Filter by: Subject
Now showing items 1-10 of 4
Archean - unnamed strata (4) |
Carboniferous - Quadrant formation; Madison limestone (4) |
Geology -- United States --Maps (4) |
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) |