Michelle A. Roberts Taylor C. Team Donald S. Sweetkind Victoria E. Langenheim Joanna R. Redwine 2025 Geodatabase, shapefile, CSV Moffett Field, CA U.S. Geological Survey https://doi.org/10.5066/P14PZQU6 This preliminary geospatial dataset compiles, in digital form, geologic and geophysical data for the Portola 30’x 60’ quadrangle, located in the northern Sierra Nevada, California. The geologic map of the Portola 30’x 60’ quadrangle integrates decades of published and unpublished mapping in the northern Sierra Nevada. In conjunction with geophysical data, including more than 1000 new gravity measurements and new detailed aeromagnetic data, the map seamlessly depicts a complex region at the intersection of the Sierra Nevada and Basin and Range provinces. All geologic data were compiled as a GeMS digital database; geophysical data were converted to a GeMS schema. This preliminary database will be superseded by an updated database that will accompany a USGS Scientific Investigation Map (SIM), which has been scientifically reviewed and is in the final editing stages prior to its publication. When that process concludes, the content of the database will be updated to reflect any changes to the map manuscript that occurred during final editing. The dataset includes a geographic information system geodatabase that contains mapped contacts and faults, map unit polygons, orientation points of recorded field observations, and polyline features of mapped intrusive dikes. Vector data are attributed according to the USGS National Cooperative Geologic Mapping Program’s GeMS digital geologic map schema. The spatial data are accompanied by non-spatial tables that describe the sources of geologic information, a description of geologic map units, a glossary of terms, and a Data Dictionary that duplicates the Entity and Attribute information contained in the metadata file. Rocks in the Portola 30’ by 60’ quadrangle record late Paleozoic through Mesozoic terrane accretion and amalgamation; they are intruded by Devonian, Jurassic and early Cretaceous plutons, overlain by volcanic rocks with multiple sources and ages, and cut by Cenozoic faults. Such complexity is well suited for geologic depiction at a scale of 100,000 as this scale is able to capture relations and transitions pertinent to the geologic and tectonic framework of the quadrangle. While these relations can be shown on smaller scale maps (1:250,000), this compilation is able to show lithologic variations within these units, as well as structural data, that may aid in the interpretation of these features. Larger scale maps (1:62,500 to 1:24,000) can only show parts of the various tectonic features. Most of the previous geologic mapping in the Portola 30’ by 60’ quadrangle did not have existing digital data and had to be hand digitized. These include dissertation maps from Edelman (1986), Phillipson (1995), and Sheeks (2016). Redwine’s (2013) map of Mohawk Valley included digital data, which had to be simplified for the 1:100,000 scale. Scanned paper maps were georeferenced and digitized using ESRI’s ArcGIS software. Once maps were digital, they were merged into seamless layers of polygons and lines depicting the geology. This process involved looking for general agreement between units and resolving differences through field work or comparing LiDAR data (U.S. Geological Survey, 2017) and aerial imagery from ESRI’s World Imagery collection. Conflicts that were difficult to resolve required careful consideration of stratigraphic or structural trends, as well as scale of original mapping. Glacial moraines are easily mapped from LiDAR (U.S. Geological Survey, 2017), and this mapping has been done by J.L. Redwine (2013) and M.A. Roberts (this study). LiDAR also aids in the mapping of other Quaternary deposits based on their topographic position and morphology. In this heavily vegetated landscape, aerial imagery offered limited aid in mapping. Granitic rocks may be evident on aerial imagery, but differentiating contacts within plutons is not possible with this imagery resolution. Field verification of units with uncertain identities or previous author conflicts was done locally and sites were located using an iPhone GPS. Rock samples were collected from each outcrop for density measurements and magnetic susceptibility; volcanic and plutonic rocks were also collected for geochronology and geochemistry if those data were absent or older age dates needed to be verified. Because of the wide range of previous mapping scales, the heavily vegetated landscape, and interpretive differences among various authors, this map should be used with caution and not beyond its intended 1:100,000 scale. Our goal with this map is to provide a regional geologic framework that may be used by the scientific community, general public, and industry. Gravity and magnetic data are useful for mapping lateral variations in lithology type and bedrock geology beneath cover material. Gravity data are processed to reflect density variations within the upper and middle crust and are particularly well suited for determining the shape of Cenozoic basins because of the significant density contrast between dense Mesozoic and older bedrock rocks units and lighter unconsolidated