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Now showing items 1-10 of 2
| Archean - unnamed strata (2) |
| Cambrian - Gallatin limestone; Flathead formation (2) |
| Devonian - Threeforks limestone (2) |
| Geology -- United States --Maps (2) |
| Paleogene - unnamed strata (2) |
| Silurian - Jefferson limestone (2) |
| Carboniferous - Madison limestone (1) |
| Carboniferous - Quadrant formation; Madison limestone (1) |
| Cretaceous - Laramie formation; Montana formation; Colorado formation; Dakota formation (1) |
| Cretaceous - Montana formation; Colorado formation; Dakota formation (1) |