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Archean - unnamed strata (1) |
Cambrian - Gallatin limestone; Flathead formation (1) |
Carboniferous - Quadrant formation; Madison limestone (1) |
Cretaceous - Laramie formation; Montana formation; Colorado formation; Dakota formation (1) |
Devonian - Threeforks limestone (1) |
Geology -- United States --Maps (1) |
Geology--Yellowstone National Park--Maps (1) |
Jurassic - Ellis formation: Tenton formation (1) |
Neogene - Electric intrusives; Trachytic rhyolite; Hot Spring formations; Lacustrine formation; Canyon conglomerate; Pinyon conglomerate; Sylvan intrusives (1) |
Paleogene - unnamed strata (1) |