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