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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) |