology of the Precambrian St. Francois terrane, southeastern Missouri; Missouri Geological Survey, Report of Investigations 64 (Contribution to Precambrian Geology No. 8), vi+58 p., 1 pl., 9 figs., 10 tbls. This report 1645 Osborne, W.E., Szabo, M.W., Copeland Jr., C.W., and Neathery, T.L., 1989, Geologic Map of Alabama: Geological Survey of Alabama Special Map 221, scale 1:500,000. This report 940 Witzke, B.J., Anderson, R.R., and Pope, J.P., 2010, Bedrock Geologic Map of Iowa: Iowa Geological Survey Open-File Map OFM-2010-01, scale 1:500,000. This report 1115 Texas Water Science Center, 2015, Geologic database of Texas This report 1652 Lewis, R.S., Link, P.K., Stanford, L.R., and Long, S.P., 2012, Geologic map of Idaho: Idaho Geological Survey, Map M-9, scale 1:750,000. This report GeoMaterial Categorization of map unit based on lithologic and genetic character, term selected from NGMDB standard term list defined in Appendix A of GeMS documentation, available at http://ngmdb.usgs.gov/Info/standards/GeMS.. GeMS Eolian sediment Silt- and sand-sized sediment, deposited by wind. GeMS Coastal zone sediment Mud and sand, with lesser amounts of gravel, deposited on beaches, on barrier islands, or in nearshore-marine, deltaic, or various low-energy shoreline (mud flat, tidal flat, sabka, algal flat) environments. GeMS Metasedimentary rock Rock derived from preexisting sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. GeMS Chert Sedimentary rock, composed chiefly of microcrystalline or cryptocrystalline quartz. GeMS Coastal zone sediment, mostly coarse-grained Mostly sand, silt, and gravel, deposited on beaches, in dunes, and in shallow-marine and related alluvial environments. GeMS Igneous and metamorphic rock Consists of coarse-grained intrusive igneous rock and generally medium- to high-grade metamorphic rock. GeMS Meta-ultramafic rock Rock derived from preexisting ultramafic rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed mostly of magnesium-bearing minerals (for example, serpentine, talc, magnesite). GeMS Debris flows, landslides, and other localized mass-movement sediment Sediment formed by relatively localized, downslope transport of particles or clasts produced by weathering and breakdown of underlying rock, sediment, and (or) soil. Composed of poorly sorted and poorly stratified material that ranges in size from clay to boulders. Speed of downslope transport ranges from rapid to imperceptible. GeMS Lacustrine sediment, mostly coarse-grained Mostly well-sorted and well-bedded material, generally sand and gravel sized, with lesser amounts of silt and clay, deposited in perennial to intermittent lakes. Much of sediment is derived from material eroded and transported by streams. Mostly deposits of lake-marginal beaches and deltas. GeMS Medium and high-grade regional metamorphic rock, of unspecified origin Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to relatively intense regional changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Origin of preexisting rock is mixed (for example, igneous and sedimentary) or is not known. Includes amphibolite, granulite, schist, and gneiss. GeMS Alluvial sediment Unconsolidated material deposited by streams or other bodies of running water as sorted or semisorted sediment in streambed, or on its floodplain or delta, or as cone or fan at base of mountain slope. Grain size varies from clay to gravel. GeMS Meta-volcaniclastic rock Rock derived from preexisting volcaniclastic rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed of deformed but recognizable particles or clasts of volcanic explosive material. GeMS Intermediate-composition lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Parental magma commonly erupts from stratovolcanoes as thick lava flows. Includes rocks that are, in color and in mineral composition, intermediate between felsic and mafic rocks (for example, andesite). GeMS Pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano or caldera. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. GeMS Carbonate rock Sedimentary rock, consisting chiefly of carbonate minerals such as limestone or dolomite. GeMS "Made" or human-engineered land Modern, unconsolidated material known to have human-related origin. GeMS Playa sediment Fine-grained clastic sediment and evaporitic salts, deposited in ephemeral lakes in centers of undrained basins. Includes material deposited in playas, mud flats, salt flats, and adjacent saline marshes. Generally interbedded with eolian sand and with lacustrine sediment deposited during wetter climatic periods; commonly intertongues upslope with sediment deposited by alluvial fans. GeMS Unmapped area Unmapped area GeMS Alluvial sediment, mostly coarse-grained Unconsolidated material deposited by streams or other bodies of running water as sorted or semisorted sediment in streambed, or on its floodplain or delta, or as cone or fan at base of mountain slope. Sediment is mostly sand, gravel, and coarser material but may also contain some silt and clay. GeMS Sedimentary and extrusive igneous material Either (1) sedimentary rock and (or) unconsolidated material (sediment) and extrusive igneous material (volcanic rock and [or] sediment) or (2) volcanic rock and (or) sediment and such material after erosion and redeposition. GeMS Metaigneous rock Rock derived from preexisting igneous rocks and altered by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, shear stress, and (or) chemical environment, generally at depth in Earths crust. GeMS Coarse-grained intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. GeMS Meta-felsic and intermediate rock Rock derived from preexisting felsic and intermediate-composition rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed mostly of light-colored minerals; relatively enriched in silica. Includes metagranite, metadiorite, and meta-andesite. GeMS Marine sediment, mostly coarse-grained Mud, sand, and gravel eroded from rocks and sediment on land, transported by streams, and deposited in marine deltas and basins. Mostly siliceous in composition. GeMS Dolomite Carbonate sedimentary rock, consisting chiefly of dolomite. Although dolostone is the proper analog to limestone, it has not often been applied to dolomitic units. GeMS Lacustrine sediment, mostly fine-grained Mostly well-sorted and well-bedded material, generally silt and clay sized, with lesser amounts of sand, deposited in perennial to intermittent lakes. GeMS Coal and lignite Organic-rich sedimentary rock, formed from compaction and alteration of plant remains. Coal is consolidated, harder, black rock. Lignite is semiconsolidated, brown to black, earthy material that may contain large particles of recognizable plant parts and tends to crack upon drying. GeMS Slate and phyllite, of sedimentary-rock origin Fine-grained rock derived from preexisting sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Includes phyllite and slate (compact, fine-grained rock that possesses strong cleavage and, hence, can be split into slabs and thin plates). Mostly formed from fine-grained material such as mudstone. GeMS Coastal zone sediment, mostly fine-grained Mostly clay and silt, deposited in lagoons, tidal flats, backbarriers, and coastal marshes. GeMS Sand and gravel of unspecified origin Sediment composed mostly of sand and (or) gravel, formed by weathering and erosion of preexisting rocks or minerals; eroded particles or clasts are transported and deposited by gravity, air, water, or ice. GeMS Sedimentary material An aggregation of particles deposited by gravity, air, water, or ice, or as accumulated by other natural agents operating at Earths surface such as chemical precipitation or secretion by organisms. May include unconsolidated material (sediment) and (or) sedimentary rock. Does not include sedimentary material directly deposited as a result of volcanic activity. GeMS Loess Silty sediment, deposited by wind, commonly near glacial margin. GeMS Conglomerate Sedimentary rock, composed predominantly of particles or clasts derived by erosion and weathering of preexisting rock; contains more than 30 percent gravel-sized clasts. GeMS Mostly mudstone Mostly mudstone, interbedded with other sedimentary rocks that locally may include coarser grained clastic rocks (sandstone, conglomerate), carbonates, and (or) coal. GeMS Alluvial sediment, mostly fine-grained Unconsolidated material deposited by streams or other bodies of running water as sorted or semisorted sediment in streambed, or on its floodplain or delta, or as cone or fan at base of mountain slope. Sediment is mostly silt and clay but may also contain some sand and gravel. GeMS Intermediate-composition pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. Parental magma commonly erupts from stratovolcanoes as thick lava flows but also can generate strong explosive eruptions to form pyroclastic flows. Includes rocks that are, in color and mineral composition, intermediate between felsic and mafic rocks (for example, andesite). GeMS Limestone Carbonate sedimentary rock, consisting chiefly of calcite. GeMS Coarse-grained, intermediate-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Intermediate in color and in mineral composition (between felsic and mafic igneous rock). Includes dioritic rock. GeMS Dune sand Mostly sand-sized sediment, deposited by wind. Typically characterized by various dune landforms. GeMS Exotic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) below Earths surface that has exotic mineralogical, textural, or field setting characteristics. Typically dark colored with abundant phenocrysts. Includes kimberlite, lamprophyre, lamproite, and foiditic rocks. GeMS Marine sediment Mud and sand, deposited in various marine environments. May originate from erosion of rocks and sediment or may be derived from marine organisms (of carbonate or siliceous composition). GeMS Ultramafic intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed almost entirely of mafic minerals (for example, hypersthene, augite, olivine). GeMS Sedimentary rock Consolidated material (rock) composed of particles transported and deposited by gravity, air, water, or ice, or accumulated by other natural agents operating at Earths surface, such as chemical precipitation or secretion by organisms. Does not here include sedimentary material directly deposited as result of volcanic activity. GeMS Contact-metamorphic rock Altered rock that originated by local processes of thermal metamorphism, genetically related to intrusion and extrusion of magmas and taking place at or near contact with body of igneous rock. Metamorphic changes are effected by heat and fluids emanating from magma and by some deformation because of emplacement of igneous mass. GeMS Igneous rock Rock and fragmental material that solidified from molten or partly molten material (magma). GeMS Lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Composed generally of fine-grained, dark-colored rocks (for example, basalt), which tend to form extensive sheets that have generally low relief, except in vent areas where cinder cones or shield volcanoes may form. Includes basaltic shield volcanoes, which may become very large (for example, Hawaii). GeMS Mafic-composition pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. Because of their low silica content and resulting low viscosity, parental magmas tend to erupt gently as lava flows rather than more forcefully as pyroclastic flows. Includes basalt; rocks are commonly dark-colored. GeMS Silt and clay of unspecified origin Sediment composed mostly of silt and (or) clay, formed by weathering and erosion of preexisting rocks or minerals; eroded particles or clasts are transported and deposited by gravity, air, water, or ice. GeMS Marine sediment, mostly fine-grained Mostly clay- and silt-sized sediment, deposited in relatively deep, quiet water, far removed from areas where coarser grained clastic sediments are washed into marine environment. Includes sediment derived from marine organisms. GeMS Evaporitic rock Sedimentary rock, composed primarily of minerals produced by evaporation of saline solution. Examples include gypsum, anhydrite, other diverse sulfates, halite (rock salt), primary dolomite, and rocks composed of various nitrates and borates. GeMS Glacial till Mostly unsorted and unstratified material, generally unconsolidated, deposited directly by and underneath or adjacent to glacier without subsequent reworking by meltwater. Consists of heterogeneous mixture of clay, silt, sand, gravel, and boulders, ranging widely in size and shape. GeMS Quartzite Rock derived from preexisting quartz-rich sedimentary rocks (commonly sandstone) and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, shear stress, and (or) chemical environment, generally at depth in Earths crust. GeMS Intrusive igneous rock Rock that solidified from molten or partly molten material (magma) below Earths surface. GeMS Metamorphic rock Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. GeMS Volcaniclastic (fragmental) material Rock and unconsolidated material consisting of particles or clasts that were formed by volcanic explosion or aerial expulsion from volcanic vent. GeMS Mafic-composition lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Low-silica parental magmas have low viscosity and tend to form extensive sheets that have generally low relief. Includes basaltic shield volcanoes, which may become very large (for example, in Hawaii). Composed of fine-grained, dark rocks, including basaltic. GeMS Colluvium and other widespread mass-movement sediment Sediment formed by slow, relatively widespread, downslope transport of particles or clasts produced by weathering and breakdown of underlying rock, sediment, and (or) soil. Composed of poorly sorted and poorly stratified material that ranges in size from clay to boulders. GeMS Sandstone Sedimentary rock, composed predominantly of particles or clasts derived by erosion and weathering of preexisting rock; consists mostly of sand-sized particles, with or without fine-grained matrix of silt or clay. GeMS Fine-grained intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. GeMS Sediment Unconsolidated material (sediment) composed of particles deposited by gravity, air, water, or ice, or as accumulated by other natural agents operating at Earths surface such as chemical precipitation or secretion by organisms. Does not include sedimentary material directly deposited as a result of volcanic activity. GeMS Deformation-related metamorphic rock Rock derived from preexisting rocks by essentially solid-state mineralogical, chemical, or structural changes in response to strong deformation, commonly in association with marked changes in temperature, pressure, and (or) chemical environment. Generally forms in narrow, planar zones of local deformation (for example, along faults); characterized by foliation or alignment of mineral grains. Includes mylonite and cataclasite. GeMS Iron-rich sedimentary rock Sedimentary rock, in which at least half (by volume) of observed minerals are iron bearing (hematite, magnetite, limonite group minerals, siderite, iron sulfides). GeMS Felsic-composition lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Because of their high silica content and resulting high viscosity, parental magmas tend to erupt explosively, and so these deposits are uncommon. Includes fine-grained, light-colored rock with rhyolitic, dacitic, trachytic, and latitic composition. GeMS Sandstone and mudstone Sandstone and mudstone (including shale and siltstone), in approximately equal (or unspecified) proportions. GeMS Intermediate-composition air-fall tephra Fragments of volcanic rock and lava, of various sizes, carried into the air by explosions and by hot gases in eruption columns or lava fountains; known as tephra. As tephra falls to ground, with increasing distance from volcano, average size of individual rock particles and thickness of resulting deposit decrease. Parental magma commonly erupts from stratovolcanoes as thick lava flows but also can generate strong explosive eruptions to form pyroclastic flows. Includes rocks that are, in color and mineral composition, intermediate between felsic and mafic rocks (for example, andesite). GeMS Residual material Unconsolidated material, developed in place by weathering of underlying rock or sediment. Usually forms relatively thin surface layer that conceals unweathered or partly altered source material. Material from which soils are formed. GeMS Mostly sandstone Mostly sandstone, interbedded with other sedimentary rocks that locally may include conglomerate and finer grained clastic rocks (mudstone), carbonates, and (or) coal. GeMS Clastic sediment Sediment formed by weathering and erosion of preexisting rocks or minerals; eroded particles or clasts are transported and deposited by gravity, air, water, or ice. GeMS Water or ice Water or ice GeMS Ice-contact and ice-marginal sediment Mostly sand-, silt-, and gravel-sized particles or clasts derived from rock or preexisting sediment that has been eroded and transported by glaciers. As glacier melted, material was deposited by running water essentially in contact with glacial ice or was transported and deposited by glacially fed streams. Includes sediment deposited into water bodies adjacent to glacier. GeMS Felsic-composition pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano or caldera. