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Now showing items 1-10 of 2
| 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) |