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Carboniferous - Quadrant formation; Madison limestone (2) |
Geology -- United States --Maps (2) |
Paleogene - unnamed strata (2) |
Archean - unnamed strata (1) |
Cambrian - Gallatin limestone; Flathead formation (1) |
Cambrian - Red Lion formation; Hasmark formation; Silver Hill formation; Flathead quartzite (1) |
Cretaceous - Colorado formation; Kootenai formation (1) |
Cretaceous - Laramie formation; Montana formation; Colorado formation; Dakota formation (1) |
Devonian - Jefferson limestone (1) |
Devonian - Threeforks limestone (1) |