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Groundwater -- Wyoming -- Weston County -- Maps (1) |
Jurassic - Sundance formation (1) |
Jurassic - Unkpapa sandstone; Sundance formation (1) |
Neogene - Chadron formation (1) |
Neogene - unnamed strata (1) |
Paleogene - Chadron formation (1) |
Triassic - Spearfish formation (1) |
Triassic - Spearfish shale (1) |