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Database of the Geologic Map of North America
"The Geological Society of America’s (GSA) Geologic Map of North America (Reed and others, 2005; 1:5,000,000) shows the geology of a significantly large area of the Earth,... -
U.S. Geological Survey Coastal and Marine Geoscience Data System
USGS's compendium of geoscience data from the Coastal and Marine Geology Program (CMGP). Contains seismic, sidescan sonar, bathymetry, gravity, magnetic, and lidar data. Has a... -
Topography of Virginia
Topography maps and information about Virginia, includes links to other topography sites. -
Tennessee GIS: Elevation Data
From the site: "Digital elevation model (DEM) data are arrays of regularly spaced elevation values referenced horizontally either to a Universal Transverse Mercator (UTM)... -
Karst in the United States: A Digital Map Compilation and Database
From the site: "This report describes new digital maps delineating areas of the United States, including Puerto Rico and the U.S. Virgin Islands, having karst or the potential... -
West Virginia Topographic Maps: Part 2
From the site: “A Digital Raster Graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. An unclipped scanned image includes all marginal... -
West Virginia Topographic Maps: Part 1
From the site: “A Digital Raster Graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. An unclipped scanned image includes all marginal... -
National Geologic Map Database
A distributed archive of standardized geoscience spatial information and data for the nation. Developed by the USGS and State Geological Surveys.