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. Because of their high-silica content and resulting high viscosity, parental magmas tend to erupt explosively. Includes rhyolite, dacite, trachyte, latite; rocks are commonly light-colored. GeMS Fine-grained, intermediate-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. Intermediate in color and in mineral composition (between felsic and mafic igneous rock). Includes andesitic rock. GeMS Mostly carbonate rock Mostly carbonate rock, interbedded with other sedimentary rock types. GeMS Regional metamorphic rock, of unspecified origin Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked regional changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Origin of preexisting rock is mixed (for example, igneous and sedimentary) or is not known. GeMS Mudstone Sedimentary rock, composed predominantly of particles or clasts derived by erosion and weathering of preexisting rock; consists mostly of mud (that is, silt- and clay-sized particles). Includes shale and siltstone. GeMS Lower-grade metamorphic rock, of unspecified origin Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to relatively mild regional changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Origin of preexisting rock is mixed (for example, igneous and sedimentary) or is not known. Includes slate and phyllite. GeMS Carbonate sediment Sediment formed by biotic or abiotic precipitation from aqueous solution of carbonates of calcium, magnesium, or iron (for example, limestone, dolomite). GeMS Fine-grained, felsic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. Composed mostly of light-colored minerals. Includes rhyolitic, dacitic, trachytic, and latitic rock. GeMS Rock Various rock types, not differentiated. GeMS Meta-carbonate rock Rock derived from preexisting carbonate sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Characterized by recrystallization of carbonate minerals in source rock. Includes marble (for which preexisting rock was dominantly limestone or other rock composed of calcite), dolomitic marble, meta-dolostone, and meta-dolomite (for which preexisting rock contained appreciable amount of magnesium). GeMS Peat and muck Unconsolidated material, principally composed of plant remains, with lesser amounts of fine-grained clastic sediment. Deposited in water-saturated environment such as swamp, marsh, or bog. With lithification, such material becomes coal. GeMS Felsic-composition air-fall tephra Fragments of volcanic rock and lava, of various sizes, carried into air by explosions and by hot gases in eruption columns or lava fountains; known as tephra. As tephra falls to ground, with increasing distance from volcano, average size of individual rock particles and thickness of resulting deposit decrease. Because of their high silica content and resulting high viscosity, felsic-composition magmas tend to erupt explosively, readily forming pumice and volcanic ash. Composed of light-colored rocks (for example, rhyolite, dacite, trachyte, latite). GeMS Schist and gneiss, of sedimentary-rock origin Foliated rock derived from preexisting sedimentary rocks by essentially solid-state mineralogical, chemical, or structural changes in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Includes schist (characterized by such strong foliation or alignment of minerals that it readily splits into flakes or slabs) and gneiss (characterized by alternating, irregular bands of different mineral composition). Mostly formed from fine-grained material such as mudstone. GeMS Coarse-grained, mafic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed mostly of feldspar and dark-colored minerals. Includes gabbroic rock. GeMS Clastic sedimentary rock Sedimentary rock, composed predominantly of particles or clasts derived by erosion, weathering, or mass-wasting of preexisting rock and deposited by gravity, air, water, or ice. GeMS Volcanic mass flow Volcanic deposits formed by mass movement (for example, debris avalanches, debris flows, lahar deposits), in many cases triggered by volcanic eruption. Debris avalanches that occur on volcanoes clearly without eruptive trigger may be classified as sedimentary (for example, as Debris flows, landslides, and other localized mass-movement sediment). GeMS Coarse-grained, felsic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed mostly of light-colored minerals (for example, feldspar, quartz). Includes granitic, syenitic, and monzonitic rock. GeMS Meta-mafic rock Rock derived from preexisting mafic rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed mostly of iron- and magnesium-bearing, dark-colored and (or) green minerals. Includes greenstone, amphibolite, and metagabbro. GeMS Lacustrine sediment Mostly well-sorted and well-bedded material that ranges in grain size from clay to gravel, deposited in perennial to intermittent lakes. Much of sediment is derived from material eroded and transported by streams. Includes deposits of lake-marginal beaches and deltas. GeMS Fine-grained, mafic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. Composed mostly of dark-colored minerals. Includes basaltic rock. GeMS Ice-contact and ice-marginal sediment, mostly coarse-grained Mostly sand- and gravel-sized particles or clasts, with lesser amounts of silt and clay, derived from rock or preexisting sediment that has been eroded and transported by glaciers. As glacier melted, material was deposited by running water essentially in contact with glacial ice or was transported and deposited by glacially fed streams. Includes sediment deposited into water bodies adjacent to glacier. GeMS Extrusive igneous material Molten material that was erupted onto Earths surface, fusing into rock or remaining as unconsolidated particles. Includes pyroclastic flows, air-fall tephra, lava flows, and volcanic mass flows. GeMS GeoMaterialConfidence Describes appropriateness of GeoMaterial term for describing the map unit. GeMS Low Either (1) the overall lithologic nature of rocks and (or) sediments in this map unit is not adequately classifiable using the available list of GeoMaterial terms (and their definitions), but the selected term is the best available, or (2) this map unit is not sufficiently known enough to confidently assign a GeoMaterial term. U.S. Geological Survey, 2020, GeMS (Geologic Map Schema)--A Standard Format for the Digital Publication of Geologic Maps: U.S. Geological Survey Techniques and Methods 11-B10. High The selected term in the GeoMaterial field (and its definition) adequately characterizes the overall lithologic nature of rocks and (or) sediments in the map unit. U.S. Geological Survey, 2020, GeMS (Geologic Map Schema)--A Standard Format for the Digital Publication of Geologic Maps: U.S. Geological Survey Techniques and Methods 11-B10. Medium The selected term in the GeoMaterial field (and its definition) generally characterizes the overall lithologic nature of rocks and (or) sediments in the map unit, but one or more significant but minor lithologies are not adequately described by the selected term. U.S. Geological Survey, 2020, GeMS (Geologic Map Schema)--A Standard Format for the Digital Publication of Geologic Maps: U.S. Geological Survey Techniques and Methods 11-B10. Source_DescriptionOfMapUnits_ID Primary key on the Source_DescriptionOfMapUnits table. This Report Unrepresentable domain Synthesis_to_Source_Units Table defining relationships between "source map units" and synthesis "map units". This Report OBJECTID Internal feature number ESRI Unrepresentable domain MapSourceID Identifies source map. Foreign key to DataSources table. This Report Unrepresentable domain Source_DescriptionOfMapUnitsID Foreign key to DescriptionOfMapUnits table. This Report Unrepresentable domain Source_MapUnit Short, easily understood ASCII-character identifier for the source map unit. Prefixed with a MapSourceID value (from Source_DescriptionOfMapUnits) to differentiate identically-named source map units from different source maps. Otherwise conceptually equivalent to the "MapUnit" field in the GeMS "DescriptionOfMapUnits" table. This Report Unrepresentable domain DescriptionOfMapUnitsID Foreign key to DescriptionOfMapUnits table. This Report Unrepresentable domain MapUnit Short plain-text identifier of the map unit. Foreign key to DescriptionOfMapUnits table. GeMS Ygg Granitic rocks This Report pC Undifferentiated Precambrian rocks This Report Aum Ultramafic rocks This Report Ai Intrusive rocks This Report PZpCm Metamorphic rocks This Report Zu Undifferentiated Neoproterozoic rocks This Report PZpCu Undifferentiated Paleozoic to Precambrian rocks This Report Ymc Carbonate and meta-carbonate rocks This Report Zm Metamorphic and igneous rocks This Report Xu Undifferentiated Paleoproterozoic rocks This Report Ymss Clastic sedimentary rocks This Report Au Undifferentiated Archean rocks This Report Xif Iron formation This Report Aig Granitic rocks This Report Yms Sedimentary and metasedimentary rocks This Report Ymg Mafic intrusive rocks This Report PRu Undifferentiated Proterozoic rocks This Report Xim Gabbro and mafic lava flows This Report CAZms Metasedimentary rocks This Report water Water and ice This Report Xmsq Quartzite This Report Zg Granitic rocks This Report af Artificial fill This Report Xi Igneous and metaigneous rocks This Report unmapped Unmapped areas This Report Yl Igneous rocks This Report PHs Phanerozoic cover rocks This Report Zms Metasedimentary rocks This Report PZpCg Igneous rocks This Report Ams Metasedimentary rocks This Report PZpCms Metasedimentary rocks This Report Xig Granitic rocks This Report Zmg Metaigneous rocks This Report scz Shear zone rocks This Report Yu Undifferentiated Mesoproterozoic rocks This Report PRum Ultramafic rocks This Report Xms Metasedimentary rocks This Report PHi Phanerozoic igneous rocks This Report PZpCmg Metaigneous rocks This Report Xmss Slate and sandstone This Report PZpCum Ultramafic rocks This Report Aif Iron formation This Report Zs Clastic sedimentary rocks This Report Symbol_Lookup FGDC symbols used in the source maps referenced herein. This Report OBJECTID Internal feature number ESRI Unrepresentable domain Symbol_Lookup_ID Primary key on the Symbol_Lookup table. This Report Unrepresentable domain Symbol Reference to a point marker, line symbol, or area-fill symbol that is used on the map graphic to denote the feature: perhaps a star for a K-Ar age locality, or a heavy black line for a fault. GeMS Unrepresentable domain IsConcealed Flag for contacts and faults covered by overlying map unit. GeMS Unrepresentable domain LocationConfidenceMeters Estimated half-width in meters of positional uncertainty envelope; position is relative to other features in database. GeMS Positive real number. Value of -9, -99, or -999 indicates value is unknown. Type Classifier that specifies what kind of geologic feature is represented by a database element: that a certain line within feature class ContactsAndFaults is a contact, or thrust fault, or water boundary; or that a point in GeochronPoints represents a K-Ar date. GeMS reverse fault A fault on which the hanging wall has moved upward relative to the footwall. The dip of the fault is usually greater than 45°. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. caldera margin [The margin of] a large, basin-shaped volcanic depression, more or less circular or cirquelike in form, the diameter of which is many times greater than that of the included vent or vents, no matter what the steepness of the walls or form of the floor (Williams, 1941). It is formed by collapse during an eruption. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. shoreline A line delineating the boundary of a body of water, such as a river, lake, or the ocean This Report internal contact A planar or irregular surface separating different portions of the same geologic map unit, such as individual landslide blocks with a mapped landslide, or separately emplaced portions of a composite plutonic unit. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. strike-slip fault, right lateral offset A strike-slip fault on which the side opposite the observer has been displaced to the right. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. thrust fault A fault with a dip of 45° or less over much of its extent, on which the hanging wall has moved upward relative to the footwall. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. gradational contact A contact defined by a gradual or continuous lithologic change from one geologic map unit to another. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. contact A plane or irregular surface between two types or ages of rock. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. oblique-slip fault, left lateral offset A fault on which the net slip has dip slip and strike slip components, and the side opposite the observer has been displaced to the left. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. normal fault A fault in which the hanging wall has moved downward relative to the footwall. The angle of the fault is usually 45-90 degrees, and in most cases close to 60 degrees. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. overturned thrust fault A fault with an original dip of 45° or less over much of its extent, on which the hanging wall has moved upward relative to the footwall, that has subsequently been rotated beyond perpendicular so that the primary hanging wall and footwall positioning have been reversed. This Report shear zone A discrete, parallel-sided zone of localized shearing displacement, which may be recognized by sigmoidal mineral-filled veins, locally well-developed cleavage or foliation, wholesale grain-size reduction or mylonitization, or some combination of these features. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. detachment fault A regionally extensive, gently dipping normal fault that is commonly associated with extension in a metamorphic core complex. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. glacial terminus The lower margin or extremity of a glacier, referring to the maximum extent (limit) reached by the glacier. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. strike-slip fault, left lateral offset A strike-slip fault on which the side opposite the observer has been displaced to the left. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. scratch boundary Arbitrary, non-physical boundary between map units on a geologic map. For example, between an undivided unit and its subunits, or between different names for the same package of rocks. This Report lineament A linear feature that has been determined from aerial photographs or remotely sensed data but not identified on the ground. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. key bed A well-defined, easily identifiable stratum or body of strata that has sufficiently distinctive characteristics (such as lithology or fossil content) to facilitate correlation in field mapping or subsurface work. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. fault A discrete surface or zone of discrete surfaces separating two rock masses across which one mass has slid past the other. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. listric fault A curved downward-flattening fault, generally concave upward. Listric faults may be characterized by normal or reverse separation, but the term is used most frequently in normal faulting and is often a characteristic of growth faults. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. low-angle normal fault A fault in which the hanging wall has moved downward relative to the footwall. The angle of the fault is less than 45 degrees. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. oblique-slip fault, right lateral offset A fault on which the net slip has dip slip and strike slip components, and the side opposite the observer has been displaced to the right. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. map boundary The boundary of the map. In a GIS database, the line that bounds the outer extent of the polygons. This Report SymbolClass Short description of which class of vector features this symbol applies to; line, point, or fill. This Report Unrepresentable domain ExistenceConfidence Confidence that feature exists. GeMS questionable Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = questionable is appropriate when a geologist reasons "I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault." Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. IdentityConfidence Confidence that feature is correctly identified. GeMS questionable Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = questionable is appropriate when a geologist reasons "I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault." Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. Notes Additional information specific to a particular feature or table entry. GeMS Unrepresentable domain. Free text. Values of <null> or #null indicate no entry. GeoMaterialDict Non-spatial table that provides values of GeoMaterial, placed in a hierarchy, and their definitions. For further information, see Appendix A in GeMS documentation, available at http://ngmdb.usgs.gov/Info/standards/GeMS. GeMS OBJECTID Internal feature number ESRI Unrepresentable domain HierarchyKey String that records hierarchical structure. Has form nn-nn-nn, nnn-nnn, or similar. Numeric, left-padded with zeros, dash-delimited. Each HierarchyKey fragment of each row MUST be the same length to allow text-based sorting of table entries. GeMS Unrepresentable domain GeoMaterial Categorization of map unit based on lithologic and genetic character, term selected from NGMDB standard term list defined in Appendix A of GeMS documentation, available at http://ngmdb.usgs.gov/Info/standards/GeMS.. GeMS Eolian sediment Silt- and sand-sized sediment, deposited by wind. GeMS Coastal zone sediment Mud and sand, with lesser amounts of gravel, deposited on beaches, on barrier islands, or in nearshore-marine, deltaic, or various low-energy shoreline (mud flat, tidal flat, sabka, algal flat) environments. GeMS Metasedimentary rock Rock derived from preexisting sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. GeMS Chert Sedimentary rock, composed chiefly of microcrystalline or cryptocrystalline quartz. GeMS Coastal zone sediment, mostly coarse-grained Mostly sand, silt, and gravel, deposited on beaches, in dunes, and in shallow-marine and related alluvial environments. GeMS Igneous and metamorphic rock Consists of coarse-grained intrusive igneous rock and generally medium- to high-grade metamorphic rock. GeMS Meta-ultramafic rock Rock derived from preexisting ultramafic rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed mostly of magnesium-bearing minerals (for example, serpentine, talc, magnesite). GeMS Debris flows, landslides, and other localized mass-movement sediment Sediment formed by relatively localized, downslope transport of particles or clasts produced by weathering and breakdown of underlying rock, sediment, and (or) soil. Composed of poorly sorted and poorly stratified material that ranges in size from clay to boulders. Speed of downslope transport ranges from rapid to imperceptible. GeMS Lacustrine sediment, mostly coarse-grained Mostly well-sorted and well-bedded material, generally sand and gravel sized, with lesser amounts of silt and clay, deposited in perennial to intermittent lakes. Much of sediment is derived from material eroded and transported by streams. Mostly deposits of lake-marginal beaches and deltas. GeMS Medium and high-grade regional metamorphic rock, of unspecified origin Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to relatively intense regional changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Origin of preexisting rock is mixed (for example, igneous and sedimentary) or is not known. Includes amphibolite, granulite, schist, and gneiss. GeMS Alluvial sediment Unconsolidated material deposited by streams or other bodies of running water as sorted or semisorted sediment in streambed, or on its floodplain or delta, or as cone or fan at base of mountain slope. Grain size varies from clay to gravel. GeMS Meta-volcaniclastic rock Rock derived from preexisting volcaniclastic rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed of deformed but recognizable particles or clasts of volcanic explosive material. GeMS Intermediate-composition lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Parental magma commonly erupts from stratovolcanoes as thick lava flows. Includes rocks that are, in color and in mineral composition, intermediate between felsic and mafic rocks (for example, andesite). GeMS Pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano or caldera. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. GeMS Carbonate rock Sedimentary rock, consisting chiefly of carbonate minerals such as limestone or dolomite. GeMS "Made" or human-engineered land Modern, unconsolidated material known to have human-related origin. GeMS Playa sediment Fine-grained clastic sediment and evaporitic salts, deposited in ephemeral lakes in centers of undrained basins. Includes material deposited in playas, mud flats, salt flats, and adjacent saline marshes. Generally interbedded with eolian sand and with lacustrine sediment deposited during wetter climatic periods; commonly intertongues upslope with sediment deposited by alluvial fans. GeMS Unmapped area Unmapped area GeMS Alluvial sediment, mostly coarse-grained Unconsolidated material deposited by streams or other bodies of running water as sorted or semisorted sediment in streambed, or on its floodplain or delta, or as cone or fan at base of mountain slope. Sediment is mostly sand, gravel, and coarser material but may also contain some silt and clay. GeMS Sedimentary and extrusive igneous material Either (1) sedimentary rock and (or) unconsolidated material (sediment) and extrusive igneous material (volcanic rock and [or] sediment) or (2) volcanic rock and (or) sediment and such material after erosion and redeposition. GeMS Metaigneous rock Rock derived from preexisting igneous rocks and altered by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, shear stress, and (or) chemical environment, generally at depth in Earths crust. GeMS Coarse-grained intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. GeMS Meta-felsic and intermediate rock Rock derived from preexisting felsic and intermediate-composition rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed mostly of light-colored minerals; relatively enriched in silica. Includes metagranite, metadiorite, and meta-andesite. GeMS Marine sediment, mostly coarse-grained Mud, sand, and gravel eroded from rocks and sediment on land, transported by streams, and deposited in marine deltas and basins. Mostly siliceous in composition. GeMS Dolomite Carbonate sedimentary rock, consisting chiefly of dolomite. Although dolostone is the proper analog to limestone, it has not often been applied to dolomitic units. GeMS Lacustrine sediment, mostly fine-grained Mostly well-sorted and well-bedded material, generally silt and clay sized, with lesser amounts of sand, deposited in perennial to intermittent lakes. GeMS Coal and lignite Organic-rich sedimentary rock, formed from compaction and alteration of plant remains. Coal is consolidated, harder, black rock. Lignite is semiconsolidated, brown to black, earthy material that may contain large particles of recognizable plant parts and tends to crack upon drying. GeMS Slate and phyllite, of sedimentary-rock origin Fine-grained rock derived from preexisting sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Includes phyllite and slate (compact, fine-grained rock that possesses strong cleavage and, hence, can be split into slabs and thin plates). Mostly formed from fine-grained material such as mudstone. GeMS Air-fall tephra Fragments of volcanic rock and lava, of various sizes, carried into air by explosions and by hot gases in eruption columns or lava fountains; known as tephra. As tephra falls to ground, with increasing distance from volcano, average size of individual rock particles and thickness of resulting deposit decrease. Fine tephra deposited at some distance from volcano is known as volcanic ash. GeMS Coastal zone sediment, mostly fine-grained Mostly clay and silt, deposited in lagoons, tidal flats, backbarriers, and coastal marshes. GeMS Sand and gravel of unspecified origin Sediment composed mostly of sand and (or) gravel, formed by weathering and erosion of preexisting rocks or minerals; eroded particles or clasts are transported and deposited by gravity, air, water, or ice. GeMS Sedimentary material An aggregation of particles deposited by gravity, air, water, or ice, or as accumulated by other natural agents operating at Earths surface such as chemical precipitation or secretion by organisms. May include unconsolidated material (sediment) and (or) sedimentary rock. Does not include sedimentary material directly deposited as a result of volcanic activity. GeMS Loess Silty sediment, deposited by wind, commonly near glacial margin. GeMS Conglomerate Sedimentary rock, composed predominantly of particles or clasts derived by erosion and weathering of preexisting rock; contains more than 30 percent gravel-sized clasts. GeMS Mostly mudstone Mostly mudstone, interbedded with other sedimentary rocks that locally may include coarser grained clastic rocks (sandstone, conglomerate), carbonates, and (or) coal. GeMS Alluvial sediment, mostly fine-grained Unconsolidated material deposited by streams or other bodies of running water as sorted or semisorted sediment in streambed, or on its floodplain or delta, or as cone or fan at base of mountain slope. Sediment is mostly silt and clay but may also contain some sand and gravel. GeMS Intermediate-composition pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. Parental magma commonly erupts from stratovolcanoes as thick lava flows but also can generate strong explosive eruptions to form pyroclastic flows. Includes rocks that are, in color and mineral composition, intermediate between felsic and mafic rocks (for example, andesite). GeMS Limestone Carbonate sedimentary rock, consisting chiefly of calcite. GeMS Coarse-grained, intermediate-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Intermediate in color and in mineral composition (between felsic and mafic igneous rock). Includes dioritic rock. GeMS Dune sand Mostly sand-sized sediment, deposited by wind. Typically characterized by various dune landforms. GeMS Exotic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) below Earths surface that has exotic mineralogical, textural, or field setting characteristics. Typically dark colored with abundant phenocrysts. Includes kimberlite, lamprophyre, lamproite, and foiditic rocks. GeMS Marine sediment Mud and sand, deposited in various marine environments. May originate from erosion of rocks and sediment or may be derived from marine organisms (of carbonate or siliceous composition). GeMS Ultramafic intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed almost entirely of mafic minerals (for example, hypersthene, augite, olivine). GeMS Sedimentary rock Consolidated material (rock) composed of particles transported and deposited by gravity, air, water, or ice, or accumulated by other natural agents operating at Earths surface, such as chemical precipitation or secretion by organisms. Does not here include sedimentary material directly deposited as result of volcanic activity. GeMS Contact-metamorphic rock Altered rock that originated by local processes of thermal metamorphism, genetically related to intrusion and extrusion of magmas and taking place at or near contact with body of igneous rock. Metamorphic changes are effected by heat and fluids emanating from magma and by some deformation because of emplacement of igneous mass. GeMS Igneous rock Rock and fragmental material that solidified from molten or partly molten material (magma). GeMS Lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Composed generally of fine-grained, dark-colored rocks (for example, basalt), which tend to form extensive sheets that have generally low relief, except in vent areas where cinder cones or shield volcanoes may form. Includes basaltic shield volcanoes, which may become very large (for example, Hawaii). GeMS Mafic-composition pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. Because of their low silica content and resulting low viscosity, parental magmas tend to erupt gently as lava flows rather than more forcefully as pyroclastic flows. Includes basalt; rocks are commonly dark-colored. GeMS Other materials Other materials GeMS Mass movement sediment Sediment formed by downslope transport of particles or clasts produced by weathering and breakdown of underlying rock, sediment, and (or) soil. Composed of poorly sorted and poorly stratified material that ranges in size from clay to boulders. Includes colluvial, landslide, talus, and rock-avalanche deposits. GeMS Silt and clay of unspecified origin Sediment composed mostly of silt and (or) clay, formed by weathering and erosion of preexisting rocks or minerals; eroded particles or clasts are transported and deposited by gravity, air, water, or ice. GeMS Marine sediment, mostly fine-grained Mostly clay- and silt-sized sediment, deposited in relatively deep, quiet water, far removed from areas where coarser grained clastic sediments are washed into marine environment. Includes sediment derived from marine organisms. GeMS Evaporitic rock Sedimentary rock, composed primarily of minerals produced by evaporation of saline solution. Examples include gypsum, anhydrite, other diverse sulfates, halite (rock salt), primary dolomite, and rocks composed of various nitrates and borates. GeMS Glacial till Mostly unsorted and unstratified material, generally unconsolidated, deposited directly by and underneath or adjacent to glacier without subsequent reworking by meltwater. Consists of heterogeneous mixture of clay, silt, sand, gravel, and boulders, ranging widely in size and shape. GeMS Quartzite Rock derived from preexisting quartz-rich sedimentary rocks (commonly sandstone) and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, shear stress, and (or) chemical environment, generally at depth in Earths crust. GeMS Intrusive igneous rock Rock that solidified from molten or partly molten material (magma) below Earths surface. GeMS Metamorphic rock Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. GeMS Volcaniclastic (fragmental) material Rock and unconsolidated material consisting of particles or clasts that were formed by volcanic explosion or aerial expulsion from volcanic vent. GeMS Mafic-composition lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Low-silica parental magmas have low viscosity and tend to form extensive sheets that have generally low relief. Includes basaltic shield volcanoes, which may become very large (for example, in Hawaii). Composed of fine-grained, dark rocks, including basaltic. GeMS Rock and sediment Various rocks and sediment, not differentiated. GeMS Colluvium and other widespread mass-movement sediment Sediment formed by slow, relatively widespread, downslope transport of particles or clasts produced by weathering and breakdown of underlying rock, sediment, and (or) soil. Composed of poorly sorted and poorly stratified material that ranges in size from clay to boulders. GeMS Sandstone Sedimentary rock, composed predominantly of particles or clasts derived by erosion and weathering of preexisting rock; consists mostly of sand-sized particles, with or without fine-grained matrix of silt or clay. GeMS Fine-grained intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. GeMS Ice-contact and ice-marginal sediment, mostly fine-grained Mostly silt- and clay-sized particles or clasts, with lesser amounts of sand and gravel, derived from rock or preexisting sediment that has been eroded and transported by glaciers. As glacier melted, material was deposited by running water essentially in contact with glacial ice or was transported and deposited by glacially fed streams. Includes sediment deposited into water bodies adjacent to glacier. GeMS Sediment Unconsolidated material (sediment) composed of particles deposited by gravity, air, water, or ice, or as accumulated by other natural agents operating at Earths surface such as chemical precipitation or secretion by organisms. Does not include sedimentary material directly deposited as a result of volcanic activity. GeMS Deformation-related metamorphic rock Rock derived from preexisting rocks by essentially solid-state mineralogical, chemical, or structural changes in response to strong deformation, commonly in association with marked changes in temperature, pressure, and (or) chemical environment. Generally forms in narrow, planar zones of local deformation (for example, along faults); characterized by foliation or alignment of mineral grains. Includes mylonite and cataclasite. GeMS Iron-rich sedimentary rock Sedimentary rock, in which at least half (by volume) of observed minerals are iron bearing (hematite, magnetite, limonite group minerals, siderite, iron sulfides). GeMS Felsic-composition lava flows Lateral, surficial outpourings of molten lava from vent or fissure; also, solidified bodies of rock that form when they cool. Because of their high silica content and resulting high viscosity, parental magmas tend to erupt explosively, and so these deposits are uncommon. Includes fine-grained, light-colored rock with rhyolitic, dacitic, trachytic, and latitic composition. GeMS Sandstone and mudstone Sandstone and mudstone (including shale and siltstone), in approximately equal (or unspecified) proportions. GeMS Mafic-composition air-fall tephra Fragments of volcanic rock and lava, of various sizes, carried into the air by explosions and by hot gases in eruption columns or lava fountains; known as tephra. As tephra falls to ground, with increasing distance from volcano, average size of individual rock particles and thickness of resulting deposit decrease. Because of their low silica content and resulting low viscosity, parental magmas tend to erupt gently as lava flows, and so these deposits are uncommon. Includes basalt; rocks are commonly dark-colored. GeMS Intermediate-composition air-fall tephra Fragments of volcanic rock and lava, of various sizes, carried into the air by explosions and by hot gases in eruption columns or lava fountains; known as tephra. As tephra falls to ground, with increasing distance from volcano, average size of individual rock particles and thickness of resulting deposit decrease. Parental magma commonly erupts from stratovolcanoes as thick lava