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USGS Geology in the Parks

Geologic Provinces of the United States: Appalachian Highlands Gallery

Old Rag Mountain

Blue Ridge

Shenandoah National Park
Photo by Paul Hackley, USGS

View looking west to Blue Ridge from the crest of Old Rag Mountain, Shenandoah National Park, Virginia. Outcrop and weathered boulders of billion year old light "leucocratic", quartz-rich Old Rag Granite is in the foreground. Blue Ridge to the west is underlain by Late Proterozoic Catoctin Formation which is comprised of massive 575 million year old basalt metamorphosed to greenstone in the Middle Paleozoic. Blue Ridge forms the provincial boundary with the Great Valley of the Valley and Ridge province.

Appalachian Highlands
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