Now showing items 1-10 of 1

    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)