flows but also can generate strong explosive eruptions to form pyroclastic flows. Includes rocks that are, in color and mineral composition, intermediate between felsic and mafic rocks (for example, andesite). GeMS Residual material Unconsolidated material, developed in place by weathering of underlying rock or sediment. Usually forms relatively thin surface layer that conceals unweathered or partly altered source material. Material from which soils are formed. GeMS Mostly sandstone Mostly sandstone, interbedded with other sedimentary rocks that locally may include conglomerate and finer grained clastic rocks (mudstone), carbonates, and (or) coal. GeMS Clastic sediment Sediment formed by weathering and erosion of preexisting rocks or minerals; eroded particles or clasts are transported and deposited by gravity, air, water, or ice. GeMS Water or ice Water or ice GeMS Ice-contact and ice-marginal sediment Mostly sand-, silt-, and gravel-sized particles or clasts derived from rock or preexisting sediment that has been eroded and transported by glaciers. As glacier melted, material was deposited by running water essentially in contact with glacial ice or was transported and deposited by glacially fed streams. Includes sediment deposited into water bodies adjacent to glacier. GeMS Felsic-composition pyroclastic flows Hot ash, pumice, and rock fragments erupted from volcano or caldera. Material moves downslope commonly in chaotic flows; once deposited, hot fragments may compact under their own weight and weld together. Because of their high-silica content and resulting high viscosity, parental magmas tend to erupt explosively. Includes rhyolite, dacite, trachyte, latite; rocks are commonly light-colored. GeMS Fine-grained, intermediate-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. Intermediate in color and in mineral composition (between felsic and mafic igneous rock). Includes andesitic rock. GeMS Mostly carbonate rock Mostly carbonate rock, interbedded with other sedimentary rock types. GeMS Regional metamorphic rock, of unspecified origin Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked regional changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Origin of preexisting rock is mixed (for example, igneous and sedimentary) or is not known. GeMS Glacial till, mostly silty Mostly unsorted and unstratified material, generally unconsolidated, deposited directly by and underneath or adjacent to glacier without subsequent reworking by meltwater. Consists of heterogeneous mixture of clay, silt, sand, gravel, and boulders, ranging widely in size and shape. Relatively loamy (silty) in texture. GeMS Mudstone Sedimentary rock, composed predominantly of particles or clasts derived by erosion and weathering of preexisting rock; consists mostly of mud (that is, silt- and clay-sized particles). Includes shale and siltstone. GeMS Lower-grade metamorphic rock, of unspecified origin Rock derived from preexisting rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to relatively mild regional changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Origin of preexisting rock is mixed (for example, igneous and sedimentary) or is not known. Includes slate and phyllite. GeMS Carbonate sediment Sediment formed by biotic or abiotic precipitation from aqueous solution of carbonates of calcium, magnesium, or iron (for example, limestone, dolomite). GeMS Fine-grained, felsic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. Composed mostly of light-colored minerals. Includes rhyolitic, dacitic, trachytic, and latitic rock. GeMS Rock Various rock types, not differentiated. GeMS Meta-carbonate rock Rock derived from preexisting carbonate sedimentary rocks and altered by essentially solid-state mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Characterized by recrystallization of carbonate minerals in source rock. Includes marble (for which preexisting rock was dominantly limestone or other rock composed of calcite), dolomitic marble, meta-dolostone, and meta-dolomite (for which preexisting rock contained appreciable amount of magnesium). GeMS Peat and muck Unconsolidated material, principally composed of plant remains, with lesser amounts of fine-grained clastic sediment. Deposited in water-saturated environment such as swamp, marsh, or bog. With lithification, such material becomes coal. GeMS Felsic-composition air-fall tephra Fragments of volcanic rock and lava, of various sizes, carried into air by explosions and by hot gases in eruption columns or lava fountains; known as tephra. As tephra falls to ground, with increasing distance from volcano, average size of individual rock particles and thickness of resulting deposit decrease. Because of their high silica content and resulting high viscosity, felsic-composition magmas tend to erupt explosively, readily forming pumice and volcanic ash. Composed of light-colored rocks (for example, rhyolite, dacite, trachyte, latite). GeMS Schist and gneiss, of sedimentary-rock origin Foliated rock derived from preexisting sedimentary rocks by essentially solid-state mineralogical, chemical, or structural changes in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Includes schist (characterized by such strong foliation or alignment of minerals that it readily splits into flakes or slabs) and gneiss (characterized by alternating, irregular bands of different mineral composition). Mostly formed from fine-grained material such as mudstone. GeMS Glacial till, mostly clayey Mostly unsorted and unstratified material, generally unconsolidated, deposited directly by and underneath or adjacent to glacier without subsequent reworking by meltwater. Consists of heterogeneous mixture of clay, silt, sand, gravel, and boulders, ranging widely in size and shape. Relatively clayey in texture. GeMS Coarse-grained, mafic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed mostly of feldspar and dark-colored minerals. Includes gabbroic rock. GeMS Clastic sedimentary rock Sedimentary rock, composed predominantly of particles or clasts derived by erosion, weathering, or mass-wasting of preexisting rock and deposited by gravity, air, water, or ice. GeMS Volcanic mass flow Volcanic deposits formed by mass movement (for example, debris avalanches, debris flows, lahar deposits), in many cases triggered by volcanic eruption. Debris avalanches that occur on volcanoes clearly without eruptive trigger may be classified as sedimentary (for example, as Debris flows, landslides, and other localized mass-movement sediment). GeMS Coarse-grained, felsic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at some depth beneath Earths surface, thereby cooling slowly enough for mineral crystals to grow large enough to be visible to naked eye. Composed mostly of light-colored minerals (for example, feldspar, quartz). Includes granitic, syenitic, and monzonitic rock. GeMS Meta-mafic rock Rock derived from preexisting mafic rocks by essentially solid-state, mineralogical, chemical, or structural changes, in response to marked changes in temperature, pressure, deformation, and (or) chemical environment, generally at depth in Earths crust. Composed mostly of iron- and magnesium-bearing, dark-colored and (or) green minerals. Includes greenstone, amphibolite, and metagabbro. GeMS Lacustrine sediment Mostly well-sorted and well-bedded material that ranges in grain size from clay to gravel, deposited in perennial to intermittent lakes. Much of sediment is derived from material eroded and transported by streams. Includes deposits of lake-marginal beaches and deltas. GeMS Glacial till, mostly sandy Mostly unsorted and unstratified material, generally unconsolidated, deposited directly by and underneath or adjacent to glacier without subsequent reworking by meltwater. Consists of heterogeneous mixture of clay, silt, sand, gravel, and boulders, ranging widely in size and shape. Relatively sandy in texture. GeMS Fine-grained, mafic-composition intrusive igneous rock Rock that solidified from molten or partly molten material (magma) at shallow depth beneath Earths surface, thereby cooling quickly. Generally fine grained but may contain large mineral crystals (phenocrysts). Mostly found as tabular dikes or sills. Composed mostly of dark-colored minerals. Includes basaltic rock. GeMS Ice-contact and ice-marginal sediment, mostly coarse-grained Mostly sand- and gravel-sized particles or clasts, with lesser amounts of silt and clay, derived from rock or preexisting sediment that has been eroded and transported by glaciers. As glacier melted, material was deposited by running water essentially in contact with glacial ice or was transported and deposited by glacially fed streams. Includes sediment deposited into water bodies adjacent to glacier. GeMS Extrusive igneous material Molten material that was erupted onto Earths surface, fusing into rock or remaining as unconsolidated particles. Includes pyroclastic flows, air-fall tephra, lava flows, and volcanic mass flows. GeMS IndentedName Name with addition of leading spaces to help show rank within a hierarchical list. GeMS Unrepresentable domain Definition Plain-language definition. GeMS Unrepresentable domain MapUnitPolys Polygons that record distribution of map units (including water, snowfields, glaciers, and unmapped area) on the particular map horizon. In the original file geodatabase, this dataset is found within the GeologicMap feature dataset. GeMS OBJECTID Internal feature number ESRI Unrepresentable domain Shape Internal geometry object ESRI Unrepresentable domain Shape_Length Internal feature length, double ESRI Unrepresentable domain Shape_Area Internal feature area, double ESRI Unrepresentable domain MapUnit Short plain-text identifier of the map unit. Foreign key to DescriptionOfMapUnits table. GeMS Ygg Granitic rocks This Report pC Undifferentiated Precambrian rocks This Report Aum Ultramafic rocks This Report Ai Intrusive rocks This Report PZpCm Metamorphic rocks This Report Ymc Carbonate and meta-carbonate rocks This Report PZpCu Undifferentiated Paleozoic to Precambrian rocks This Report Zu Undifferentiated Neoproterozoic rocks This Report Zm Metamorphic and igneous rocks This Report Xu Undifferentiated Paleoproterozoic rocks This Report Ymss Clastic sedimentary rocks This Report Au Undifferentiated Archean rocks This Report Xif Iron formation This Report Aig Granitic rocks This Report Yms Sedimentary and metasedimentary rocks This Report Ymg Mafic intrusive rocks This Report Xim Gabbro and mafic lava flows This Report PRu Undifferentiated Proterozoic rocks This Report CAZms Metasedimentary rocks This Report water Water and ice This Report Xmsq Quartzite This Report Zg Granitic rocks This Report af Artificial fill This Report Xi Igneous and metaigneous rocks This Report unmapped Unmapped areas This Report Yl Igneous rocks This Report PHs Phanerozoic cover rocks This Report Zms Metasedimentary rocks This Report PZpCg Igneous rocks This Report Ams Metasedimentary rocks This Report PZpCms Metasedimentary rocks This Report scz Shear zone rocks This Report Zmg Metaigneous rocks This Report Xig Granitic rocks This Report Yu Undifferentiated Mesoproterozoic rocks This Report PRum Ultramafic rocks This Report Xms Metasedimentary rocks This Report PHi Phanerozoic igneous rocks This Report PZpCmg Metaigneous rocks This Report Xmss Slate and sandstone This Report PZpCum Ultramafic rocks This Report Aif Iron formation This Report Zs Clastic sedimentary rocks This Report IdentityConfidence Confidence that feature is correctly identified. GeMS questionable Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = questionable is appropriate when a geologist reasons "I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault." Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. Label Plain-text equivalent of the desired annotation for a feature: for example "14 Ma", or "^c" which (when used with the FGDC GeoAge font) results in the geologic map-unit label TRc (with TR run together to make the Triassic symbol). GeMS Unrepresentable domain Symbol Reference to a point marker, line symbol, or area-fill symbol that is used on the map graphic to denote the feature: perhaps a star for a K-Ar age locality, or a heavy black line for a fault. GeMS Unrepresentable domain DataSourceID Source of data; foreign key to table DataSources. GeMS 1032 Haley, B.R., Glick, E.E., Bush, W.V., Clardy, B.F., Stone, C.G., Woodward, M.B., and Zachry, D.L., 1993, Geologic map of Arkansas: U.S. Geological Survey, scale 1:500,000. This report 674 Mudrey Jr., M.G., Brown, B.A., Greenberg, J.K., 1982, Bedrock Geologic Map of Wisconsin: Wisconsin Geological and Natural History Survey Map M-078, scale 1:1,000,000. This report 955 Zen, E-an, Goldsmith, R., Ratcliffe, N.M., Robinson, P., Stanley, R.S., Hatch, N.L., Shride, A.F., Weed, E.G.A., and Wones, D.R., 1983, Bedrock geologic map of Massachusetts: U.S. Geological Survey, 3 sheets, scale 1:250,000 This report 1426 Evans, K.V ., and Green, G.N., 2003, Geologic map of the Salmon National Forest and vicinity, east-central Idaho: U.S. Geological Survey Geologic Investigations Series I-2765, 1 sheet, scale: 1:100,000. This report 879 Spoljaric, N. and Jordan, R.R., 1966, Generalized geologic map of Delaware: Delaware Geological Survey, Special Publication 4, scale 1:297,500. This report 602 Dalton, Richard F., Monteverde, Donald H., Sugarman, Peter J., and Volkert, Richard A., compilers. Bedrock Geologic Map of New Jersey 2014. New Jersey Geological and Water Survey. 2014, Scale 1:250,000, 5 cross-sections. This report 1504 Harrison, J.E., Griggs, A.B., and Wells, J.D., 1986, Geologic and structure maps of the Wallace 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Investigations Map I-1509-A, 2 sheets, scale 1:250,000. This report 838 New Mexico Bureau of Geology and Mineral Resources, 2003, Geologic map of New Mexico: New Mexico Bureau of Geology and Mineral Resources Geologic Map, scale 1:500,000 This report 921 Caldwell, D.H., Erwin, R.B., and Woodward, H.P., 1968, Geologic Map of West Virginia: West Virginia Geological and Economic Survey Map 1, scale 1:250,000. This report 985 Sims, P.K., Peterman, Z.E., Hildebrand, T.G., and Mahan, S., 1991, Precambrian basement map of the trans-Hudson orogen and adjacent terranes, northern Great Plains, USA: U.S. Geological Survey Miscellaneous Investigations Map I-2214, scale 1:1,000,000 This report 856 Heran, W.D., Green, G.N., and Stoeser, D.B., A digital geologic map database for Oklahoma: U.S. Geological Survey Open-File Report 03-247, scale 1:250,000. This report 1430 Vuke, S.M., Lonn, J.D., Berg, R.B., and Schmidt, C.J., 2014, Geologic map of the Bozeman 30' x 60' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Open-File Report 648, 44 p., 1 sheet, scale 1:100,000. This report 591 Burchett, R.R., 1986, Geologic bedrock map of Nebraska: Nebraska Conservation and Survey Division Geologic Maps and Charts 1, scale 1:1000,000 This report 1473 Berg, R.B., Lopez, D.A., and Lonn, J.D., 2000, Geologic map of the Livingston 30' x 60' quadrangle, south-central Montana: Montana Bureau of Mines and Geology Open-File Report 406, 21 p., 1 sheet, scale 1:100,000. This report 652 Horton, J.W., Jr., and Dicken, C.L., 2000, Preliminary geologic map of the Appalachian Piedmont and Blue Ridge, South Carolina segment: U.S. Geological Survey Open-File Report 01-298, scale 1:500,000 This report 799 Sims, P.K., Lund, K., Anderson, E., 2005, Precambrian Crystalline Basement Map of Idaho - An Interpreatation of Aeromagnetic Anomalies: U.S. Geological Survey Scientific Investigation Map 2884, Scale 1:1,000,000. This report 1020 Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey, Map 35, scale 1:1,000,000. This report 1447 McDonald, C., Mosolf, J.G., Vuke, S.M., and Lonn, J.D., 2020, Geologic map of the Elliston 30? x 60? quadrangle, west-central Montana: Montana Bureau of Mines and Geology Geologic Map 77, 34 p., 1 sheet, scale 1:100,000. This report 1516 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of the Kalispell 1 x 2 degree quadrangle, Montana, and Alberta and British Columbia: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2267, 2 sheets, scale 1:250,000. This report 1501 Harrison, J.E., Whipple, J.W., and Lidke, D.J., 1998, Geologic map of the western part of the Cut Bank 1 x 2 degree quadrangle, northwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2593, 1 sheet, scale 1:250,000. This report 970 Milstein, R.L. compiler, 1987, Bedrock geology of southern Michigan: Michigan Department of Natural Resources Geological Publication BG-01, scale 1:500,000. This report 1429 Miller, F.K., and Burmester, R.F., 2004, Geologic map of the Bonner's Ferry 30' X 60' quadrangle, Idaho and Montana: U.S. Geological Survey Miscellaneous Field Studies Map MP-2426, scale 1:100,000. This report 882 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1102 Hardeman, W.D., Miller, R.A., and Swingle, G.D., 1966, Geologic Map of Tennessee: Tennessee Division of Geology State Geologic Map, scale 1:250,000 This report 1487 Harrison, J.E., Griggs, A.B., and Wells, J.D., 1986, Geologic and structure maps of the Wallace 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Investigations Map I-1509-A, 2 sheets, scale 1:250,000. This report 1113 Barnes, V.E. (project supervisor), Hartmann, B.A., and Scranton, D.F. (cartography), 1992, Geologic Map of Texas: The University