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Archean - unnamed strata (3) |
Carboniferous - Quadrant formation; Madison limestone (3) |
Geology -- United States --Maps (3) |
Jurassic - Ellis formation (3) |
Triassic - Ellis formation (3) |
Cambrian - Barker formation (2) |
Devonian - Monarch formation (2) |
Geology--Montana--Maps (2) |
Age/Period unspecified - Barker poryphyry; Pinto diorite; Heihart porphyry (1) |
Cambrian - Gallatin formation; Flathead formation (1) |