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| Age/Period unspecified - Barker poryphyry; Pinto diorite; Heihart porphyry (1) |
| Archean - unnamed strata (1) |
| Cambrian - Barker formation (1) |
| Carboniferous - Quadrant formation; Madison limestone (1) |
| Cretaceous - Livingston formation; Laramie formation; Yellowstone formation; Cascade formation (1) |
| Devonian - Monarch formation (1) |
| Geology -- United States --Maps (1) |
| Geology--Montana--Maps (1) |
| Jurassic - Ellis formation (1) |
| Neogene - Castle granite; Robinson diorite; Smith River lake beds (1) |