of Texas at Austin, Texas Bureau of Economic Geology, scale 1:500,000. This report 812 Sims, P.K., 1990, Precambrian basement map of the northern Midcontinent, U.S.A.: U.S. Geological Survey, Miscellaneous Investigations Series Map I-1853-A, scale 1:1,000,000. This report 621 Bluemle, J.P., 1983, Geologic and topographic bedrock map of North Dakota: North Dakota Geological Survey Miscellaneous Map 25, scale 1:670,000 This report 1467 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of Kalispell 1 x 2 degree quadrangle, Montana and Alberta, British Columbia: United States Geological Survey USGS Miscellaneous Geologic Investigation 2267, 2 sheets, scale 1:250,000. This report 644 Hermes, O.D., Gromet, L.P., Murray, D.P., Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Geological Survey Rhode Island Map Series Map 1, scale 1:100,000. This report 946 Osberg, P.H., Hussey, A.M. and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Geologic Map Series BGMM, scale 1:500,000. This report 1505 Reynolds, M.W., and Brandt, T.R., 2006, Preliminary geologic map of the Townsend 30' x 60' quadrangle, Montana: U.S. Geological Survey Open-File Report 2006-1138, scale 1:100,000. This report 935 Gray, H.H., Ault, C.H., and Keller, S.J., 1987, Bedrock geologic map of Indiana: Indiana Geological Survey Miscellaneous Map 48, scale 1:500,000 This report 1010 Sims, P.K., Finn, C.A., and Rystrom, V.L., 2001, USGS Open-File Report 01-199: Preliminary Precambrian Basement Map Showing Geologic-Geophysical Domains, Wyoming: U.S. Geological Survey, scale 1:1,000,000 This report 1419 Digital database of the Montana state geologic map, submitted to STATEMAP in GeMS This report 1445 Skipp, Betty, Janecke, S.U., 2004, Geologic map of the Montana part of the Dubois 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 490, 12 p., 1 sheet, scale 1:100,000. This report 1091 Thompson, D.E., 2011, Geologic Map of Mississippi; after Bickler, A.R., 1969, Geologic Map of Mississippi: Mississippi Department of Environmental Quality, Office of Geology, scale 1:500,000. This report 1408 Walker, G.W., and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000 This report 1482 Berg, R.B., and Lonn, J.D., 1996, Preliminary geologic map of the Nez Perce Pass 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Open-File Report 339, 9 p., 1 sheet, scale 1:100,000. This report 1458 Lonn, J.D., and Berg, R.B., 1996, Geologic map of the Hamilton 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 340, 8 p., 1 sheet, scale 1:100,000. This report 1055 Lawton, D.E., Moye, F.J., Murray, J.B., O'Connor, B.J., Penley, H.M., Sandrock, G.S., Marsalis, W.E., Friddell, M.S., Hetrick, J.H., Huddlestun, P.F., Hunter, R.E., Mann, W.R., Martin, B.F., Pickering, S.M., Schneeberger, F.J., and Wilson, J.D., 1976, Geologic map of Georgia: Georgia Geological Survey, scale 1:500,000 This report 1514 Ruppel, E.T., O'Neill, J.M., and Lopez, D.A., 1993, Geologic map of the Dillon 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Geologic Investigations Map 1803-H, 1 sheet, scale 1:250,000. This report 874 Rodgers, John, 1985, Bedrock geological map of Connecticut: Connecticut Geological and Natural History Survey, Department of Environmental Protection, 2 sheets, scale 1:125,000. This report 597 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 598 Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock geologic map of New Hampshire: U.S. Geological Survey, scale 1:250,000. This report 1489 Lopez, D.A., 2001, Preliminary geologic map of the Red Lodge 30' x 60' quadrangle, south-central Montana: Montana Bureau of Mines and Geology Open-File Report 423, 17 p., 1 sheet. This report 1433 Scarberry, K.C., Elliott, C.G., and Yakovlev, P.V., 2019, Geology of the Butte North 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 715, 30 p., 1 sheet, scale 1:100,000. This report 1448 Kellogg, K.S., and Williams, V.S., 2006, Geologic map of the Ennis 30' x 60' quadrangle, Madison and Gallatin counties, Montana, and Park County, Wyoming: Montana Bureau of Mines and Geology Open-File Report 529, 27 p., 1 sheet, scale 1:100,000. This report 896 Hintze, L.F., 1980, Geologic map of Utah: Utah Geological and Mineral Survey, Map A-1, scale 1:500,000. This report 1469 Ruppel, E.T., 1998, Geologic map of the eastern part of the Leadore 30' x 60' quadrangle, Montana and Idaho: Montana Bureau of Mines and Geology Open-File Report 372, 9 p., 1 sheet, scale 1:100,000. This report 1645 Osborne, W.E., Szabo, M.W., Copeland Jr., C.W., and Neathery, T.L., 1989, Geologic Map of Alabama: Geological Survey of Alabama Special Map 221, scale 1:500,000. This report 1632 Schuster, J.E., 2005, Geologic map of Washington State: Washington Division of Geology and Earth Resources, Geologic Map GM-53, scale 1:500,000. This report 1655 Cleaves, E.T., Edwards, J., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Scale 1:250,000. This report 835 Stewart, J.H, and Carlson, J.E., 1978, Geologic Map of Nevada: U.S. Geological Survey, scale 1:500,000 This report 962 Reed, R.C., and Daniels, J., compilers., 1987, Bedrock geology of northern Michigan: Michigan Department of Natural Resources, Geological Survey Division, scale 1:500,000. This report 1509 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of the Kalispell 1 x 2 degree quadrangle, Montana, and Alberta and British Columbia: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2267, 2 sheets, scale 1:250,000. This report 632 Berg, T.M., Edmunds, W.E., Geyer, A.R., Glover, A.D., Hoskins, D.M., MacLachlan, D.B., Root, S.I., Sevon, W.D., and Socolow, A.A. 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey Map 1, Scale 1:250,000. This report 1666 Jennings, C.W., Gutierrez, C., Bryant, W., Saucedo, G., and Wills, C., 2010, Geologic Map of California: California Geological Survey Geologic Data Map GDM-2.2010 This report 871 Love, J.D., and Christiansen, A.C., 1985, Geologic map of Wyoming: U.S. Geological Survey, scale 1:500,000 This report 1423 Vuke, S.M., Berg, R.B., Colton, R.B., and O'Brien, H.E., 2002, Geologic map of the Belt 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 450, 19 p., 2 sheets, scale 1:100,000. This report 1471 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of the Kalispell 1 x 2 degree quadrangle, Montana, and Alberta and British Columbia: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2267, 2 sheets, scale 1:250,000. This report 1046 Scott, T.M., Campbell, K.M., Rupert, F.R., Arthur, J.D., Green, R.C., Means, G.H., Missimer, T.M., Lloyd, J.M., Yon, J.W. and Duncan, J.G., 2001, Geologic map of the state of Florida: Florida Geological Survey, Map Series 146, scale 1:1,000,000 (revised 2006). This report 1491 McDonald, C., Lopez, D.A., Berg, R.B., and Gibson, R.I., 2005, Preliminary geologic map of the Ringling 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 511, 27 p., 1 sheet, scale 1:100,000. This report 1463 O'Neill, J.M., and Christiansen, R.L., 2002, Geologic map of the Hebgen Lake 30' x 60' quadrangle, Beaverhead, Madison, and Gallatin counties, Montana, Park and Teton counties, Wyoming, and Clark and Fremont Counties, Idaho: Montana Bureau of Mines and Geology Open-File Report 464, 21 p., 1 sheet, scale 1:100,000. This report 623 Slucher, E.R., Swinford, E.M., Larsen, G.E., Schumacher, G.A., Shrake, D.L., Rice, C.L., Caudill, M.R., Rea, R.G., and Powers, D.M., 2006, Bedrock geologic map of Ohio: Ohio Division of Geological Survey, Map BG-1, scale 1:500,000. This report 1073 Noger, M.C., 1988, Geologic map of Kentucky: U.S. Geological Survey, scale 1:500,000. This report 614 Rickard, L.V., Isachsen, Y.W., and Fisher, D.W., 1970, Geologic Map of New York: New York State Museum and Science Service Map and Chart Series 15 (Explanatory sheet published in 1971), 5 sheets, scale 1:250,000 This report 999 Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Series Map I-2185, scale: 1:500,000 This report 666 Ratcliffe, N.M., Stanley, R.S., Gale, M.H., Thompson, P.J., Walsh, G.J., Hatch, N.L., Rankin, D.W., Doolan, B.L., Kim, Jonathan, Mehrtens, C.J., Aleinikoff, J.N., McHone, J.G., and Masonic, L.M., 2011, Bedrock Geologic Map of Vermont: U.S. Geological Survey Scientific Investigations Map SIM-3184, scale 1:100,000. This report 1443 Ruppel, E.T., O'Neill, J.M., and Lopez, D.A., 1993, Geologic map of the Dillon 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Geologic Investigations Map 1803-H, 1 sheet, scale 1:250,000. This report 1453 Berg, R.B., Lonn, J.D., and Locke, W.W., 1999, Geologic map of the Gardiner 30' x 60' quadrangle, south-central Montana: Montana Bureau of Mines and Geology Open-File Report 387, 11 p., 1 sheet, scale 1:100,000. This report 1496 Lewis, R.S., Burmester, R.F., Breckenridge, R.M., McFaddan, M.D., and Phillips, W.M., 2008, Preliminary geologic map of the Sandpoint 30' x 60' quadrangle, Idaho and Montana, and the Idaho part of the Chewelah 30' x 60' quadrangle: Idaho Geological Survey, Digital Web Map DWM-94, scale 1:100,000. This report 1500 Mudge, M.R., Earhart, R.L., Whipple, J.W., and Harrison, J.E., 1983, Geologic and structure maps of the Choteau 1 x 2 degree quadrangle, northwestern Montana: Montana Bureau of Mines and Geology Montana Atlas 3-A, 2 sheets, scale 1:250,000. This report 816 Jirsa, M.A., Boerboom, T.J., and Chandler, V.W., 2012, Geologic Map of Minnesota, Precambrian bedrock geology: Minnesota Geological Survey State Map Series S-22, scale 1:500,000. This report 1479 Lonn, J.D., McDonald, C., Sears, J.W., and Smith, L.N., 2010, Geologic map of the Missoula East 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 593, 2 sheets, scale 1:100,000. This report 1095 Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic map of South Dakota: South Dakota Geological Survey General Map G-10, scale 1:500,000. This report 908 Virginia Division of Mineral Resources, 1993, Geologic map of Virginia, Virginia Division of Mineral Resources, series unknown, 1:500,000. This report 848 North Carolina Geological Survey, 1985, Geologic map of North Carolina: North Carolina Geological Survey General Geologic Map, scale 1:500,000. This report 1442 Vuke, S.M., 2014, Preliminary geologic map of the Dearborn River 30' x 60' quadrangle, west-central Montana: Montana Bureau of Mines and Geology Open-File Report 649, 9 p., 1 sheet, scale 1:100,000. This report 1444 Bergantino, R.N., 2001, Geologic map of the Dodson 30' x 60' quadrangle, north-central Montana: Montana Bureau of Mines and Geology Open-File Report 439, 9 p., 1 sheet, scale 1:100,000. This report 1424 Porter, K.W., Wilde, E.M., and Vuke, S.M., 1996, Preliminary geologic map of the Big Snowy Mountains 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 341, 16 p., 1 sheet, scale 1:100,000. This report 1517 Porter, K.W., and Wilde, E.M., 2001, Geologic map of the Zortman 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 438, 16 p., 1 sheet, scale 1:100,000. This report 940 Witzke, B.J., Anderson, R.R., and Pope, J.P., 2010, Bedrock Geologic Map of Iowa: Iowa Geological Survey Open-File Map OFM-2010-01, scale 1:500,000. This report 655 Tomhave, D.W., and Schulz, L.D., 2004, Bedrock geologic map showing configuration of the bedrock surface in South Dakota east of the Missouri River: South Dakota Geological Survey General Map 9, scale 1:500,000 This report 783 Sims, P.K., Bankey, V., Finn, C.A., 2001, Preliminary Precambrian basement map of Colorado-a geologic interpretation of the aeromagnetic anomaly map: U.S. Geological Survey Open-File Report 01-364, scale 1:1,000,000 This report 1472 Lonn, J.D., Skipp, B., Ruppel, E.T., Janecke, S.U., Perry Jr., W.J., Sears, J.W., Bartholomew, M.J., Stickney, M.C., Fritz, W.J., Hurlow, H.A., and Thomas, R.C., 2000, Geologic map of the Lima 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 408, 42 p., 2 sheets, scale 1:100,000. This report 1035 Tweto, Ogden, 1979, Geologic map of Colorado: U.S. Geological Survey, scale 1:500,000 This report 1498 Mudge, M.R., Earhart, R.L., Whipple, J.W., and Harrison, J.E., 1983, Geologic and structure maps of the Choteau 1 x 2 degree quadrangle, northwestern Montana: Montana Bureau of Mines and Geology Montana Atlas 3-A, 2 sheets, scale 1:250,000. This report 1435 Reynolds, M.W., and Brandt, T.R., 2005, Geologic map of the Canyon Ferry Dam 30' x 60' quadrangle, west-central Montana: U.S. Geological Survey Scientific Investigations Map 2860, 32 p., 3 sheets, scale 1:100,000. . This report 1507 Lonn, J.D., and McFaddan, M.D., 1999, Geologic map of the Montana part of the Wallace 30' x 60' quadrangle: Montana Bureau of Mines and Geology Open-File Report 388, 15 p., 2 sheets, scale 1:100,000. This report 1065 Kansas Geological Survey, 2008, Surficial Geology of Kansas: Kansas Geological Survey, Map M-118, scale 1:500,000 This report 2 Starbuck, E.A., 2017, Geologic map of Missouri, 2017; Missouri Geological Survey, GM-02-2017, scale 1:500000. This report 794 Anderson, R., 2006, Geology of the Precambrian surface of Iowa and surrounding area: Iowa Geological Survey Open File Map OFM-06-7, scale 1:1,000,000. This report 1494 Lonn,J.D., Elliott, C.G., Lewis, R.S., Burmester, R.F., McFaddan, M.D., Stanford, L.R., and Jänecke, S.U., 2019, Geologic map of the Montana part of the Salmon 30' x 60' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Geologic Map 75, 28 p., 1 sheet, scale 1:100,000. This report 1084 Snead, J.I., and McCulloh, R.P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey Geologic Map 5, scale 1:500,000. This report 887 Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000. This report 1508 Reynolds, M.W., and Brandt, T.R., 2007, Preliminary geologic map of the White Sulphur Springs 30' x 60' quadrangle, Montana: U.S. Geological Survey Open-File Report 2006-1329, scale 1:100,000. This report 1431 Lopez, D.A., 2000, Geologic map of the Bridger 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 58, 1 sheet, scale 1:100,000. This report 1474 Vuke, S.M., Wilde, E.M., Lopez, D.A., and Bergantino, R.N., 2000, Geologic map of the Lodge Grass 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 56, 1 sheet, scale 1:100,000. This report 1434 McDonald, C., Elliott, C.G., Vuke, S.M., Lonn, J.D., and Berg, R.B., 2012, Geologic map of the Butte South 30' x 60' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Open-File Report 622, 1 sheet, scale 1:100,000. This report 1485 Lonn, J.D., Smith, L.N., and McCulloch, R.B., 2007, Geologic map of the Plains 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 554, 43 p., 1 sheet, scale 1:100,000. This report 1484 Lonn, J.D., McDonald, C., Lewis, R.S., Kalakay, T.J., O'Neill, J.M., Berg, R.B., and Hargrave, P., 2003, Geologic map of the Philipsburg 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 483, 1 sheet, scale 1:100,000. This report 827 Sims, P.K., O'Neill, J.M., Bankey, V., and Anderson, E., 2004, Precambrian basement geologic map of Montana -- an interpretation of aeromagnetic anomalies: U.S. Geological Survey, Scientific Investigations Map SIM-2829, scale 1:1,000,000. This report 1464 Harrison, J.E., Whipple, J.W., and Lidke, D.J., 1998, Geologic map of the western part of the Cut Bank 1 x 2 degree quadrangle, northwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2593, 1 sheet, scale 1:250,000. This report 1480 Lewis, R.S., 1998, Preliminary geologic map of the Montana part of the Missoula West 30' x 60' quadrangle: Montana Bureau of Mines and Geology Open-File Report 373, 20 p., 1 sheet, scale 1:100,000. This report 994 McCormick, K.A., 2010, Precambrian Basement Terrane of South Dakota: South Dakota Geological Survey Bulletin 41, 2 Plates, Scale 1:1,000,000. This report 1652 Lewis, R.S., Link, P.K., Stanford, L.R., and Long, S.P., 2012, Geologic map of Idaho: Idaho Geological Survey, Map M-9, scale 1:750,000. This report Notes Additional information specific to a particular feature or table entry. GeMS Unrepresentable domain. Free text. Values of <null> or #null indicate no entry. MapUnitPolys_ID Primary key. GeMS Arbitrary string. Values should be unique within this database. MapSourceID Identifies source map. Foreign key to DataSources table. This Report Unrepresentable domain Source_MapUnit Short, easily understood ASCII-character identifier for the source map unit. Prefixed with a MapSourceID value (from Source_DescriptionOfMapUnits) to differentiate identically-named source map units from different source maps. Otherwise conceptually equivalent to the "MapUnit" field in the GeMS "DescriptionOfMapUnits" table. This Report Unrepresentable domain ContactsAndFaults Contacts between map units, faults that bound map units, and associated dangling faults. Includes concealed faults and contacts, waterlines, snowfield and glacier boundaries, and map boundary. In the original file geodatabase, this dataset is found within the GeologicMap feature dataset. GeMS OBJECTID Internal feature number ESRI Unrepresentable domain Shape Internal geometry object ESRI Unrepresentable domain Shape_Length Internal feature length, double ESRI Unrepresentable domain Type Classifier that specifies what kind of geologic feature is represented by a database element: that a certain line within feature class ContactsAndFaults is a contact, or thrust fault, or water boundary; or that a point in GeochronPoints represents a K-Ar date. GeMS reverse fault A fault on which the hanging wall has moved upward relative to the footwall. The dip of the fault is usually greater than 45°. