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| Carboniferous - Elkgarden formation; Fairfax formation; Bayard formation; Savage formation; Blackwater formation; Canaan formation; Greenbrier limestone; Pocono sandstone (1) |
| Devonian - Hampshire formation; Jennings formation; Romney shale; Monterey sandstone (1) |
| Geology -- United States --Maps (1) |
| Geology--Maryland--Maps (1) |
| Geology--West Virginia--Maps (1) |
| Silurian - Monterey sandstone; Lewistown chert-lentil; Lewistown limestone; Rockwood formation; Cacapon sandstone; Tuscarora quartzite; Juniata formation (1) |