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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) |