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| Archean - unnamed strata (1) |
| Cambrian - Gallatin limestone; Flathead formation (1) |
| Carboniferous - Madison limestone (1) |
| Cretaceous - Montana formation; Colorado formation; Dakota formation (1) |
| Devonian - Threeforks limestone (1) |
| Geology -- United States --Maps (1) |
| Geology -- Wyoming -- Maps (1) |
| Neogene - Ishawooa dikes; Sunlight dikes; Sunlight intrusives (1) |
| Paleogene - unnamed strata (1) |
| Silurian - Jefferson limestone (1) |