Cenozoic rocks and deposits. Magnetic data reflect magnetization variations within the crust and are well suited for mapping the distribution of rock types that contain magnetite, such as mafic igneous rocks. Both gravity and magnetic anomalies can be related interpreted to reflect changes in rock type, thereby providing a means to remotely map remotely some aspects of the geology. The Geologic Map geodatabase follows the schema and structure of the USGS National Cooperative Geologic Mapping Program’s GeMS digital geologic map data standard [https://ngmdb.usgs.gov/Info/standards/GeMS/]. In ArcGIS Pro, all feature classes may be symbolized by the attribute field "Symbol" by matching symbols to a style using the ArcGIS Pro style implementation of FGDC Standard which may be downloaded at https://ngmdb.usgs.gov/Info/standards/GeMS/ 2024 publication date Complete None planned -121.0000 -120.0000 40.0000 39.5000 ISO 19115 Topic Category geoscientificInformation elevation USGS Thesaurus geology elevation fault quadrangle GeMS dike gravity aeromagnetic Geolex Mohawk Sierra Buttes Bonta Ingalls Penman Dixie Antelope Taylor Bowman Shoo Fly Peale Goodhue Reeve Sailor Canyon Lovejoy USGS Metadata Identifier USGS:0ddcbdb2-248a-4503-988c-f8c661670e10 USGS Persistent Identifier (PID) Common geographic areas California Portola Sierra Nevada Long Valley Feather River Loyalton Chilcoot Plumas Sierra Valley Sierra Buttes Lakes Basin Quincy Sierra City Downieville La Porte None. Please see 'Distribution Info' for details. 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. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Michelle A Roberts USGS - SOUTHWEST REGION Geologist mailing and physical

NASA AMES-Moffett Field,Moffett Field - Building 19

Moffett Field CA 94035 650-329-4908 roberts@usgs.gov Project supported by funding from the USGS National Cooperative Geologic Mapping Program. Author credits: Michelle Roberts digitized the faults, folds, and structure contours from most of the source maps, computed the orientation data, partially attributed the feature datasets, and partially created the nonspatial tables. Don Sweetkind also contributed to the nonspatial tables as well as review of geodatabase functionality. Taylor Team completed the nonspatial tables, attribute fields, fixed topological errors, and revised and validated the dataset to be compliant with the GeMS data schema, and wrote metadata. Joanna Redwine provided GIS files for Quaternary mapping in the Mohawk Valley region, and Victoria Langenheim provided the geophysical data (gravity and aeromagnetic data). Data produced using Windows 10 Enterprise ArcGIS Pro 3.2.2 files: Portola_GeMS.gdb (ESRI geodatabase file, 8.75 MB). PORT_GeMS_Shapefiles.zip Microsoft Excel files: DataSources.xlsx and .csv (17 KB), DescriptionOfMapUnits.xlsx and .csv (88 KB), Glossary.xlsx and .csv (15 KB), Metadata Wizard v2.0.7 file: PORT_GeMS_metadata.xml (XX KB) No formal attribute accuracy tests were conducted. Verification was done by interactive on-screen review. Map elements and topology were checked if needed. Dataset is considered complete for the information presented. A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted. Mapped geologic polygons were visually compared to hillshade maps generated from digital elevation models. Locational certainty for contacts and faults are varied based on scale of the original map. Scales ranged from 1:12,000 to 1:250,000. Overall positional accuracy was deemed acceptable for intended purpose as a regional-scale map. A formal accuracy assessment of the vertical positional information in the dataset has not been conducted. Brooks, E.R., Wood, M.M., Boehme, D.R., Potter, K.L., and Marcus, B.I. 2003 publication Map Sheet MS-055.1 n/a California Geological Survey https://ngmdb.usgs.gov/Prodesc/proddesc_62940.htm 12000 Digital and/or Hardcopy 2003 publication date Brooks et al., 2003 Source of geologic contacts and map polygons, faults and orientation points Brooks, E.R., Henry, D.C., and Faulds, J.E. 2008 publication n/a Califormia Geological Survey Digital and/or Hardcopy 2008 publication date Brooks et al., 2008 Source of geologic contacts and map polygons, faults and orientation points Edelman, S.H. 1986 tabular digital data Davis, California University of California, Davis Ph.D thesis Digital and/or Hardcopy 1986 publication date Edelman, 1986 Source of geologic contacts and map polygons, faults and orientation points Gold, R.D., Stephenson, W.J., Odum, J.K., Briggs, R.W., Crone, A.J., and Angster, S.J. 2013 publication n/a Journal of Geophysical Research: Solid Earth Gold, R. D., W. J. Stephenson, J. K. Odum, R. W. Briggs, A. J. Crone, and S. J. Angster (2013), Concealed Quaternary strike-slip fault resolved with airborne lidar and seismic reflection: The Grizzly Valley fault system, northern Walker Lane, California, J. Geophys. Res. Solid Earth, 118, 3753–3766, doi:10.1002/jgrb.50238. https://doi.org/10.1002/jgrb.50238 Digital and/or Hardcopy 2013 publication date Gold et al., 2013 Source of modifications to previously mapped faults Gold, R.D., Briggs, R.W., Personius, S.F., Crone, A.J., Mahan, S.A., and Angster, S.J. 2014 publication n/a Journal of Geophysical Research: Solid Earth