Geology of the National Capital Region—
Field Trip Guidebook
Great Falls of the Potomac River, looking north on the Virginia side. The Potomac falls 80 feet across resistant metagraywacke and schist of Neoproterozoic to Early Cambrian age. Downcutting of the Potomac from the bedrock terrace to the current river channel occurred in the last 30,000 years. See field trips 5 and 6.
Photograph by Gary Fleming, Virginia Department of Conservation and Recreation.
Department of the Interior
U.S. Geological Survey
U.S. Department of the Interior, U.S. Geological Survey
URL: https:// pubs.usgs.gov /circ/2004/1264/index.html
For more information, contact Scott Southworth or William Burton
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