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Cambrian - Shenandoah limestone; Antietam sandstone; Harpers shale; Weverton sandstone; Loudoun formation (1) |
Geology -- United States --Maps (1) |
Geology--Maryland--Maps (1) |
Geology--Virginia--Maps (1) |
Geology--West Virginia--Maps (1) |
Jurassic - Newark formation; Diabase (1) |
Neogene - Lafayette formation (1) |
Proterozoic - Catoctin schist; Catoctin schist and granite (1) |
Silurian - Martinsburg shale; Shenandoah limestone (1) |
Triassic - Newark formation; Diabase (1) |