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Archean - unnamed strata (1) |
Cambrian - Barker formation (1) |
Carboniferous - Quadrant formation; Madison limestone (1) |
Cretaceous - Montana formation; Eagle formation; Colorado formation; Dakota formation; Cascade formation (1) |
Devonian - Monarch formation (1) |
Geology -- United States --Maps (1) |
Geology--Montana--Maps (1) |
Jurassic - Ellis formation (1) |
Neogene - Stanford conglomerate (1) |
Post-Cretaceous - Highwood syenite; Wolf porphyry; Barker porphyry (1) |