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. caldera margin [The margin of] a large, basin-shaped volcanic depression, more or less circular or cirquelike in form, the diameter of which is many times greater than that of the included vent or vents, no matter what the steepness of the walls or form of the floor (Williams, 1941). It is formed by collapse during an eruption. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. shoreline A line delineating the boundary of a body of water, such as a river, lake, or the ocean This Report internal contact A planar or irregular surface separating different portions of the same geologic map unit, such as individual landslide blocks with a mapped landslide, or separately emplaced portions of a composite plutonic unit. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. thrust fault A fault with a dip of 45° or less over much of its extent, on which the hanging wall has moved upward relative to the footwall. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. strike-slip fault, right lateral offset A strike-slip fault on which the side opposite the observer has been displaced to the right. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. gradational contact A contact defined by a gradual or continuous lithologic change from one geologic map unit to another. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. contact A plane or irregular surface between two types or ages of rock. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. detachment fault A regionally extensive, gently dipping normal fault that is commonly associated with extension in a metamorphic core complex. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. normal fault A fault in which the hanging wall has moved downward relative to the footwall. The angle of the fault is usually 45-90 degrees, and in most cases close to 60 degrees. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. oblique-slip fault, left lateral offset A fault on which the net slip has dip slip and strike slip components, and the side opposite the observer has been displaced to the left. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. shear zone A discrete, parallel-sided zone of localized shearing displacement, which may be recognized by sigmoidal mineral-filled veins, locally well-developed cleavage or foliation, wholesale grain-size reduction or mylonitization, or some combination of these features. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. glacial terminus The lower margin or extremity of a glacier, referring to the maximum extent (limit) reached by the glacier. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. overturned thrust fault A fault with an original dip of 45° or less over much of its extent, on which the hanging wall has moved upward relative to the footwall, that has subsequently been rotated beyond perpendicular so that the primary hanging wall and footwall positioning have been reversed. This Report strike-slip fault, left lateral offset A strike-slip fault on which the side opposite the observer has been displaced to the left. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. scratch boundary Arbitrary, non-physical boundary between map units on a geologic map. For example, between an undivided unit and its subunits, or between different names for the same package of rocks. This Report lineament A linear feature that has been determined from aerial photographs or remotely sensed data but not identified on the ground. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. key bed A well-defined, easily identifiable stratum or body of strata that has sufficiently distinctive characteristics (such as lithology or fossil content) to facilitate correlation in field mapping or subsurface work. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. fault A discrete surface or zone of discrete surfaces separating two rock masses across which one mass has slid past the other. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. listric fault A curved downward-flattening fault, generally concave upward. Listric faults may be characterized by normal or reverse separation, but the term is used most frequently in normal faulting and is often a characteristic of growth faults. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. low-angle normal fault A fault in which the hanging wall has moved downward relative to the footwall. The angle of the fault is less than 45 degrees. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. oblique-slip fault, right lateral offset A fault on which the net slip has dip slip and strike slip components, and the side opposite the observer has been displaced to the right. Jackson, J.A., Mehl, James P., and Neuendorf, Klaus K.E., 2007, Glossary of Geology: American Geosciences Institute, Alexandria VA, online ed. map boundary The boundary of the map. In a GIS database, the line that bounds the outer extent of the polygons. This Report IsConcealed Flag for contacts and faults covered by overlying map unit. GeMS Unrepresentable domain LocationConfidenceMeters Estimated half-width in meters of positional uncertainty envelope; position is relative to other features in database. GeMS Positive real number. Value of -9, -99, or -999 indicates value is unknown. ExistenceConfidence Confidence that feature exists. GeMS questionable Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = questionable is appropriate when a geologist reasons "I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault." Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. IdentityConfidence Confidence that feature is correctly identified. GeMS questionable Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = questionable is appropriate when a geologist reasons "I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault." Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. Label Plain-text equivalent of the desired annotation for a feature: for example "14 Ma", or "^c" which (when used with the FGDC GeoAge font) results in the geologic map-unit label TRc (with TR run together to make the Triassic symbol). GeMS Unrepresentable domain Symbol Reference to a point marker, line symbol, or area-fill symbol that is used on the map graphic to denote the feature: perhaps a star for a K-Ar age locality, or a heavy black line for a fault. GeMS Unrepresentable domain DataSourceID Source of data; foreign key to table DataSources. GeMS 1093 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 370 Nusbaum, R.L., 1978, Bedrock geologic map of the Iron Mountain Lake 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO7813, scale 1:24000. This report 1032 Haley, B.R., Glick, E.E., Bush, W.V., Clardy, B.F., Stone, C.G., Woodward, M.B., and Zachry, D.L., 1993, Geologic map of Arkansas: U.S. Geological Survey, scale 1:500,000. This report 674 Mudrey Jr., M.G., Brown, B.A., Greenberg, J.K., 1982, Bedrock Geologic Map of Wisconsin: Wisconsin Geological and Natural History Survey Map M-078, scale 1:1,000,000. This report 1426 Evans, K.V ., and Green, G.N., 2003, Geologic map of the Salmon National Forest and vicinity, east-central Idaho: U.S. Geological Survey Geologic Investigations Series I-2765, 1 sheet, scale: 1:100,000. This report 955 Zen, E-an, Goldsmith, R., Ratcliffe, N.M., Robinson, P., Stanley, R.S., Hatch, N.L., Shride, A.F., Weed, E.G.A., and Wones, D.R., 1983, Bedrock geologic map of Massachusetts: U.S. Geological Survey, 3 sheets, scale 1:250,000 This report 650 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 879 Spoljaric, N. and Jordan, R.R., 1966, Generalized geologic map of Delaware: Delaware Geological Survey, Special Publication 4, scale 1:297,500. This report 602 Dalton, Richard F., Monteverde, Donald H., Sugarman, Peter J., and Volkert, Richard A., compilers. Bedrock Geologic Map of New Jersey 2014. New Jersey Geological and Water Survey. 2014, Scale 1:250,000, 5 cross-sections. This report 1504 Harrison, J.E., Griggs, A.B., and Wells, J.D., 1986, Geologic and structure maps of the Wallace 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Investigations Map I-1509-A, 2 sheets, scale 1:250,000. This report 838 New Mexico Bureau of Geology and Mineral Resources, 2003, Geologic map of New Mexico: New Mexico Bureau of Geology and Mineral Resources Geologic Map, scale 1:500,000 This report 346 Sides, J.R., 1983, Geologic map of exposed Precambrian rocks in the Lake Killarney quadrangle, Missouri [7.5]; Missouri Geological Survey, Open-File Map, OFM-83-162-MR, scale 1:24000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 921 Caldwell, D.H., Erwin, R.B., and Woodward, H.P., 1968, Geologic Map of West Virginia: West Virginia Geological and Economic Survey Map 1, scale 1:250,000. This report 335 Anderson, R.E., 1962, Geologic map of Precambrian igneous rocks in the Taum Sauk area, Missouri; Missouri Geological Survey, RO6203, scale 1:62500. This report 985 Sims, P.K., Peterman, Z.E., Hildebrand, T.G., and Mahan, S., 1991, Precambrian basement map of the trans-Hudson orogen and adjacent terranes, northern Great Plains, USA: U.S. Geological Survey Miscellaneous Investigations Map I-2214, scale 1:1,000,000 This report 856 Heran, W.D., Green, G.N., and Stoeser, D.B., A digital geologic map database for Oklahoma: U.S. Geological Survey Open-File Report 03-247, scale 1:250,000. This report 1430 Vuke, S.M., Lonn, J.D., Berg, R.B., and Schmidt, C.J., 2014, Geologic map of the Bozeman 30' x 60' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Open-File Report 648, 44 p., 1 sheet, scale 1:100,000. This report 958 US Census State Borders This report 333 Robertson, F.S., 1961, Precambrian geology of the St. Francois Mountains in the Ironton 15' quadrangle, Missouri; Missouri Geological Survey, RO6101, scale 1:62500. | McCracken, Mary H., 1971, Structural features of Missouri; Missouri Geological Survey and Water Resources, RI-049, vi+99 p., 1 pl., 11 figs. This report 976 US Census State Borders This report 1003 US Census State Borders This report 591 Burchett, R.R., 1986, Geologic bedrock map of Nebraska: Nebraska Conservation and Survey Division Geologic Maps and Charts 1, scale 1:1000,000 This report 1473 Berg, R.B., Lopez, D.A., and Lonn, J.D., 2000, Geologic map of the Livingston 30' x 60' quadrangle, south-central Montana: Montana Bureau of Mines and Geology Open-File Report 406, 21 p., 1 sheet, scale 1:100,000. This report 1036 US Census State Borders This report 1089 US Census State Borders This report 799 Sims, P.K., Lund, K., Anderson, E., 2005, Precambrian Crystalline Basement Map of Idaho - An Interpreatation of Aeromagnetic Anomalies: U.S. Geological Survey Scientific Investigation Map 2884, Scale 1:1,000,000. This report 652 Horton, J.W., Jr., and Dicken, C.L., 2000, Preliminary geologic map of the Appalachian Piedmont and Blue Ridge, South Carolina segment: U.S. Geological Survey Open-File Report 01-298, scale 1:500,000 This report 673 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 287 Berry, A.W., Jr., 1970, Geologic map of a portion of the Taum Sauk Caldera, St. Francois Mountains, Missouri; Missouri Geological Survey, RO7001, scale 1:24000. | Robertson, C.E., 1995, Geologic map of the southeast part of the Ironton 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO9503, scale 1:24000. This report 1020 Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey, Map 35, scale 1:1,000,000. This report 1447 McDonald, C., Mosolf, J.G., Vuke, S.M., and Lonn, J.D., 2020, Geologic map of the Elliston 30? x 60? quadrangle, west-central Montana: Montana Bureau of Mines and Geology Geologic Map 77, 34 p., 1 sheet, scale 1:100,000. This report 1437 Berg, R.B., 2008, Geologic map of the Choteau 30' x 60' quadrangle, north central Montana: Montana Bureau of Mines and Geology Open-File Report 571, 16 p., 1 sheet, scale 1:100,000. This report 1516 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of the Kalispell 1 x 2 degree quadrangle, Montana, and Alberta and British Columbia: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2267, 2 sheets, scale 1:250,000. This report 1501 Harrison, J.E., Whipple, J.W., and Lidke, D.J., 1998, Geologic map of the western part of the Cut Bank 1 x 2 degree quadrangle, northwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2593, 1 sheet, scale 1:250,000. This report 348 Brown, V.M., 1983, Geology [of exposed Precambrian rocks] of the Des Arc NE 7 1/2' quadrangle, southeast Missouri; Missouri Geological Survey, Open-File Map, OFM-84-198-GI, scale 1:24000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 970 Milstein, R.L. compiler, 1987, Bedrock geology of southern Michigan: Michigan Department of Natural Resources Geological Publication BG-01, scale 1:500,000. This report 1429 Miller, F.K., and Burmester, R.F., 2004, Geologic map of the Bonner's Ferry 30' X 60' quadrangle, Idaho and Montana: U.S. Geological Survey Miscellaneous Field Studies Map MP-2426, scale 1:100,000. This report 365 Amos, D.H. and Desborough, G.A., 1970, Geologic map of parts of the Ironton and Fredericktown areas, Missouri; Missouri Geological Survey, Report of Investigations, RI-047, pl-1, RO7003, scale 1:36000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 882 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1102 Hardeman, W.D., Miller, R.A., and Swingle, G.D., 1966, Geologic Map of Tennessee: Tennessee Division of Geology State Geologic Map, scale 1:250,000 This report 328 Stickel, J.E., Jr., 1949, Igneous geology of the Bonne Terre 15' quadrangle, Missouri; Missouri Geological Survey, RO4902, scale 1:30000. This report 332 Zimmerman, R.A., 1959, Geologic map of the Annapolis area, Missouri; Missouri Geological Survey, RO5913, scale 1:62500. This report 200 Satterfield, I.R., 1980, Reconnaissance geologic map of the Higdon 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO8003, scale 1:24000. This report 372 Nusbaum, R.L., 1978, Bedrock geologic map of the Iron Mountain Lake 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO7813, scale 1:24000. | Nusbaum, R.L., 1978, [Bedrock geologic map of the Iron Mountain Lake 7.5' quadrangle, Missouri]; Missouri Geological Survey, RO7813B, scale 1:24000. | Nusbaum, Robert l., 1980, A Precambrian collapse caldera boundary in the St. Francois Mountains, southeast Missouri; University of Kansas, Master's Thesis, ii+77 p., 9 figs., 1 pl., 8 tbls., 3 apps. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 1487 Harrison, J.E., Griggs, A.B., and Wells, J.D., 1986, Geologic and structure maps of the Wallace 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Investigations Map I-1509-A, 2 sheets, scale 1:250,000. This report 1113 Barnes, V.E. (project supervisor), Hartmann, B.A., and Scranton, D.F. (cartography), 1992, Geologic Map of Texas: The University of Texas at Austin, Texas Bureau of Economic Geology, scale 1:500,000. This report 812 Sims, P.K., 1990, Precambrian basement map of the northern Midcontinent, U.S.A.: U.S. Geological Survey, Miscellaneous Investigations Series Map I-1853-A, scale 1:1,000,000. This report 621 Bluemle, J.P., 1983, Geologic and topographic bedrock map of North Dakota: North Dakota Geological Survey Miscellaneous Map 25, scale 1:670,000 This report 611 US Census State Borders This report 286 Robertson, C.E., 1995, Geologic map of the southeast part of the Ironton 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO9503, scale 1:24000. This report 341 Amos, D.H. and Desborough, G.A., 1970, Geologic map of parts of the Ironton and Fredericktown areas, Missouri; Missouri Geological Survey, Report of Investigations, RI-047, pl-1, RO7003, scale 1:36000. This report 1467 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of Kalispell 1 x 2 degree quadrangle, Montana and Alberta, British Columbia: United States Geological Survey USGS Miscellaneous Geologic Investigation 2267, 2 sheets, scale 1:250,000. This report 644 Hermes, O.D., Gromet, L.P., Murray, D.P., Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Geological Survey Rhode Island Map Series Map 1, scale 1:100,000. This report 645 US Census State Borders This report 946 Osberg, P.H., Hussey, A.M. and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Geologic Map Series BGMM, scale 1:500,000. This report 1505 Reynolds, M.W., and Brandt, T.R., 2006, Preliminary geologic map of the Townsend 30' x 60' quadrangle, Montana: U.S. Geological Survey Open-File Report 2006-1138, scale 1:100,000. This report 367 Anderson, R.E., 1962, Geologic map of Precambrian igneous rocks in the Taum Sauk area, Missouri; Missouri Geological Survey, RO6203, scale 1:62500. | Amos, D.H. and Desborough, G.A., 1970, Geologic map of parts of the Ironton and Fredericktown areas, Missouri; Missouri Geological Survey, Report of Investigations, RI-047, pl-1, RO7003, scale 1:36000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 529 Satterfield, I.R., 1980, Reconnaissance geologic map of the Higdon 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO8003, scale 1:24000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. | McCracken, Mary H., 1971, Structural features of Missouri; Missouri Geological Survey and Water Resources, RI-049, vi+99 p., 1 pl., 11 figs. This report 366 Anderson, R.E., 1962, Geologic map of Precambrian igneous rocks in the Taum Sauk area, Missouri; Missouri Geological Survey, RO6203, scale 