Digital Geologic Map of the Harpers Ferry National Historical Park

Digital Geologic Map of Loudoun County

Geologic Map of the Potomac River Gorge: Great Falls Park, Virginia, and part of the C&O Canal National Historical Park, Maryland

Geologic Map Database of the Washington DC Area Featuring Data from Three 30 x 60 Minute Quadrangles: Frederick, Washington West, and Fredericksburg

Maintained by: EESP Team Staff
Contact: Peter Chirico (pchirico@usgs.gov)