Entry_ID: (required) Entry_Title: Geologic Map Database of the Washington DC Area Featuring Data From Three 30 X 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg Group: Data_Set_Citation Originator(s): Adam M. Davis; C. Scott Southworth; J. Stephen Schindler; James E. Reddy Title: Geologic Map Database of the Washington DC Area Featuring Data From Three 30 X 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg Publication: U.S. Geological Survey Open-File Report Publication_Date: 2001 Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Edition: 1.0 Data_Presentation_Form: Tabular digital data and map URL: http://pubs.usgs.gov/openfile/of01-227/ End_Group Keyword: Geology Keyword: Geologic Keyword: Bedrock Keyword: Surficial Keyword: Fault Keyword: Structure Keyword: Map Group: Temporal_Coverage Start_date: 1988 Stop_date: 2001 End_Group Data_Set_Progress: Complete Group: Spatial_Coverage Southernmost_Latitude: 38.00 Northernmost_Latitude: 39.50 Westernmost_Longitude: -78.00 Easternmost_Longitude: -77.00 End_Group Location: Frederick Location: Maryland Location: Washington Location: DC Location: Fredericksburg Location: Virginia Location: West Virginia Group: Data_Resolution Latitude_Resolution: 0.001 Longitude_Resolution: 0.001 End_Group Access_Constraints: None Use_Constraints: Although all data released in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Originating_Center: (required) Group: Data_Center Data_Center_Name: U.S. Geological Survey Dataset_ID: USGS Open-File Report 01-227 Group: Data_Center_Contact Last_name: U.S. Geological Survey First_name: N/A Email: ssouthwo@usgs.gov Phone: 703-648-6385 Group: Address National Center, MS926A Reston, Virginia 20192 USA End_Group End_Group End_Group Group: Distribution Distribution_Media: online Distribution_Format : Arc/Info export-interchange Distribution_Size: 37.0 megabytes Fees: None End_Group Group: Multimedia_Sample URL: Format: GIF Group: Description Reduced-size image showing the general layout of map sheet. 640x864 pixels, 24-bit color. End_Group End_Group Group: Multimedia_Sample URL: Format: GIF Group: Description Reduced-size image showing the general layout of map sheet. 640x864 pixels, 24-bit color. End_Group End_Group Group: Reference End_Group Group: Summary Geology was researched and compiled for use in studies of ecosystem health, environmental impact, soils, groundwater, land use, tectonics, crustal genesis, sedimentary provenance, and any others that could benefit from geographically referenced geological data. The Washington DC Area geologic map database (DCDB) provides geologic map information of areas to the NW, W, and SW of Washington, DC to various professionals and private citizens who have uses for geologic data. Digital, geographically referenced, geologic data is more versatile than traditional hard copy maps, and facilitates the examination of relationships between numerous aspects of the geology and other types of data such as: land-use data, vegetation characteristics, surface water flow and chemistry, and various types of remotely sensed images. The DCDB was created by combining Arc/Info coverages, designing a Microsoft (MS) Access database, and populating this database. Proposed improvements to the DCDB include the addition of more geochemical, structural, and hydrologic data. Data are provided in several common GIS formats and MS Access database files. The geologic data themes included are bedrock, surficial, faults and fold axes, neat line, structural data, and sinkholes; the base themes are political boundaries, roads, elevation contours, and hydrography. Data were originally collected in UTM coordinates, zone 18, NAD 1927, and projected to geographic coordinates (Lat/Long), NAD 1983. The data base is accompanied by large format color maps, a readme.txt file, and a explanatory PDF pamphlet. End_Group Group: DIF_Author Last_name: U.S. Geological Survey First_name: N/A Email: jreddy@usgs.gov Phone: 607-266-0217, x3014 Group: Address 30 Brown Road Ithaca, New York 14850 USA End_Group End_Group DIF_Revision_Date: 20020505 Science_Review_Date: