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USGS Geology in the Parks

Geologic Provinces of the United States: Appalachian Highlands Gallery

Old Rag Mountain

Looking East from Blue Ridge

Shenandoah National Park
Photo by Paul Hackley, USGS

Looking east from Blue Ridge, the western boundary of the Blue Ridge and Great Valley of the Valley and Ridge provinces, to Old Rag Mountain in Shenandoah National Park, Virginia. The craggy peaks of light rock are billion year old leucocratic Old Rag Granite. Beyond the peak is the dissected plateau of the Piedmont province that is underlain by less resistant polymetamorphic rocks.

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