Gold, R. D., R. W. Briggs, S. F. Personius, A. J. Crone, S. A. Mahan, and S. J. Angster (2014), Latest Quaternary paleoseismology and evidence of distributed dextral shear along the Mohawk Valley fault zone, northern Walker Lane, California, J. Geophys. Res. Solid Earth, 119, 5014–5032, doi:10.1002/2014JB010987. https://doi.org/10.1002/2014JB010987 Digital and/or Hardcopy 2014 publication date Gold et al., 2014 Source of modifications to previously mapped faults Grose, T.L.T., Durrell, C., D'Allura, J.A., Moar, R.R., Saucedo, G.J., and Little, J.D. 2000 publication Open-File Report OFR-2000-21 n/a California Division of Mines and Geology https://ngmdb.usgs.gov/Prodesc/proddesc_63096.htm 62500 Digital and/or Hardcopy 2000 publication date Grose et al., 2000a Source of geologic contacts and map polygons, faults and orientation points Grose, T.L.T., Moar, R.R., Saucedo, G.J., and Little, J.D. 2000 publication Open-File Report OFR-2000-22 n/a California Division of Mines and Geology https://ngmdb.usgs.gov/Prodesc/proddesc_63095.htm 62500 Digital and/or Hardcopy 2000 publication date Grose et al., 2000b Source of geologic contacts and map polygons, faults and orientation points Grose, T.L.T., Moar, R.R., Saucedo, G.J., and Little, J.D. 2000 publication Open-File Report OFR-2000-25 n/a California Division of Mines and Geology https://ngmdb.usgs.gov/Prodesc/proddesc_63118.htm 62500 Digital and/or Hardcopy 2000 publication date Grose et al., 2000c Source of geologic contacts and map polygons, faults and orientation points Grose, T.L.T., Moar, R.R., Saucedo, G.J., and Little, J.D. 2000 publication Open-File Report OFR-2000-24 n/a California Division of Mines and Geology https://ngmdb.usgs.gov/Prodesc/proddesc_63117.htm 62500 Digital and/or Hardcopy 2000 publication date Grose et al., 2000d Source of geologic contacts and map polygons, faults and orientation points Grose, T.L.T., Mergner, M., Moar, R.R., Saucedo, G.J., and Little, J.D. 2000 publication Open-File Report OFR-2000-23 n/a California Division of Mines and Geology https://ngmdb.usgs.gov/Prodesc/proddesc_63094.htm 62500 Digital and/or Hardcopy 2000 publication date Grose et al., 2000e Source of geologic contacts and map polygons, faults and orientation points Hanson, R.E. 2024 tabular digital data n/a n/a Unpublished field notes Digital and/or Hardcopy 2024 observed Hanson field notes Modifications to previously mapped areas. Hanson, R.E., and Schweickert, R.A. 2024 vector digital data n/a n/a Unpublished mapping Digital and/or Hardcopy 2024 observed Hanson and Schweickert, unpublished Modifications to previously mapped areas. Harwood, D.S. 2024 vector digital data n/a n/a Unpublished mapping Digital and/or Hardcopy 2024 observed Harwood, unpublished Modifications to previously mapped areas. Hietanen, A. 1981 publication Professional Paper 1226-A n/a U.S. Geological Survey https://ngmdb.usgs.gov/Prodesc/proddesc_4757.htm 48000 Digital and/or Hardcopy 1981 publication date Hietanen, 1981 Source of geologic contacts and map polygons, faults and orientation points Phillipson, S.E. 1995 publication Fort Worth, Texas Texas Christian University Master's thesis https://repository.tcu.edu/handle/116099117/33180 Digital and/or Hardcopy 1995 publication date Phillipson, 1995 Modifications to previously mapped areas. Redwine, J. 2024 vector digital data n/a n/a Digital and/or Hardcopy 2024 observed Redwine Modifications to previously mapped areas. Roberts, M.A. 2024 publication n/a n/a Digital and/or Hardcopy 2024 observed Roberts (This Study) Modifications to previously mapped features utilizing lidar, aerial photography, or fieldwork. Saucedo, G.J., and Wagner, D.L. 1992 publication Regional Geologic Map RGM-7A n/a California Division of Mines and Geology https://ngmdb.usgs.gov/Prodesc/proddesc_63087.htm 250000 Digital and/or Hardcopy 1992 publication date Saucedo and Wagner, 1992 Source of geologic contacts and map polygons, faults and orientation points Sheeks, D.I. 2016 publication n/a University of California, Davis Master's thesis https://escholarship.org/uc/item/5b96z99q 24000 Digital and/or Hardcopy 2016 publication date Sheeks, 2016 Source of geologic contacts and map polygons, faults and orientation points USGS 2024 raster digital data n/a USGS 100000 Digital and/or Hardcopy 2024 ground condition Portola 100k basemap Topographic basemap USGS 2024 raster digital data n/a USGS 62500 Digital and/or Hardcopy 2024 ground condition Sierra City 62.5k basemap Topographic basemap Pierce, I., and Koehler, R. 2023 publication n/a Seismica Pierce, I., & Koehler, R. (2023). 3D Paleoseismology from iOS Lidar and Structure from Motion Photogrammetry: a case study on the Dog Valley fault, California. Seismica, 2(1). https://doi.org/10.26443/seismica.v2i1.208 https://doi.org/10.26443/seismica.v2i1.208 Digital and/or Hardcopy 2023 publication date Pierce and Koehler, 2023 Source of modifications to previously mapped faults FGDC 2006 publication n/a FGDC https://ngmdb.usgs.gov/fgdc_gds/geolsymstd.php Digital and/or Hardcopy 2006 publication date Federal Geographic Data Committee, 2006 FGDC Cartographic Standards Klaus K. E. Neuendorf, American Geological Institute 2005 publication n/a Springer Science & Business Media https://www.americangeosciences.org/pubs/glossary Digital and/or Hardcopy 2005 publication date American Geosciences Institute Glossary of Geology Source for standard geologic terms Cohen, K.M., Finney, S.C., Gibbard, P.L., and Fan, J.X. 2019 publication n/a International Commission on Stratigraphy Cohen, K.M., Finney, S.C., Gibbard, P.L. & Fan, J.