1:62500. | Berry, A.W., Jr., 1970, Geologic map of a portion of the Taum Sauk Caldera, St. Francois Mountains, Missouri; Missouri Geological Survey, RO7001, scale 1:24000. This report 630 US Census State Borders This report 422 Anderson, Roy Ernest, 1970, Ash-flow tuffs of Precambrian age in southeast Missouri; Missouri Geological Survey and Water Resources, Report of Investigations 46 (Contribution to Precambrian Geology No. 2), vi+50 p., 1 pl., 8 figs., 1 tbl. This report 224 Berry, A.W., Jr., 1970, Geologic map of a portion of the Taum Sauk Caldera, St. Francois Mountains, Missouri; Missouri Geological Survey, RO7001, scale 1:24000. This report 935 Gray, H.H., Ault, C.H., and Keller, S.J., 1987, Bedrock geologic map of Indiana: Indiana Geological Survey Miscellaneous Map 48, scale 1:500,000 This report 938 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1053 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1010 Sims, P.K., Finn, C.A., and Rystrom, V.L., 2001, USGS Open-File Report 01-199: Preliminary Precambrian Basement Map Showing Geologic-Geophysical Domains, Wyoming: U.S. Geological Survey, scale 1:1,000,000 This report 893 US Census State Borders This report 820 US Census State Borders This report 1419 Digital database of the Montana state geologic map, submitted to STATEMAP in GeMS This report 1406 US Census State Borders This report 629 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 613 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1445 Skipp, Betty, Janecke, S.U., 2004, Geologic map of the Montana part of the Dubois 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 490, 12 p., 1 sheet, scale 1:100,000. This report 1091 Thompson, D.E., 2011, Geologic Map of Mississippi; after Bickler, A.R., 1969, Geologic Map of Mississippi: Mississippi Department of Environmental Quality, Office of Geology, scale 1:500,000. This report 194 Satterfield, I.R., 1980, Reconnaissance geologic map of the Marquand 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO8005, scale 1:24000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 1408 Walker, G.W., and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000 This report 1482 Berg, R.B., and Lonn, J.D., 1996, Preliminary geologic map of the Nez Perce Pass 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Open-File Report 339, 9 p., 1 sheet, scale 1:100,000. This report 635 US Census State Borders This report 340 Klimstra, R.K., 1964, Areal geologic map of the Silvermine Granite in the Ironton and Fredericktown 15' quadrangles, Missouri; Missouri Geological Survey, RO6402, scale 1:43700. This report 826 US Census State Borders This report 821 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 967 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 423 Crane, G.W., 1908, Geologic map of the Bonne Terre 15' quadrangle, Missouri; Missouri Geological Survey, Preliminary Map, RO0802, scale 1:62500. | Buckley, E.R., 1908, Geologic and topographic map of the Bonne Terre sheet 15' quadrangle, Missouri; Missouri Geological Survey, Volume, 2nd Series, V-009, part-2, pl-043, RO0802C, scale 1:62500. This report 1458 Lonn, J.D., and Berg, R.B., 1996, Geologic map of the Hamilton 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 340, 8 p., 1 sheet, scale 1:100,000. This report 895 US Census State Borders This report 1055 Lawton, D.E., Moye, F.J., Murray, J.B., O'Connor, B.J., Penley, H.M., Sandrock, G.S., Marsalis, W.E., Friddell, M.S., Hetrick, J.H., Huddlestun, P.F., Hunter, R.E., Mann, W.R., Martin, B.F., Pickering, S.M., Schneeberger, F.J., and Wilson, J.D., 1976, Geologic map of Georgia: Georgia Geological Survey, scale 1:500,000 This report 1098 US Census State Borders This report 1514 Ruppel, E.T., O'Neill, J.M., and Lopez, D.A., 1993, Geologic map of the Dillon 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Geologic Investigations Map 1803-H, 1 sheet, scale 1:250,000. This report 1643 US Census State Borders This report 975 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 874 Rodgers, John, 1985, Bedrock geological map of Connecticut: Connecticut Geological and Natural History Survey, Department of Environmental Protection, 2 sheets, scale 1:125,000. This report 1082 US Census State Borders This report 894 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 583 US Census State Borders This report 598 Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock geologic map of New Hampshire: U.S. Geological Survey, scale 1:250,000. This report 798 US Census State Borders This report 920 US Census State Borders This report 597 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1489 Lopez, D.A., 2001, Preliminary geologic map of the Red Lodge 30' x 60' quadrangle, south-central Montana: Montana Bureau of Mines and Geology Open-File Report 423, 17 p., 1 sheet. This report 603 This Report This report 566 Orndorff, R.C. and Harrison, R.W., 2001, Geologic map of the Winona quadrangle, Shannon County, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2749, scale 1:24000. | Harrison, R.W., Orndorff, R.C., and Weary, D.J., 2002, Geologic map of the Stegall Mountain 7.5-minute quadrangle, Shannon and Carter counties, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2767, scale 1:24000. | Orndorff, R.C., 2003, Geologic map of the Fremont quadrangle, Shannon, Carter, and Oregon counties, Missouri; United States Geological Survey, Geologic Investigations Series Map, USGS I-2775, scale 1:24000. This report 951 US Census State Borders This report 1448 Kellogg, K.S., and Williams, V.S., 2006, Geologic map of the Ennis 30' x 60' quadrangle, Madison and Gallatin counties, Montana, and Park County, Wyoming: Montana Bureau of Mines and Geology Open-File Report 529, 27 p., 1 sheet, scale 1:100,000. This report 1433 Scarberry, K.C., Elliott, C.G., and Yakovlev, P.V., 2019, Geology of the Butte North 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 715, 30 p., 1 sheet, scale 1:100,000. This report 619 US Census State Borders This report 896 Hintze, L.F., 1980, Geologic map of Utah: Utah Geological and Mineral Survey, Map A-1, scale 1:500,000. This report 1632 Schuster, J.E., 2005, Geologic map of Washington State: Washington Division of Geology and Earth Resources, Geologic Map GM-53, scale 1:500,000. This report 1645 Osborne, W.E., Szabo, M.W., Copeland Jr., C.W., and Neathery, T.L., 1989, Geologic Map of Alabama: Geological Survey of Alabama Special Map 221, scale 1:500,000. This report 1112 US Census State Borders This report 1655 Cleaves, E.T., Edwards, J., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Scale 1:250,000. This report 997 US Census State Borders This report 835 Stewart, J.H, and Carlson, J.E., 1978, Geologic Map of Nevada: U.S. Geological Survey, scale 1:500,000 This report 1664 US Census State Borders This report 962 Reed, R.C., and Daniels, J., compilers., 1987, Bedrock geology of northern Michigan: Michigan Department of Natural Resources, Geological Survey Division, scale 1:500,000. This report 1509 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of the Kalispell 1 x 2 degree quadrangle, Montana, and Alberta and British Columbia: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2267, 2 sheets, scale 1:250,000. This report 632 Berg, T.M., Edmunds, W.E., Geyer, A.R., Glover, A.D., Hoskins, D.M., MacLachlan, D.B., Root, S.I., Sevon, W.D., and Socolow, A.A. 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey Map 1, Scale 1:250,000. This report 212 Dake, C.L., 1929, Geologic map of Potosi-Edgehill [15'] quadrangles [Missouri]; Missouri Geological Survey, Volume, 2nd Series, V-023, scale 1:62500. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 878 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1469 Ruppel, E.T., 1998, Geologic map of the eastern part of the Leadore 30' x 60' quadrangle, Montana and Idaho: Montana Bureau of Mines and Geology Open-File Report 372, 9 p., 1 sheet, scale 1:100,000. This report 568 Harrison, R.W., Orndorff, R.C., and Weary, D.J., 2002, Geologic map of the Stegall Mountain 7.5-minute quadrangle, Shannon and Carter counties, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2767, scale 1:24000. | Weary, D.J., Harrison, R.W., Orndorff, R.C., Weems, R.E., Schindler, J.S., Repetski, J.E., and Pierce, H.A., 2015, Bedrock geologic map of the Spring Valley, West Plains, and parts of the Piedmont and Poplar Bluff 30' x 60' quadrangles, Missouri, including the upper Current River and Eleven Point River drainage basins; United States Geological Survey, Scientific Investigations Map, USGS SIM-3280, scale 1:100000. This report 1423 Vuke, S.M., Berg, R.B., Colton, R.B., and O'Brien, H.E., 2002, Geologic map of the Belt 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 450, 19 p., 2 sheets, scale 1:100,000. This report 1666 Jennings, C.W., Gutierrez, C., Bryant, W., Saucedo, G., and Wills, C., 2010, Geologic Map of California: California Geological Survey Geologic Data Map GDM-2.2010 This report 871 Love, J.D., and Christiansen, A.C., 1985, Geologic map of Wyoming: U.S. Geological Survey, scale 1:500,000 This report 345 Orndorff, R.C., Harrison, R.W., and Weary, D.J., 1999, Geologic map of the Eminence quadrangle, Shannon County, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2653, scale 1:24000. This report 564 Orndorff, R.C., Harrison, R.W., and Weary, D.J., 1999, Geologic map of the Eminence quadrangle, Shannon County, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2653, scale 1:24000. | Weary, D.J. and Orndorff, R.C., 2012, Geologic map of the Alley Spring Quadrangle, Shannon County, Missouri; United States Geological Survey, Scientific Investigations Map, USGS SIM-3161, scale 1:24000. | Weary, D.J., Harrison, R.W., Orndorff, R.C., Weems, R.E., Schindler, J.S., Repetski, J.E., and Pierce, H.A., 2015, Bedrock geologic map of the Spring Valley, West Plains, and parts of the Piedmont and Poplar Bluff 30' x 60' quadrangles, Missouri, including the upper Current River and Eleven Point River drainage basins; United States Geological Survey, Scientific Investigations Map, USGS SIM-3280, scale 1:100000. This report 520 Crane, G.W., 1906, Geologic map of the Bonne Terre 15' quadrangle, Missouri; Missouri Geological Survey, RO0601, scale 1:62500. | Crane, G.W., 1908, Geologic map of the Bonne Terre 15' quadrangle, Missouri; Missouri Geological Survey, Preliminary Map, RO0802, scale 1:62500. | Buckley, E.R., 1908, Geologic and topographic map of the Bonne Terre sheet 15' quadrangle, Missouri; Missouri Geological Survey, Volume, 2nd Series, V-009, part-2, pl-043, RO0802C, scale 1:62500. This report 1471 Harrison, J.E., Cressman, E.R., and Whipple, J.W., 1992, Geologic and structure maps of the Kalispell 1 x 2 degree quadrangle, Montana, and Alberta and British Columbia: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2267, 2 sheets, scale 1:250,000. This report 1103 US Census State Borders This report 1052 US Census State Borders This report 1046 Scott, T.M., Campbell, K.M., Rupert, F.R., Arthur, J.D., Green, R.C., Means, G.H., Missimer, T.M., Lloyd, J.M., Yon, J.W. and Duncan, J.G., 2001, Geologic map of the state of Florida: Florida Geological Survey, Map Series 146, scale 1:1,000,000 (revised 2006). This report 1491 McDonald, C., Lopez, D.A., Berg, R.B., and Gibson, R.I., 2005, Preliminary geologic map of the Ringling 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 511, 27 p., 1 sheet, scale 1:100,000. This report 202 Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 1044 US Census State Borders This report 1463 O'Neill, J.M., and Christiansen, R.L., 2002, Geologic map of the Hebgen Lake 30' x 60' quadrangle, Beaverhead, Madison, and Gallatin counties, Montana, Park and Teton counties, Wyoming, and Clark and Fremont Counties, Idaho: Montana Bureau of Mines and Geology Open-File Report 464, 21 p., 1 sheet, scale 1:100,000. This report 562 Orndorff, R.C., Harrison, R.W., and Weary, D.J., 1999, Geologic map of the Eminence quadrangle, Shannon County, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2653, scale 1:24000. | McDowell, R.C. and Harrison, R.W., 2000, Geologic map of the Powder Mill Ferry quadrangle, Shannon and Reynolds counties, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2722, scale 1:24000. | Orndorff, R.C. and Harrison, R.W., 2001, Geologic map of the Winona quadrangle, Shannon County, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2749, scale 1:24000. | Weary, D.J., Harrison, R.W., Orndorff, R.C., Weems, R.E., Schindler, J.S., Repetski, J.E., and Pierce, H.A., 2015, Bedrock geologic map of the Spring Valley, West Plains, and parts of the Piedmont and Poplar Bluff 30' x 60' quadrangles, Missouri, including the upper Current River and Eleven Point River drainage basins; United States Geological Survey, Scientific Investigations Map, USGS SIM-3280, scale 1:100000. This report 1011 US Census State Borders This report 881 US Census State Borders This report 1638 US Census State Borders This report 409 Harrison, R.W., Orndorff, R.C., and Weary, D.J., 2002, Geologic map of the Stegall Mountain 7.5-minute quadrangle, Shannon and Carter counties, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2767, scale 1:24000. This report 1073 Noger, M.C., 1988, Geologic map of Kentucky: U.S. Geological Survey, scale 1:500,000. This report 528 Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. | Stewart, D.R. and Aid, Kenneth, 1951, Geologic map of the Fredericktown 15' quadrangle, Missouri; Missouri Geological Survey, RO5106, scale 1:48000. This report 788 US Census State Borders This report 623 Slucher, E.R., Swinford, E.M., Larsen, G.E., Schumacher, G.A., Shrake, D.L., Rice, C.L., Caudill, M.R., Rea, R.G., and Powers, D.M., 2006, Bedrock geologic map of Ohio: Ohio Division of Geological Survey, Map BG-1, scale 1:500,000. This report 907 US Census State Borders This report 1029 US Census State Borders This report 614 Rickard, L.V., Isachsen, Y.W., and Fisher, D.W., 1970, Geologic Map of New York: New York State Museum and Science Service Map and Chart Series 15 (Explanatory sheet published in 1971), 5 sheets, scale 1:250,000 This report 941 US Census State Borders This report 999 Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Series Map I-2185, scale: 1:500,000 This report 666 Ratcliffe, N.M., Stanley, R.S., Gale, M.H., Thompson, P.J., Walsh, G.J., Hatch, N.L., Rankin, D.W., Doolan, B.L., Kim, Jonathan, Mehrtens, C.J., Aleinikoff, J.N., McHone, J.G., and Masonic, L.M., 2011, Bedrock Geologic Map of Vermont: U.S. Geological Survey Scientific Investigations Map SIM-3184, scale 1:100,000. This report 936 This Report This report 1443 Ruppel, E.T., O'Neill, J.M., and Lopez, D.A., 1993, Geologic map of the Dillon 1 x 2 degree quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Geologic Investigations Map 1803-H, 1 sheet, scale 1:250,000. This report 1453 Berg, R.B., Lonn, J.D., and Locke, W.W., 1999, Geologic map of the Gardiner 30' x 60' quadrangle, south-central Montana: Montana Bureau of Mines and Geology Open-File Report 387, 11 p., 1 sheet, scale 1:100,000. This report 1522 US Census State Borders This report 1496 Lewis, R.S., Burmester, R.F., Breckenridge, R.M., McFaddan, M.D., and Phillips, W.M., 2008, Preliminary geologic map of the Sandpoint 30' x 60' quadrangle, Idaho and Montana, and the Idaho part of the Chewelah 30' x 60' quadrangle: Idaho Geological Survey, Digital Web Map DWM-94, scale 1:100,000. This report 664 US Census State Borders This report 1639 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1500 Mudge, M.R., Earhart, R.L., Whipple, J.W., and Harrison, J.E., 1983, Geologic and structure maps of the Choteau 1 x 2 degree quadrangle, northwestern Montana: Montana Bureau of Mines and Geology Montana Atlas 3-A, 2 sheets, scale 1:250,000. This report 347 Brown, V.M., 1983, Geology [of exposed Precambrian rocks] of the Des Arc NE 7 1/2' quadrangle, southeast Missouri; Missouri Geological Survey, Open-File Map, OFM-84-198-GI, scale 1:24000. This report 530 Walker, T.H., 1942, Bedrock geologic map of the northwest quarter of the Ironton 15' quadrangle, Missouri; Missouri Geological Survey, RO4205, scale 1:48000. | Berry, A.W., Jr., 1970, Geologic map of a portion of the Taum Sauk Caldera, St. Francois Mountains, Missouri; Missouri Geological Survey, RO7001, scale 1:24000. | McCracken, Mary H., 1971, Structural features of Missouri; Missouri Geological Survey and Water Resources, RI-049, vi+99 p., 1 pl., 11 figs. This report 843 US Census State Borders This report 816 Jirsa, M.A., Boerboom, T.J., and Chandler, V.W., 2012, Geologic Map of Minnesota, Precambrian bedrock geology: Minnesota Geological Survey State Map Series S-22, scale 1:500,000. This report 1479 Lonn, J.D., McDonald, C., Sears, J.W., and Smith, L.N., 2010, Geologic map of the Missoula East 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 593, 2 sheets, scale 1:100,000. This report 337 Robertson, F.S., 1961, Precambrian geology of the St. Francois Mountains in the Ironton 15' quadrangle, Missouri; Missouri Geological Survey, RO6101, scale 1:62500. | Marko, P.J., 1964, Geologic map of the Knoblick area, St. Francois County, Missouri; Missouri Geological Survey, RO6401, scale 1:31700. This report 1095 Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic map of South Dakota: South Dakota Geological Survey General Map G-10, scale 1:500,000. This report 908 Virginia Division of Mineral