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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) |