-X. (2013; updated) The ICS International Chronostratigraphic Chart. Episodes 36: 199-204. http://www.stratigraphy.org/ICSchart/ChronostratChart2019-05.pdf Digital and/or Hardcopy 2019 publication date ICS International Chronostratigraphic Chart Reference used for subdivisions of geologic time USGS 2025 application/service n/a USGS https://ngmdb.usgs.gov/Geolex/search Digital and/or Hardcopy 2025 publication date USGS Geologic Names Lexicon Reference used for geologic names Through research, internet searches, and searching the National Geologic Map Database (NGMDB), geologic map sources were assembled, converted to raster format and georeferenced in a GIS. These geologic maps, in addition to topographic basemaps from the USGS, were used to set up the geologic framework for the Portola 30' X 60' Quadrangle. These maps, in addition to other sources used to modify or update previously published geologic information, are cited in the DataSources nonspatial table associated with this release. Brooks et al., 2003 Brooks et al., 2008 Edelman, 1986 Grose et al., 2000a Grose et al., 2000b Grose et al., 2000c Grose et al., 2000d Grose et al., 2000e Hietanen, 1981 Saucedo and Wagner, 1992 Sheeks, 2016 Portola 100k basemap Sierra City 62.5k basemap Phillipson, 1995 Gold et al., 2013 Gold et al., 2014 Pierce and Koehler, 2023 Hanson and Schweickert, unpublished Harwood, unpublished 2024 In a GIS, created the ContactsAndFaults feature class using digitized polylines from source maps. ContactsAndFaults was modified with the addition of unpublished source material and written communication with scientists who have previously worked in the area. Additionally, select faults were modified based on recently publish neotectonic studies. Furthermore, modifications were made using recent LiDAR, aerial imagery, and fieldwork. After modifications to mapped contact and faults were complete, the ContactsAndFaults feature class was attributed using GeMS schema and FGDC symbolization. Topological checks to the linework were subsequently performed, utilizing the following ruleset: Lines must not overlap, lines must not self overlap, lines must not self intersect, and except for faults and concealed contacts, lines must not have dangles. Subsequent corrections to linework were made following revelation of topological errors. Brooks et al., 2003 Brooks et al., 2008 Edelman, 1986 Gold et al., 2013 Gold et al., 2014 Grose et al., 2000a Grose et al., 2000b Grose et al., 2000c Grose et al., 2000d Grose et al., 2000e Hanson field notes Hanson and Schweickert, unpublished Harwood, unpublished Hietanen, 1981 Phillipson, 1995 Redwine Roberts (This Study) Saucedo and Wagner, 1992 Sheeks, 2016 Portola 100k basemap Sierra City 62.5k basemap Pierce and Koehler, 2023 Federal Geographic Data Committee, 2006 2024 Geologic units were compiled as mapped on the source geologic maps into a nonspatial DescriptionOfMapUnits table using the DescriptionOfMapUnits from each source geologic map, plus data from the National Geologic Map Database’s Geologic Names Lexicon to populate details of each unit. Created point feature class MapUnitPolyLabel so that each polygon could be attributed and labeled with data from the DescriptionOfMapUnits table. Brooks et al., 2003 Brooks et al., 2008 Edelman, 1986 Grose et al., 2000a Grose et al., 2000b Grose et al., 2000c Grose et al., 2000d Grose et al., 2000e Hanson and Schweickert, unpublished Harwood, unpublished Hietanen, 1981 Phillipson, 1995 Redwine Roberts (This Study) Sheeks, 2016 Portola 100k basemap ICS International Chronostratigraphic Chart USGS Geologic Names Lexicon 2024 In a GIS, orientation data were created in a point feature class: OrientationPoints, digitized from source maps where present. In a GIS editing session, features were attributed to GeMS schema, symbolized to FGDC standards, and rotated based on the strike provided in azimuth field from the attribute table. Edelman, 1986 Grose et al., 2000a Grose et al., 2000b Grose et al., 2000c Grose et al., 2000e Hanson and Schweickert, unpublished Hietanen, 1981 Phillipson, 1995 Sheeks, 2016 2024 In a GIS, additional polyline data, representing previously mapped dikes, were created in a feature class: GeologicLines, digitized from source maps where present. In a GIS editing session, features were attributed to GeMS schema and symbolized to FGDC standards. Grose et al., 2000a Grose et al., 2000b Grose et al., 2000c Grose et al., 2000d Grose et al., 2000e Hietanen, 1981 2024 In a GIS, used “Feature to Polygons” tool to create geologic map polygons, in the MapUnitPolys feature class, from the ContactsAndFaults polyline feature class using point feature class MapUnitPolyLabel to label polygons. Created topology rules for the MapUnitPolys polygon feature class. For the MapUnitPolys feature class, topology rules included: Polygons must not overlap, must not have gaps, boundary must be covered by (topologically, not simply cartographically) lines in the ContactsAndFaults feature class. Polygons were created multiple times, successively fixing topology errors until the dataset was free of topological errors. 