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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) |