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Geology -- United States --Maps (3) |
Jurassic - Sundance formation (3) |
Neogene - unnamed strata (3) |
Triassic - Spearfish formation (3) |
Cambrian - Deadwood formation (2) |
Carboniferous - Minnekahta limestone; Opeche formation; Minnelusa sandstone; Pahasapa limestone (2) |
Geology -- South Dakota -- Pennington County -- Maps (2) |
Geology -- Wyoming -- Weston County -- Maps (2) |
Groundwater -- South Dakota -- Pennington County -- Maps (2) |
Groundwater -- Wyoming -- Weston County -- Maps (2) |