Resources, 1993, Geologic map of Virginia, Virginia Division of Mineral Resources, series unknown, 1:500,000. This report 848 North Carolina Geological Survey, 1985, Geologic map of North Carolina: North Carolina Geological Survey General Geologic Map, scale 1:500,000. This report 225 Berry, A.W., Jr., 1976, Geologic map of the western portion of the Taum Sauk caldera, St. Francois Mountains, Missouri; Missouri Geological Survey, Report of Investigations, RI-061, RO7603, scale 1:90000. This report 1442 Vuke, S.M., 2014, Preliminary geologic map of the Dearborn River 30' x 60' quadrangle, west-central Montana: Montana Bureau of Mines and Geology Open-File Report 649, 9 p., 1 sheet, scale 1:100,000. This report 1444 Bergantino, R.N., 2001, Geologic map of the Dodson 30' x 60' quadrangle, north-central Montana: Montana Bureau of Mines and Geology Open-File Report 439, 9 p., 1 sheet, scale 1:100,000. This report 1424 Porter, K.W., Wilde, E.M., and Vuke, S.M., 1996, Preliminary geologic map of the Big Snowy Mountains 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 341, 16 p., 1 sheet, scale 1:100,000. This report 1517 Porter, K.W., and Wilde, E.M., 2001, Geologic map of the Zortman 30' x 60' quadrangle, central Montana: Montana Bureau of Mines and Geology Open-File Report 438, 16 p., 1 sheet, scale 1:100,000. This report 940 Witzke, B.J., Anderson, R.R., and Pope, J.P., 2010, Bedrock Geologic Map of Iowa: Iowa Geological Survey Open-File Map OFM-2010-01, scale 1:500,000. This report 334 Robertson, F.S., 1961, Precambrian geology of the St. Francois Mountains in the Ironton 15' quadrangle, Missouri; Missouri Geological Survey, RO6101, scale 1:62500. This report 1656 US Census State Borders This report 783 Sims, P.K., Bankey, V., Finn, C.A., 2001, Preliminary Precambrian basement map of Colorado-a geologic interpretation of the aeromagnetic anomaly map: U.S. Geological Survey Open-File Report 01-364, scale 1:1,000,000 This report 655 Tomhave, D.W., and Schulz, L.D., 2004, Bedrock geologic map showing configuration of the bedrock surface in South Dakota east of the Missouri River: South Dakota Geological Survey General Map 9, scale 1:500,000 This report 932 US Census State Borders This report 606 Tiger US State 2021 (tl_2021_us_state.SHP) This report 1472 Lonn, J.D., Skipp, B., Ruppel, E.T., Janecke, S.U., Perry Jr., W.J., Sears, J.W., Bartholomew, M.J., Stickney, M.C., Fritz, W.J., Hurlow, H.A., and Thomas, R.C., 2000, Geologic map of the Lima 30' x 60' quadrangle, southwest Montana: Montana Bureau of Mines and Geology Open-File Report 408, 42 p., 2 sheets, scale 1:100,000. This report 1035 Tweto, Ogden, 1979, Geologic map of Colorado: U.S. Geological Survey, scale 1:500,000 This report 371 Nusbaum, R.L., 1978, [Bedrock geologic map of the Iron Mountain Lake 7.5' quadrangle, Missouri]; Missouri Geological Survey, RO7813B, scale 1:24000. This report 1435 Reynolds, M.W., and Brandt, T.R., 2005, Geologic map of the Canyon Ferry Dam 30' x 60' quadrangle, west-central Montana: U.S. Geological Survey Scientific Investigations Map 2860, 32 p., 3 sheets, scale 1:100,000. . This report 1498 Mudge, M.R., Earhart, R.L., Whipple, J.W., and Harrison, J.E., 1983, Geologic and structure maps of the Choteau 1 x 2 degree quadrangle, northwestern Montana: Montana Bureau of Mines and Geology Montana Atlas 3-A, 2 sheets, scale 1:250,000. This report 339 Marko, P.J., 1964, Geologic map of the Knoblick area, St. Francois County, Missouri; Missouri Geological Survey, RO6401, scale 1:31700. | Stewart, D.R. and Aid, Kenneth, 1943, Preliminary geologic map of the Fredericktown district, Missouri; Missouri Geological Survey, Manuscript file, MSC-1535, RO4301, scale 1:62500. This report 596 US Census State Borders This report 368 Robertson, F.S., 1961, Precambrian geology of the St. Francois Mountains in the Ironton 15' quadrangle, Missouri; Missouri Geological Survey, RO6101, scale 1:62500. | Amos, D.H. and Desborough, G.A., 1970, Geologic map of parts of the Ironton and Fredericktown areas, Missouri; Missouri Geological Survey, Report of Investigations, RI-047, pl-1, RO7003, scale 1:36000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 1507 Lonn, J.D., and McFaddan, M.D., 1999, Geologic map of the Montana part of the Wallace 30' x 60' quadrangle: Montana Bureau of Mines and Geology Open-File Report 388, 15 p., 2 sheets, scale 1:100,000. This report 649 US Census State Borders This report 1065 Kansas Geological Survey, 2008, Surficial Geology of Kansas: Kansas Geological Survey, Map M-118, scale 1:500,000 This report 2 Starbuck, E.A., 2017, Geologic map of Missouri, 2017; Missouri Geological Survey, GM-02-2017, scale 1:500000. This report 338 Marko, P.J., 1964, Geologic map of the Knoblick area, St. Francois County, Missouri; Missouri Geological Survey, RO6401, scale 1:31700. This report 877 US Census State Borders This report 794 Anderson, R., 2006, Geology of the Precambrian surface of Iowa and surrounding area: Iowa Geological Survey Open File Map OFM-06-7, scale 1:1,000,000. This report 342 Lemmon, R.D., 1964, Areal geologic map of the Slabtown Granite in the Fredericktown 15' quadrangle, Missouri; Missouri Geological Survey, RO6403, scale 1:43700. This report 1494 Lonn,J.D., Elliott, C.G., Lewis, R.S., Burmester, R.F., McFaddan, M.D., Stanford, L.R., and Jänecke, S.U., 2019, Geologic map of the Montana part of the Salmon 30' x 60' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Geologic Map 75, 28 p., 1 sheet, scale 1:100,000. This report 1005 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 527 Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. | Satterfield, I.R., 1980, Reconnaissance geologic map of the Higdon 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO8003, scale 1:24000. | Satterfield, I.R., 1980, Reconnaissance geologic map of the Hurricane 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO8004, scale 1:24000. | Satterfield, I.R., 1981, Geologic map of the Higdon 15' quadrangle, Missouri; Missouri Geological Survey, RO8103, scale 1:62500. This report 1021 US Census State Borders This report 847 US Census State Borders This report 435 McDowell, R.C. and Harrison, R.W., 1998, Geologic map of the Powder Mill Ferry 7 1/2' quadrangle, Shannon and Reynolds counties, Missouri; Missouri Geological Survey, RO9803, scale 1:24000. This report 1076 US Census State Borders This report 221 Sides, J.R., 1983, Geologic map of exposed Precambrian rocks in the Lake Killarney quadrangle, Missouri [7.5]; Missouri Geological Survey, Open-File Map, OFM-83-162-MR, scale 1:24000. This report 439 Weary, D.J., Harrison, R.W., Orndorff, R.C., Weems, R.E., Schindler, J.S., Repetski, J.E., and Pierce, H.A., 2015, Bedrock geologic map of the Spring Valley, West Plains, and parts of the Piedmont and Poplar Bluff 30' x 60' quadrangles, Missouri, including the upper Current River and Eleven Point River drainage basins; United States Geological Survey, Scientific Investigations Map, USGS SIM-3280, scale 1:100000. This report 1084 Snead, J.I., and McCulloh, R.P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey Geologic Map 5, scale 1:500,000. This report 887 Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000. This report 952 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 854 US Census State Borders This report 1067 US Census State Borders This report 1508 Reynolds, M.W., and Brandt, T.R., 2007, Preliminary geologic map of the White Sulphur Springs 30' x 60' quadrangle, Montana: U.S. Geological Survey Open-File Report 2006-1329, scale 1:100,000. This report 968 US Census State Borders This report 1431 Lopez, D.A., 2000, Geologic map of the Bridger 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 58, 1 sheet, scale 1:100,000. This report 1474 Vuke, S.M., Wilde, E.M., Lopez, D.A., and Bergantino, R.N., 2000, Geologic map of the Lodge Grass 30' x 60' quadrangle, Montana: Montana Bureau of Mines and Geology Geologic Map 56, 1 sheet, scale 1:100,000. This report 567 Harrison, R.W., Orndorff, R.C., and Weary, D.J., 2002, Geologic map of the Stegall Mountain 7.5-minute quadrangle, Shannon and Carter counties, Missouri; United States Geological Survey, Geologic Investigations Series, USGS I-2767, scale 1:24000. | Weary, D.J. and Weems, R.E., 2005, Geologic map of the Van Buren North quadrangle, Carter, Reynolds, and Shannon Counties, Missouri; United States Geological Survey, Geologic Investigations Series Map, USGS I-2802, scale 1:24000. This report 343 Corbitt, L.L., 1966, Geologic map of the Butler Hill Granite area in southeast Missouri; Missouri Geological Survey, RO6601, scale 1:20000. This report 1434 McDonald, C., Elliott, C.G., Vuke, S.M., Lonn, J.D., and Berg, R.B., 2012, Geologic map of the Butte South 30' x 60' quadrangle, southwestern Montana: Montana Bureau of Mines and Geology Open-File Report 622, 1 sheet, scale 1:100,000. This report 1484 Lonn, J.D., McDonald, C., Lewis, R.S., Kalakay, T.J., O'Neill, J.M., Berg, R.B., and Hargrave, P., 2003, Geologic map of the Philipsburg 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 483, 1 sheet, scale 1:100,000. This report 1485 Lonn, J.D., Smith, L.N., and McCulloch, R.B., 2007, Geologic map of the Plains 30' x 60' quadrangle, western Montana: Montana Bureau of Mines and Geology Open-File Report 554, 43 p., 1 sheet, scale 1:100,000. This report 827 Sims, P.K., O'Neill, J.M., Bankey, V., and Anderson, E., 2004, Precambrian basement geologic map of Montana -- an interpretation of aeromagnetic anomalies: U.S. Geological Survey, Scientific Investigations Map SIM-2829, scale 1:1,000,000. This report 197 Stewart, D.R. and Aid, Kenneth, 1951, Geologic map of the Fredericktown 15' quadrangle, Missouri; Missouri Geological Survey, RO5106, scale 1:48000. | Stewart, D.R. and Aid, Kenneth, 1943, Preliminary geologic map of the Fredericktown district, Missouri; Missouri Geological Survey, Manuscript file, MSC-1535, RO4301, scale 1:62500. | McCracken, Mary H., 1971, Structural features of Missouri; Missouri Geological Survey and Water Resources, RI-049, vi+99 p., 1 pl., 11 figs. | Satterfield, I.R., 1980, Reconnaissance geologic map of the Higdon 7 1/2' quadrangle, Missouri; Missouri Geological Survey, RO8003, scale 1:24000. | Pratt, W.P., Middendorf, M.A., Satterfield, I.R., and Gerdemann, P.E., 1992, Geologic map of the Rolla 1° X 2° quadrangle, Missouri [color]; United States Geological Survey, Miscellaneous Investigations Series Map, USGS I-1998, scale 1:250000. This report 1464 Harrison, J.E., Whipple, J.W., and Lidke, D.J., 1998, Geologic map of the western part of the Cut Bank 1 x 2 degree quadrangle, northwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Map 2593, 1 sheet, scale 1:250,000. This report 636 U.S. Geological Survey, 2014, USGS Small-scale Dataset - 1:1,000,000-Scale Coastline of the United States 201403 Shapefile: U.S. Geological Survey Data Release, https://www.sciencebase.gov/catalog/item/581d051de4b08da350d523be. This report 1480 Lewis, R.S., 1998, Preliminary geologic map of the Montana part of the Missoula West 30' x 60' quadrangle: Montana Bureau of Mines and Geology Open-File Report 373, 20 p., 1 sheet, scale 1:100,000. This report 994 McCormick, K.A., 2010, Precambrian Basement Terrane of South Dakota: South Dakota Geological Survey Bulletin 41, 2 Plates, Scale 1:1,000,000. This report 336 Anderson, R.E., 1962, Geologic map of Precambrian igneous rocks in the Taum Sauk area, Missouri; Missouri Geological Survey, RO6203, scale 1:62500. | Berry, A.W., Jr., 1976, Geologic map of the western portion of the Taum Sauk caldera, St. Francois Mountains, Missouri; Missouri Geological Survey, Report of Investigations, RI-061, RO7603, scale 1:90000. This report 589 US Census State Borders This report 1652 Lewis, R.S., Link, P.K., Stanford, L.R., and Long, S.P., 2012, Geologic map of Idaho: Idaho Geological Survey, Map M-9, scale 1:750,000. This report Notes Additional information specific to a particular feature or table entry. GeMS Unrepresentable domain. Free text. Values of <null> or #null indicate no entry. ContactsAndFaults_ID Primary key. GeMS Arbitrary string. Values should be unique within this database. MapSourceID Identifies source map. Foreign key to DataSources table. This Report Unrepresentable domain MapUnitLines Lines that record distribution of map units of narrow, linear extent on the particular map horizon. In the original file geodatabase, this dataset is found within the GeologicMap feature dataset. GeMS OBJECTID Internal feature number ESRI Unrepresentable domain Shape Internal geometry object ESRI Unrepresentable domain Shape_Length Internal feature length, double ESRI Unrepresentable domain MapUnit Short plain-text identifier of the map unit. Foreign key to DescriptionOfMapUnits table. GeMS PRu Undifferentiated Proterozoic rocks This Report CAZms Metasedimentary rocks This Report PHs Phanerozoic cover rocks This Report Zm Metamorphic and igneous rocks This Report Zms Metasedimentary rocks This Report PZpCmg Metaigneous rocks This Report Aif Iron formation This Report Xif Iron formation This Report IsConcealed Flag for contacts and faults covered by overlying map unit. GeMS Unrepresentable domain LocationConfidenceMeters Estimated half-width in meters of positional uncertainty envelope; position is relative to other features in database. GeMS Positive real number. Value of -9, -99, or -999 indicates value is unknown. ExistenceConfidence Confidence that feature exists. GeMS certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. IdentityConfidence Confidence that feature is correctly identified. GeMS certain Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. Label Plain-text equivalent of the desired annotation for a feature: for example "14 Ma", or "^c" which (when used with the FGDC GeoAge font) results in the geologic map-unit label TRc (with TR run together to make the Triassic symbol). GeMS Unrepresentable domain Symbol Reference to a point marker, line symbol, or area-fill symbol that is used on the map graphic to denote the feature: perhaps a star for a K-Ar age locality, or a heavy black line for a fault. GeMS Unrepresentable domain PlotAtScale At what scale (or larger) should this observation or analysis be plotted? At smaller scales, it should not be plotted. Useful to prevent crowding of display at small scales and to display progressively more data at larger and larger scales. Value is scale denominator. GeMS Positive real number. DataSourceID Source of data; foreign key to table DataSources. GeMS 816 Jirsa, M.A., Boerboom, T.J., and Chandler, V.W., 2012, Geologic Map of Minnesota, Precambrian bedrock geology: Minnesota Geological Survey State Map Series S-22, scale 1:500,000. This report 1645 Osborne, W.E., Szabo, M.W., Copeland Jr., C.W., and Neathery, T.L., 1989, Geologic Map of Alabama: Geological Survey of Alabama Special Map 221, scale 1:500,000. This report 1095 Martin, J.E., Sawyer, J.F., Fahrenbach, M.D., Tomhave, D.W., and Schulz, L.D., 2004, Geologic map of South Dakota: South Dakota Geological Survey General Map G-10, scale 1:500,000. This report 1091 Thompson, D.E., 2011, Geologic Map of Mississippi; after Bickler, A.R., 1969, Geologic Map of Mississippi: Mississippi Department of Environmental Quality, Office of Geology, scale 1:500,000. This report 908 Virginia Division of Mineral Resources, 1993, Geologic map of Virginia, Virginia Division of Mineral Resources, series unknown, 1:500,000. This report 623 Slucher, E.R., Swinford, E.M., Larsen, G.E., Schumacher, G.A., Shrake, D.L., Rice, C.L., Caudill, M.R., Rea, R.G., and Powers, D.M., 2006, Bedrock geologic map of Ohio: Ohio Division of Geological Survey, Map BG-1, scale 1:500,000. This report 1073 Noger, M.C., 1988, Geologic map of Kentucky: U.S. Geological Survey, scale 1:500,000. This report 1055 Lawton, D.E., Moye, F.J., Murray, J.B., O'Connor, B.J., Penley, H.M., Sandrock, G.S., Marsalis, W.E., Friddell, M.S., Hetrick, J.H., Huddlestun, P.F., Hunter, R.E., Mann, W.R., Martin, B.F., Pickering, S.M., Schneeberger, F.J., and Wilson, J.D., 1976, Geologic map of Georgia: Georgia Geological Survey, scale 1:500,000 This report 935 Gray, H.H., Ault, C.H., and Keller, S.J., 1987, Bedrock geologic map of Indiana: Indiana Geological Survey Miscellaneous Map 48, scale 1:500,000 This report Notes Additional information specific to a particular feature or table entry. GeMS Unrepresentable domain. Free text. Values of <null> or #null indicate no entry. MapUnitLines_ID Primary key. GeMS Arbitrary string. Values should be unique within this database. MapSourceID Identifies source map. Foreign key to DataSources table. This Report Unrepresentable domain Source_MapUnit Short, easily understood ASCII-character identifier for the source map unit. Prefixed with a MapSourceID value (from Source_DescriptionOfMapUnits) to differentiate identically-named source map units from different source maps. Otherwise conceptually equivalent to the "MapUnit" field in the GeMS "DescriptionOfMapUnits" table. This Report Unrepresentable domain U.S. Geological Survey NGMDB mailing

12201 Sunrise Valley Dr., MS 908

Reston VA 20192 NA ngmdb@usgs.gov Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Digital Data https://doi.org/10.5066/P13TSV2J None 20250403 U.S. Geological Survey NGMDB mailing

12201 Sunrise Valley Dr., MS 908

Reston VA 20192 NA ngmdb@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999