2024 Compiled and added the Glossary nonspatial table, that explains “Type” terms used in attribute tables, in addition to the GeoMaterialDict nonspatial table using the GeMS toolbox, to the geodatabase. 2024 Created a metadata file for the dataset, ran metadata validation and corrected FGDC errors until the metadata validated as free of FGDC errors. 2024 In a GIS, used the National Geologic Map Database’s “GeMS toolbox (2/11/2025 release)” to run the GeMS Validate Database tool that is part of the GeMS Tools ArcGIS toolbox of geoprocessing tools. The validation tool understands custom name variations of GeMS elements, validates and checks an existing topology if it exists; checks standalone metadata file, and checks internal consistency and format within the database. The validation tool was run repeatedly until no validation errors were reported. 2024 Used the National Geologic Map Database’s “GeMS toolbox” to run the GeoLex Geologic Names Check tool that is part of the GeMS Tools ArcGIS toolbox of geoprocessing tools. This tool provides a cursory check of formal geologic names applied to geologic units in a GeMS-compliant DescriptionOfMapUnits table (DMU). It allows for the semi-automated comparison of the usage, age, and extent (to the State level) of the unit names in the DMU with the information compiled in the U.S.Geologic Names Lexicon, or Geolex. Entries in the DMU were revised based on results from the tool. 2024 A second feature dataset, GeophysicalMap, was created and gravity and aeromagnetic data were added to this dataset. Gravity data includes maximum and minimum horizontal gradient files. Gradients were calculated using gravity data at a cell size of 400m. There is also an isometric ("contour") map of the gravity values, with units in mGal. Aeromagnetic data includes a maximum and minimum horizontal gradient files, with longitude, latitude, and gradient values in nT*km/km. Magnetic gradients were calculated from the reduced-to-pole (inclination and declination of 63 and 15 degrees, respectively) magnetic potential of aeromagnetic survey data (U.S. Geological Survey, 2002; Langenheim, 2022) that were adjusted to a common datum and gridded at a cell size of 200m and then filtered to enhance shallow sources. A computer algorithm was then used to locate the maximum horizontal gradient on the gravity and magnetic potential grids. There is also an isometric ("contour") map of the aeromagnetic values, with units in nT. Brooks et al., 2003 Brooks et al., 2008 Edelman, 1986 Gold et al., 2013 Gold et al., 2014 Grose et al., 2000a Grose et al., 2000b Grose et al., 2000c Grose et al., 2000d Grose et al., 2000e Hanson field notes Hanson and Schweickert, unpublished Harwood, unpublished Hietanen, 1981 Phillipson, 1995 Redwine Roberts (This Study) Saucedo and Wagner, 1992 Sheeks, 2016 Portola 100k basemap Sierra City 62.5k basemap Pierce and Koehler, 2023 Federal Geographic Data Committee, 2006 American Geosciences Institute Glossary of Geology ICS International Chronostratigraphic Chart USGS Geologic Names Lexicon 2024 Data were submitted for scientific, geologic names, and GIS review and data revised based on review comments. Final files were prepared for approval and release. 20250514 Point Point Universal Transverse Mercator 10 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North_American_Datum_1983 GRS 1980 6378137.0 298.257222101 Portola_GeMs.gdb FEATURE DATASET: GeologicMap ***All features classes in projected coordinates of NAD_1983_UTM_Zone_10N ***Note that feature classes have certain attribute fields such as OBJECTID, SHAPE, SHAPE_Length, SHAPE_Area that are assigned by the geographic information system. These fields are not editable and are not described below. FEATURE CLASS: ContactsAndFaults [Line Feature class] DESCRIPTION OF FIELDS: Type: Specifies type of geologic feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. IsConcealed:Indicates whether this contact or fault is concealed by an overlying map unit. Values = “N” or “Y”. Null values not permitted. LocationConfidenceMeters: Half-width (in meters) of positional-uncertainty envelope around this line feature. Data type = float. Null values not permitted; recommend setting value = −9 if value is not known. ExistenceConfidence: Indicates how confidently existence of this line feature has been determined. Typical values are “certain”, “questionable”, “unspecified”. Values must be defined in Glossary table. Null values not permitted. IdentityConfidence: Indicates how confidently this line feature has been identified as a particular type. Typical values are “certain”, “questionable”, “unspecified”. Values must be defined in Glossary table. Null values not permitted. Label: Describes text label for this line feature. Can be used to store fault name or other easily understood name for line feature. Allows for special fonts to show geologic age symbols. Null values are typical. Symbol: References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/). DataSourceID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted. ContactsAndFaults_ID: