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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) |