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| Carboniferous - Minnekahta limestone; Opeche formation; Hartville formation; Guernsey formation (1) |
| Cretaceous - Graneros formation; Dakota sandstone (1) |
| Geology -- United States --Maps (1) |
| Geology--Wyoming--Laramie County--Maps (1) |
| Jurassic - Morrison clay; Sundance formation (1) |
| Neogene - Arikaree formation (1) |
| Paleogene - Brule formation; Chadron formation (1) |
| Proterozoic - Whalen group (1) |
| Triassic - Spearfish shale (1) |