• Lead agency -- Delaware Geological Survey
• Cooperating State agencies -- Maryland Geological Survey, New Jersey Geological and Water Survey, Virginia Division of Geology and Mineral Resources
• Status -- Completed
• Please address inquiries to Peter McLaughlin (Delaware Geological Survey) or NGMDB staff.

The Delaware Geological Survey (DGS) has completed the first phase of a multi-state, multi- organization initiative aimed at establishing a regional understanding of the equivalencies of formation names across state lines in the Middle Atlantic Coastal Plain province (New Jersey- Delaware-Maryland-Virginia). This project, the Middle Atlantic Coastal Plain Stratigraphic Reconciliation Initiative or "MAtStrat", was developed as a cooperative effort of regional experts from state geological survey organizations, water resource agencies, universities, and the USGS. The DGS established an informal Middle Atlantic Coastal Plain Stratigraphy Working Group and coordinated workshops to identify important questions of stratigraphic equivalency between the states and to develop plans to resolve those questions. The results of the project are expected to benefit surficial geological mapping efforts in the region as well as the management of groundwater resources. It is hoped that the results support geological mapping efforts in the region by serving as a resource for the resolution of longstanding issues of formation name equivalencies at state boundaries where surficial geological maps created by different agencies can appear to conflict. The results also provide improved clarity of the equivalency of geologic names for groundwater-bearing formations between the states, allowing a better understanding of the connectivity of aquifer systems beneath these states. The project objectives, methodologies, and summary of results are outlined in a final project report. Draft correlation charts and regional cross sections will be released in final format after review with the participating state geological surveys. An extensive collaborative data store is accessible to participating organizations and researchers and will be migrated in 2024 to a more permanent cloud storage space.

• Lead agency -- Oregon Department of Geology and Mineral Industries
• Status -- Completed
• Please address inquiries to Mike Darin (DOGAMI) or NGMDB staff.

The published Oregon Geologic Data Compilation (OGDC, see publication) is not a traditional compilation map with consistent linework and geologic units across the state. Instead, it is a variable-scale collage of the best-available geologic mapping within the state, with their original linework and units retained. The previous version, OGDC-7, mosaiced 342 source maps with 7,240 source-map units. Source-map units were classified into a Terrane/Group–Formation–Member–Unit hierarchy and assigned values of rock type, age, and lithology that resulted in more than 2,000 unique compilation units.

Through this DOGAMI-USGS co-op project, we produced a new version 8 of OGDC (OGDC-8) and developed a consistent and working stratigraphic framework for Oregon. By assigning formal or informal Formation-level names to source-map units that were classified only at the Terrane/Group level in OGDC-7, this new OGDC-8 compilation reduces the Terrane/Group–Formation–Member–Unit hierarchy to a total of only 494 unique Formation-level map units that each correspond with one of 56 unique Terrane/Groups statewide. This effort allowed us to generate the first comprehensive stratigraphic correlation, or time-rock, charts for the state of Oregon. These new charts include five regional charts at the Formation level for NW Oregon, SW Oregon, the Cascade Range, NE Oregon, and SE Oregon, and a single chart at the Terrane/Group level for the entire state.

• The final technical report, including six regional correlation charts, will be published in 2024 as a DOGAMI Digital Data Series Release.

• Lead agency -- Geological Survey of Alabama
• Cooperating State agencies -- Florida Geological Survey, Mississippi Office of Geology
• Status -- In Progress; begun in 2021
• Please address inquiries to Sandy Ebersole (Geological Survey of Alabama) or NGMDB staff.

The Geological Survey of Alabama is coordinating an East Gulf Coastal Plain Stratigraphic Working Group that will allow participating entities to cooperatively develop a consistent regional stratigraphic nomenclatural framework and advance USGS and State Geological Survey goals such as applicability to petroleum and groundwater issues. The Working Group will create and publish updated regional stratigraphic charts and cross sections.

Deliverables (currently being compiled) include the following: A summary report detailing nomenclatural issues, revisions to stratigraphy, and GeoLex updates required; a three-state Cenozoic stratigraphic chart; a three-state Mesozoic stratigraphic chart; geophysical well log cross sections; hydro-unit information; and a document on recommendations for future multi- state stratigraphic research.