Primary key. Prefix "CAF". Values must be unique in database. Null values not permitted. FEATURE CLASS: MapUnitPolys [Polygon feature class] DESCRIPTION OF FIELDS: MapUnit: Short, easily understood ASCII-character identifier for the map unit represented by this polygon. Foreign key to DescriptionOfMapUnits table. Use of special characters is discouraged IdentityConfidence: Indicates how confidently this polygon has been identified as a particular map unit. Values must be defined in Glossary table. Null values not permitted. Label: Describes text label for this map-unit polygon. Symbol: References an area fill symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/. Numbers refer to Generic lookup-table numbers that represent specific CMYK color values, as listed on the CMYK color chart within the FGDC standard. DataSourceID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this polygon. Null values permitted. MapUnitPolys_ID: Primary key. Prefix "MUP". Values must be unique in database. Null values not permitted. FEATURE CLASS: GeologicLines [Line feature class] DESCRIPTION OF FIELDS: Type: Specifies kind of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. IsConcealed: Indicates whether this contact or fault is concealed by an overlying map unit. Values = “N” or “Y”. Null values not permitted. LocationConfidenceMeters: Half-width (in meters) of positional-uncertainty envelope around this line feature. Data type = float. Null values not permitted; recommend setting value = −9 if value is not known. ExistenceConfidence: Indicates how confidently existence of this line feature has been determined. Typical values are “certain”, “questionable”, “unspecified”. Values must be defined in Glossary table. Null values not permitted. Symbol: References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/). Label: Describes text label for this line feature. Can be used to store fold name or other easily understood name for line feature. Allows for special fonts to show geologic age symbols. Null values are typical. DataSourceID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted. GeologicLines_ID: Primary key. Prefix "GL". Values must be unique in database. Null values not permitted. FEATURE CLASS: OrientationPoints [Point Feature class] DESCRIPTION OF FIELDS: Type: Specifies kind of point feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. Azimuth: Strike of planar feature or trend of linear feature, as measured in degrees clockwise from geographic North. Data type = float. Values limited to range from 0 to 360; horizontal planar features may have any azimuth value. Inclination: Dip of planar feature or plunge of linear feature, as measured in degrees down from horizontal. Data type = float. Values limited to range from 0 to 90; types specified as horizontal (for example, “horizontal bedding”) should have value = 0. Types specified as vertical (for example, “vertical bedding”) should have value = 90. Null values not permitted. Symbol: References a point symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/). Label: Describes text label for this point feature. Can be used to store common name or other easily understood name for the feature. Allows for special fonts to show geologic age symbols. Null values are typical. LocationConfidenceMeters: Radius (in meters) of positional-uncertainty envelope around this point feature. Data type = float. Null values not permitted. IdentityConfidence: Indicates how confidently this point feature has been identified as a particular type. Null values not permitted; default value = “certain”. OrientationConfidenceDegrees: Estimated circular error (in degrees) of this orientation. Data type = float. Null values not permitted. Values are 1, for dip calculation using an elevation change from three or more contours, 2, for dip calculation using an elevation change from two contours only. PlotAtScale: Denominator of smallest map scale at which this point feature should be plotted on map (that is, it should not be plotted at smaller map scales). Data type = float. Null values not permitted; default value = 0 ( = display at all scales). StationID: Foreign key to Stations point feature class. Null values permitted. MapUnit: Records map unit to which this observation pertains. Foreign key to DescriptionOfMapUnits table. Values obtained by intersection with feature class MapUnitPolys. LocationSourceID: Identifies source of location of this point feature. Foreign key to DataSources table. Null values not permitted. OrientationSourceID: Identifies source of orientation data for this point feature. