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    Archean - unnamed strata (1)
    Cambrian - Gallatin limestone; Flathead formation (1)
    Carboniferous - Quadrant formation; Madison limestone (1)
    Cretaceous - Laramie formation; Montana formation; Colorado formation; Dakota formation (1)
    Devonian - Threeforks limestone (1)
    Geology -- United States --Maps (1)
    Geology--Yellowstone National Park--Maps (1)
    Jurassic - Ellis formation: Tenton formation (1)
    Neogene - Electric intrusives; Trachytic rhyolite; Hot Spring formations; Lacustrine formation; Canyon conglomerate; Pinyon conglomerate; Sylvan intrusives (1)
    Paleogene - unnamed strata (1)