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Carboniferous - Forelle limestone; Satanka shale; Casper formation (1) |
Cretaceous - Mesaverde formation; Steele shale; Niobrara limestone; Benton shale; Cloverly formation; Fox Hills sandstone; Pierre shale; Morrison formation (1) |
Geology -- United States --Maps (1) |
Geology -- Wyoming -- Maps (1) |
Jurassic - Morrison formation; Sundance formation (1) |
Neogene - Arikaree formation; Brule clay; Chadron sandstone (1) |
Paleogene - Arikaree formation; Brule clay; Chadron sandstone (1) |
Permian - Chugwater formation (1) |
Pre-Cambrian - Sherman granite (1) |
Triassic - Chugwater formation (1) |