Two open-file annual reports are available below, summarizing progress during the first two years of the project. The project has been extended to allow more time to study certain complex stratigraphic issues and to ensure completion of the final deliverables addressing those issues. During the course of this project, two workshops were held and attended by representatives from Alabama, Mississippi, and Florida, which helped further the stratigraphic discussions as we worked toward stratigraphic revisions and deliverables. Geologists on the three-state team also visited the field and examined well logs and core as part of the stratigraphic investigations.

• Progress report, 2022
• Progress report, 2023

• Lead agency -- Delaware Geological Survey
• Cooperating State agencies -- Maryland Geological Survey, New Jersey Geological and Water Survey, Virginia Division of Geology and Mineral Resources
• Status -- Completed
• Please address inquiries to Peter McLaughlin (Delaware Geological Survey) or NGMDB staff.

As a result of the initial finding of the MAtStrat I Cooperative, the Delaware Geological Survey conducted a MAtStrat II project to address unresolved issues in the stratigraphically complex late Miocene to early Pleistocene sediments in Middle Atlantic Coastal Plain from southeastern Virginia to Cape May, New Jersey. These strata contain important aquifers that are used by public water systems, agriculture, industry, and household consumers in the region, including growing municipalities with large summer tourist populations located along the Atlantic Coast. The project goal was to examine in detail all available core and sample material in the area to develop a regional stratigraphic framework of the units. This was accomplished by 1) collection of all available stratigraphic data both published and unpublished, 2) identification of available core material, 3) construction of regional cross sections, 4) a multi-state workshop to refine the cross sections and correlations, and 5) identification of additional work needed. Drilling was undertaken to address data gaps in critical areas. A 470-foot continuous wireline corehole was drilled in the middle of the region near Berlin, Maryland. Split-spoon coreholes were drilled further north nearer the Maryland-Delaware border and further south at the Maryland-Virginia border. Combined with the compilation of older data, the new cores clarify the nature of the north-to-south stratigraphic changes in the late Miocene to early Pleistocene sediments of the Delmarva Peninsula. In addition, the project served as an excellent opportunity to train university students in methods to describe sediment in detail, and to familiarize them with drilling techniques. The project objectives, methodologies, and summary of results are outlined in a final project report. Draft correlation charts and regional cross sections will be released in final format after review with the participating state geological surveys. The data assembled for this project is included in the same extensive collaborative data store as the MAtStrat I Project; it is accessible to participating organizations and researchers and will be migrated in 2024 to a more permanent cloud storage space.

• Lead agency -- Kansas Geological Survey
• Cooperating State agencies -- Iowa Geological Survey, Missouri Geological Survey, Nebraska Conservation and Survey Division, Oklahoma Geological Survey
• Status -- Completed, 2023
• Please address inquiries to Tony Layzell (Kansas Geological Survey) or NGMDB staff.

The midcontinent region of the United States (Kansas, Oklahoma, Missouri, Nebraska, and Iowa) has been a natural laboratory for the development of stratigraphic methods over the last 120+ years. This rich, long history has produced a voluminous literature that has been of great benefit to regional mining, aggregate, and petroleum industries. Unfortunately, however, the use, definition, and stratigraphic position of many Pennsylvanian rock units has varied between States and frequently changed through time, resulting in complexity and confusion in terms of stratigraphic nomenclature, correlation, and geologic mapping. The goal of this project was to develop a unified, regional understanding of Pennsylvanian stratigraphy across State boundaries. In order to achieve this goal, a regional working group, organized by the Kansas Geological Survey, was established. The group is composed of experts from geological surveys and academic institutions in Kansas, Missouri, Nebraska, Oklahoma, and Iowa.

• Nomenclatural history of Pennsylvanian strata in Kansas (KGS Open-file Report 2022-5 or NGMDB page)
• Lithostratigraphic Correlations of the Upper Desmoinesian and Missourian Stages (Pennsylvanian) in Eastern Kansas (KGS Open-file Report 2022-3)
• Oborny, S., Layzell, A., Ludvigson, G., & Hasiuk, F., 2022, Revision to Nomenclature of the Zarah Subgroup of the Kansas City Group (Pennsylvanian) in Kansas: Midcontinent Geoscience, 3, p. 27-34, https://doi.org/10.17161/mg.v3i.18249.
• Oborny, S., Hasiuk, F., Layzell, A.L., Smith, J.J., in review, Outcrop-to-subsurface stratigraphic correlations of the Upper Desmoinesian and Lower Missourian stages (Pennsylvanian) in eastern Kansas: regional assessment of group boundaries from type, principal, and neostratotype sections: Kansas Geological Survey Bulletin.

