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| Archean - Carolina gneiss (1) |
| Cretaceous - Monmouth formation; Matawan formation; Potomac formation (1) |
| Geology -- United States --Maps (1) |
| Geology--Maryland--Maps (1) |
| Geology--Virginia--Maps (1) |
| Geology--Washington (D.C.)--Maps (1) |
| Neogene - Lafayette formation; Chesapeake formation (1) |
| Paleogene - Pamunkey formation (1) |