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Archean - unnamed strata (1) |
Cambrian - Gallatin formation; Flathead formation (1) |
Carboniferous - Quadrant formation; Madison limestone (1) |
Cretaceous - Laramie formation; Montana formation; Colorado formation; Dakota formation; Livingston formation (1) |
Devonian - Three Forks shale; Jefferson limestone (1) |
Geology -- Montana -- Maps (1) |
Geology -- Montana -- Three Forks (1) |
Geology -- United States --Maps (1) |
Jurassic - Ellis formation (1) |
Neogene - Bozeman lake-beds (1) |