• Lead agency -- Kentucky Geological Survey
• Status -- Completed
• Please address inquiries to Doug Curl (Kentucky Geological Survey) or NGMDB staff.

The Kentucky Geological Survey is identifying and categorizing stratigraphic discontinuities across map boundaries, and recommending if and how these discontinuities should be dealt with. A documentation protocol for geologic map discontinuities in digital geologic map compilations will be developed, using Kentucky's statewide 1:24,000 digital geologic map as the foundation of the effort.

• Lead agency -- Maine Geological Survey
• Cooperating State agencies -- Connecticut Geological Survey, Massachusetts Geological Survey, New Hampshire Geological Survey, Vermont Geological Survey
• Status -- Completed. Proposal approved 2021, work began 2023, final products posted December 2023.
• Please address inquiries to Maine Geological Survey or NGMDB staff.

While the basic concept of New England as a Paleozoic plate tectonic collision zone was established in the 1970’s, recent advances in high-precision geochronology have allowed workers to recognize an increasingly complex array of continental fragments, microcontinents, island arcs, sedimentary basins, and other stratigraphic elements that are incorporated in an intricately deformed, repeatedly metamorphosed, and highly intruded orogenic system.

The existing bedrock maps for the six New England states were compiled at different scales at different times ranging from 1983 to 2011. Each map not only represents the state of knowledge at the time it was made, but also is a reflection of the tectonic model and stratigraphic perspective selected by its compilers. For these reasons there are inconsistencies of many types across state boundaries. In addition, more recent mapping has shown places in every state where the state maps need to be updated.

In this initial collaborative project of the New England States Geologic Mapping Coalition (NESGMC) we reviewed the existing state of knowledge, identified areas where we could see that regional and local stratigraphic problems exist, especially ones that affect cross-border areas, and offered recommendations for addressing them. The goal was not to solve stratigraphic problems, but to guide next steps such as designing research proposals, directing state or federally-funded mapping programs, or initiating academic research projects on stratigraphy-related topics, big and small. The resulting report and accompanying robust citations file in csv format are freely available at the Digital Maine Repository at https://digitalmaine.com/geo_docs/194/. Other project documents, including the proposal and workplan, are posted on the NESGMC website.

• See final report and preliminary documents at the NESGMC website

• Lead agency -- Pennsylvania Geological Survey
• Status -- Completed March, 2023
• Please address inquiries to Gale Blackmer (Pennsylvania Geological Survey) or NGMDB staff.

The Pennsylvania Geological Survey has completed the initial compilation of the Pennsylvania Universal Bedrock Geologic Units Table through an in-depth literature review of current formal and informal bedrock geologic units that appear on agency maps and reports. The review revealed previous inconsistencies that had yet to be resolved and new inconsistencies that had not yet been discovered. Following an internal review of these discrepancies, feedback from the geologic community was sought. Through this continuous open discussion with professionals throughout the community, fostered by the survey’s stratigraphic forum series, the inconsistencies in nomenclature and correlation across Pennsylvania were addressed. This project provided the opportunity to identify areas, both geographically and stratigraphically, in which knowledge is generally lacking. While quick resolutions were sometimes possible, many questions were more complex and will ultimately require additional research or field work. The ability to pinpoint the areas in which understanding is lacking will help to guide future research at the survey. The continuation of the modernization of Pennsylvania’s stratigraphic framework include pinpointing the area of the State, or the general location, in which each unit can be found (geographic extent) and continuing to work through the stratigraphic column into younger units, including unconsolidated deposits.