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this point feature. Null values permitted. OrientationPoints_ID: Primary key. Prefix"ORP". Values must be unique in database. Null values not permitted. FEATURE DATASET: GeophysicalMap ***All features classes in projected coordinates of NAD_1983_UTM_Zone_10N ***Note that feature classes have certain attribute fields such as OBJECTID, SHAPE, SHAPE_Length, SHAPE_Area that are assigned by the geographic information system. These fields are not editable and are not described below. FEATURE CLASS: GravityMinSpots [Point Feature class] DESCRIPTION OF FIELDS: Type: Specifies kind of point feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. Value: Specifies measured value that pertains to this point feature, in the original map units (mGal). Date type = float. Null values not permitted. Symbol: There is no required symbol for this feature. User may choose an ESRI symbol. Label: Describes text label for this point feature. Can be used to store common name or other easily understood name for the feature. Null values are typical. LocationConfidenceMeters: Radius (in meters) of positional-uncertainty envelope around this point feature. Data type = float. Null values not permitted. PlotAtScale: Denominator of smallest map scale at which this point feature should be plotted on map (that is, it should not be plotted at smaller map scales). Data type = float. Null values not permitted; default value = 0 ( = display at all scales). StationsID: Foreign key to Stations point feature class. Null values permitted. Mapunit: Records map unit to which this observation pertains. Foreign key to. LocationSourceID: Identifies source of location of this point feature. Foreign key to DataSources table. Null values not permitted. DataSource_ID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this point feature. Null values permitted. GravityMinSpotsID: Primary key. Prefix"GMS". Values must be unique in database. Null values not permitted. FEATURE CLASS: GravityMaxSpots [Point Feature class] DESCRIPTION OF FIELDS: Type: Specifies kind of point feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. Value: Specifies measured value that pertains to this point feature, in the original map units (mGal). Date type = float. Null values not permitted. Symbol:There is no required symbol for this feature. User may choose an ESRI symbol. Label: Describes text label for this point feature. Can be used to store common name or other easily understood name for the feature. Null values are typical. LocationConfidenceMeters: Radius (in meters) of positional-uncertainty envelope around this point feature. Data type = float. Null values not permitted. PlotAtScale: Denominator of smallest map scale at which this point feature should be plotted on map (that is, it should not be plotted at smaller map scales). Data type = float. Null values not permitted; default value = 0 ( = display at all scales). StationsID: Foreign key to Stations point feature class. Null values permitted. Mapunit: Records map unit to which this observation pertains. Foreign key to. LocationSourceID: Identifies source of location of this point feature. Foreign key to DataSources table. Null values not permitted. DataSource_ID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this point feature. Null values permitted. GravityMaxSpotsID: Primary key. Prefix"GXS". Values must be unique in database. Null values not permitted. FEATURE CLASS: MagneticMinSpots [Point Feature class] DESCRIPTION OF FIELDS: Type: Specifies kind of point feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. Value: Specifies measured value that pertains to this point feature, in the original map units (nT). Date type = float. Null values not permitted. Symbol: There is no required symbol for this feature. User may choose an ESRI symbol. Label: Describes text label for this point feature. Can be used to store common name or other easily understood name for the feature. Null values are typical. LocationConfidenceMeters: Radius (in meters) of positional-uncertainty envelope around this point feature. Data type = float. Null values not permitted. PlotAtScale: Denominator of smallest map scale at which this point feature should be plotted on map (that is, it should not be plotted at smaller map scales). Data type = float. Null values not permitted; default value = 0 ( = display at all scales). StationsID: Foreign key to Stations point feature class. Null values permitted. Mapunit: Records map unit to which this observation pertains. Foreign key to LocationSourceID: Identifies source of location of this point feature. Foreign key to DataSources table. Null values not permitted. DataSource_ID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this point feature. Null values permitted. MagneticMinSpotsID: Primary key. Prefix"MMS". Values must be unique in database. Null values not permitted. FEATURE CLASS: MagneticMaxSpots [Point Feature class] DESCRIPTION OF FIELDS: Type: Specifies kind of point feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. Value: Specifies measured value that pertains to this point feature, in the original map units (nT). Date type = float. Null values not permitted. Symbol: There is no required symbol for this feature. User may choose an ESRI symbol. Label: Describes text label for this point feature. Can be used to store common name or other easily understood name for the feature. Null values are typical LocationConfidenceMeters: Radius (in meters) of positional-uncertainty envelope around this point feature. Data type = float. Null values not permitted. PlotAtScale: Denominator of smallest map scale at which this point feature should be plotted on map (that is, it should not be plotted at smaller map scales). Data type = float. Null values not permitted; default value = 0 ( = display at all