20240307 09523000 1.0 FALSE DataSources 002 20240307 16242200 20240307 16242200 Anne Carter Witt Virginia Department of Energy, Geology and Mineral Resources Program Geologist 434-951-6319 900 Natural Resources Drive, Suite 500 Charlottesville VA 22903 anne.witt@energy.virginia.gov 20211127 ArcGIS Metadata 1.0 Enterprise Geodatabase Table Non-spatial table DataSources, part of Statewide Geologic Map Database of Virginia: Virginia Department of Energy, Geology and Mineral Resources Program, Open-file Report 2021-12, scale 1:250,000. 2021-11-30 1.0 Witt, A.C., Heller, M.J., Occhi, M.E., Spears, D.B., Lang, K.E., Berquist, C.R. Jr., and Prince, P.S., editors Virginia Department of Energy Virginia vector digital data This digital map database represents the general distribution of surficial and bedrock geologic units mapped in the Commonwealth of Virginia and compiled at a nominal scale of 1:250,000. New and modified geologic contacts were digitized on screen by geologists at approximately 1:24,000 from maps that ranged from 1:24,000 to 1:250,000-scale. The database delineates map units that are identified by general age and lithology, generally following the stratigraphic nomenclature of the U.S. Geological Survey (USGS). This metadata report provides an overview of the data content of this GeMS geodatabase and associated files. This digital map database represents an update to the contact lines, geologic map units, and map unit descriptions found on the 1993 Geologic Map of Virginia and is intended to show the generalized geology of the state. The database also provides surficial geologic units derived from 10-meter LIDAR and new geologic mapping (where available) as a separate feature class. It is recommended that users not use the data beyond the recommended scale range of 1:100,000. Users requiring more detailed geologic mapping should refer to the original geologic map citation found the "DataSources" field of the various feature classes and non-spatial tables. This digital database was prepared and edited by Witt, A.C., Heller, M.J., Occhi, M.E., Spears, D.B., Lang, K.E., Berquist, C.R. Jr. and Prince, P.S. Anne Carter Witt Virginia Department of Energy, Geology and Mineral Resources Program Geologist 434-951-6319 900 Natural Resources Drive, Suite 500 Charlottesville VA 22903 anne.witt@energy.virginia.gov Blue Ridge Appalachian Plateau Valley and Ridge Piedmont Virginia Coastal Plain geoscientificInformation ISO 19115 Topic Category geologic geologic contacts geologic mapping surficial geologic units geologic maps geomorphology surficial geologic maps geological map geologic faulting geologic formations geoscientificInformation geologic geologic contacts geologic mapping surficial geologic units geologic maps geomorphology surficial geologic maps geological map geologic faulting geologic formations Blue Ridge Appalachian Plateau Valley and Ridge Piedmont Virginia Coastal Plain This dataset is not precise beyond 1:100,000-scale and is not for use at scales larger than 1:100,000. Any derivative products utilizing these datasets shall clearly indicate their source. If users modify the data in any way they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these datasets, nor to imply that changes they made were approved by the Virginia Department of Energy. The Virginia Department of Energy (Virginia Energy) provides these geographic data "as is." Virginia Energy makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. Virginia Energy further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at Virginia Energy, no warranty, expressed or implied, is made by Virginia Energy regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall Virginia Energy have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of delivery, installation, operation, or support by Virginia Energy. Esri ArcGIS 10.5 (Build 6491) Service Pack N/A (Build N/A) true -83.6754 -75.1664 39.466 36.5409 publication date 1993-01-01 2021-11-30 Non-spatial table DataSources is part of VAStateGeologicMap.gdb, a composite dataset 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/. The accuracy of the geologic data varies depending on the compiled map. In general, contact lines were digitized on screen at 1:24,000-scale. The accuracy of the line work (and generated map unit polygons) is reflected in the LocationConfidenceMeters field in the ContactsAndFaults feature class. Surficial units were interpreted primarily using 10-meter LIDAR or from geologic maps, if available. All line work (bedrock and surficial) was given a corresponding data source citation, identifying the original map source for the line work or the geologist who made the contact line interpretation. Database topology, geometric, and logical errors were identified and fixed iteratively using the "Check Topology" tool and the "Validate Database" tool in the ArcGIS GeMS Database Toolbox (available at https://github.com/usgs/gems-tools-arcmap). The geologic bedrock data and geologic descriptions include information from published geologic maps up to 2021 and is considered to be an update to the geologic map line work originally compiled in 1993. Surficial data was digitized from 10-meter LIDAR flown between 2010 and 2019. Only surficial features that were large enough to identify at 1:24,000-scale were added to MapUnitOverlayPolys. A personal geodatabase of the 1993 map (including contacts and map unit polygons) was imported to a GeMS format geodatabase. Original geologic map descriptions from the 1993 Expanded Explanation were copied from a Word document into the DescriptionOfMapUnits table. Citations were added from the Expanded Explanation into the DataSources table. This data was then loaded onto an ArcSDE server so that multiple editors could update and edit geologic contacts. 2019-01-01 Geologic contact lines were used to build geologic map unit polygons using the ArcGIS Feature to Polygon tool. A temporary annotation feature class was used to label the map unit polygons and symbolize (color) them. 2021-01-01 Geologic contacts where compiled and updated by geologists from various map sources. Geologists digitized contacts at a nominal scale of 1:24,000. Edge match issues were resolved by the individual geologist. Citations for the source for individual contact lines were added to the DataSources table. Surficial units were also digitized and added to the MapUnitOverlayPolys feature class. 2021-01-01 The GeMS ArcToolbox was used to validate the database, update metadata, and automate field completion. 2021-01-01 Map unit descriptions were updated for each geologic unit using the best available geologic data in an Excel spreadsheet. Citations are provided in the DataSources table and fields. Colors were chosen for each map unit. These colors were then used to symbolize the map units built in Step 3. 2021-01-01 7825 withheld 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 Table 979 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. created_user An ArcGIS-generated editor tracking field. GeMS ESRI created_date An ArcGIS-generated editor tracking field. GeMS ESRI last_edited_user An ArcGIS-generated editor tracking field. GeMS ESRI last_edited_date An ArcGIS-generated editor tracking field. GeMS ESRI dataset