The results of this project will provide the foundation on which to build a series of updated stratigraphic columns for regions of the state. The results also provide a framework for the Pennsylvania Geological Survey plans to build an inventory of outcrop and subsurface core sections that will allow geologists to examine representative examples of the formations in different regions. The nomenclature changes recommended as a result of this investigation will be formalized through publication of geological reports or documentation through USGS's Professional Paper series "Stratigraphic Notes". All nomenclature updates will be delivered to NGMDB for inclusion in Geolex. The information that comprises the new stratigraphic framework will be released to the public through Pennsylvania Geologic Data Exploration (PaGEODE) website.

• Final report (2022)
• Spreadsheets for all formal units

• Lead agency -- Geological Survey of Alabama
• Cooperating State agencies -- Arkansas Geological Survey, Louisiana Geological Survey, Mississippi Office of Geology, Tennessee Geological Survey, Texas Bureau of Economic Geology
• Status -- In Progress; begun in 2022
• Please address inquiries to Greg Guthrie (Geological Survey of Alabama) or NGMDB staff.

The Geological Survey of Alabama is leading the extension of its East Gulf Coastal Plain initiative, to focus on stratigraphic units in the West Gulf Coastal Plain, including deposits in the Mississippi Embayment. Significant outcrop and subcrop differences in Mesozoic and Cenozoic strata are present throughout the stratigraphic section in these regions that comprise the northeastern, central, and western part of the northern Gulf of Mexico basin and these are reflected in the different nomenclature used by each state.

An initial workshop was convened in Baton Rouge, LA, by members of the working group that included representatives from each of the state participants. Working group discussions focused on the overall project goals, the status of the East Gulf Coast Stratigraphic Initiative and Working Group investigations and methodology, ongoing stratigraphic investigations in each state, ideas on specific stratigraphic intervals in contention, and state participant's needs in order to accomplish the goals. It was agreed that a second workshop would be convened during Fall of 2023 to discuss progress, identify additional units of contention and agreement, and to discuss any problems or issues that have arisen during the project. An additional workshop may be held in southern Arkansas in the Spring of 2024 to follow up on the Fall meeting items and to visit type section outcrops in the area.

• Lead agency -- South Carolina Geological Survey
• Cooperating State agencies -- Florida Geological Survey, North Carolina Geological Survey, Virginia Division of Geology and Mineral Resources
• Status -- In Progress; begun in late 2023
• Please address inquiries to Will Doar and Katie Luciano (South Carolina Geological Survey) or NGMDB staff.

The South Carolina Geological Survey is leading a Southeastern Atlantic Coastal Plain working group, to include the geological surveys of Virginia, North Carolina, South Carolina, and Florida. Representation from Georgia will come from interested universities. The purpose is to address stratigraphic issues, in part to facilitate the orderly development of interstate stratigraphic correlations.

• Lead agency -- Illinois State Geological Survey
• Cooperating State agencies -- Kentucky Geological Survey, Missouri Geological Survey
• Status -- In Progress; begun in late 2023
• Please address inquiries to Joe Devera and Scott Elrick (Illinois State Geological Survey) or NGMDB staff.

The Illinois State Geological Survey will develop a unified geological nomenclature of the Midcontinent stratigraphy of the Coastal Plains province of Illinois, Kentucky and Missouri. Outcrop and subcrop differences in nomenclature from Mesozoic and Cenozoic strata are present throughout the stratigraphic sections of the upper Mississippi Embayment region of southern Illinois, southeastern Missouri, and western Kentucky. The project will convene a Midcontinent Coastal Plains Province working group, managed by the Illinois State Geological Survey and comprised of stratigraphic experts from the three states, to address interstate stratigraphic frameworks, terminology discrepancies, and resolve 'state-line faults'.

• Lead agency -- Delaware Geological Survey
• Cooperating State agencies -- Maryland Geological Survey, New Jersey Geological and Water Survey, Virginia Division of Geology and Mineral Resources
• Status -- In Progress; begun in late 2023
• Please address inquiries to Peter McLaughlin (Delaware Geological Survey) or NGMDB staff.

The Delaware Geological Survey will be documenting and sharing the data framework used for the two previous MAtStrat Cooperative Agreements. The project has two goals: 1) to document how MAtStrat data and information types were collected, organized, and stored, and 2) to transform the project data framework into a collaborative data-sharing hub for Middle Atlantic Coastal Plain stratigraphic equivalency researchers that provides access to data assembled during the MAtStrat project and standards for addition of future data.