scales). StationsID: Foreign key to Stations point feature class. Null values permitted. Mapunit: Records map unit to which this observation pertains. Foreign key to LocationSourceID: Identifies source of location of this point feature. Foreign key to DataSources table. Null values not permitted. DataSource_ID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this point feature. Null values permitted. MagneticMaxSpotsID: Primary key. Prefix"MXS". Values must be unique in database. Null values not permitted. FEATURE CLASS: GravityContours [Line Feature class02.] DESCRIPTION OF FIELDS: Type: Specifies type of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. Value: Specifies measured value that pertains to this line feature, in the original map units (mGal). Date type = float. Null values not permitted. ValueConfidence: Value uncertainty in mGal. Data type = float. Null values not permitted; recommend setting value = –9 if value is not known. Symbol: References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/). Label: Describes text label for this line feature. Can be used to store common name or other easily understood name for the feature. Null values are typical. DataSourceID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this point feature. Null values permitted. GravityContoursID: Primary key. Prefix "GVC". Values must be unique in database. Null values not permitted. FEATURE CLASS: MagneticContours [Line Feature class] DESCRIPTION OF FIELDS: Type: Specifies type of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted. Value: Specifies measured value that pertains to this line feature, in the original map units. Date type = float. Null values not permitted. ValueConfidence: Value uncertainty in nT. Data type = float. Null values not permitted; recommend setting value = –9 if value is not known. Symbol: References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/). Label: Describes text label for this line feature. Can be used to store common name or other easily understood name for the feature. Null values are typical. DataSourceID: Identifies source of each data element. Foreign key to DataSources table. Null values not permitted. Notes: Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this point feature. Null values permitted. MagneticContoursID: Primary key. Prefix "MGC". Values must be unique in database. Null values not permitted. NON-SPATIAL TABLE: DataSources DESCRIPTION OF FIELDS: Source: Short description of source FullCitation: complete citation of publication URL: URL link to data (at time of publication), if available Notes: Free text for additional information specific to this entry. DataSource_ID: Primary key. Unique to each data entry (DAS*) NON-SPATIAL TABLE: Glossary DESCRIPTION OF FIELDS: Term: Geologic concept, feature, phenomenon, or other terminology being defined Definition: Definition of value in Term DefinitionSource_ID Notes: Free text for additional information specific to this entry. Glossary_ID: Primary key. Unique to each glossary entry (GLO*) NON-SPATIAL TABLE: DescriptionOfMapUnits DESCRIPTION OF FIELDS: MapUnit: Short unit name Name: Name of geologic unit. FullName: Full unit name that may include member/formation/group associations Age: Period or Epoch of unit consistent with USGS time scale Description: Text description of map unit HierarchyKey: String of dash-delimited numeric values that illustrate the hierarchical relationship between units ParagraphStyle: Name of user-defined paragraph style that indicates hierarchy of map units and headings within DMU Label: Describes text label for map-unit polygons. Field from which map-unit label is generated Symbol: If used, references an area-fill symbol specified in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/) AreaFillRGB: Specifies RGB (red-green-blue colorspace values) equivalent of area-fill color of map unit as{<red value>,<green value>,<blue value>} DescriptionSourceID: Identifies source of Description. Foreign key to DataSources table GeoMaterial: Term categorizing the dominant lithology in the map feature. Term derived from NGMDB standard term list (see APPENDIX A. TERMS FOR GEOMATERIAL AND GEOMATERIALCONFIDENCE in GeMS data model https://ngmdb.usgs.gov/Info/standards/GeMS/) GeoMaterialConfidence: Qualitative term describing appropriateness of the GeoMaterial term used DescriptionOfMapUnits_ID: Primary key. Unique to each data entry (DMU*) NON-SPATIAL TABLE: GeoMaterialDict This nonspatial table is a standard part of any GeMS spatial database and is not modified by the authors. This table is described within the GeMS documentation; also see the web page https://ngmdb.usgs.gov/Info/standards/GeMS/ EntityAndAttribute_DataDictionary_Portola_GeMS.xlsx EntityAndAttribute_DataDictionary_Portola_GeMS.csv U.S. Geological Survey GS ScienceBase mailing address

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Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/xxxxxxxx None. This dataset is provided by USGS as a public service. 20240815 Michelle A Roberts USGS - SOUTHWEST REGION Geologist mailing and physical

NASA AMES-Moffett Field,Moffett Field - Building 19

Moffett Field CA 94035 650-329-4908 roberts@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998