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This article contains a structure map contoured on the top of the Dakota sandstone. The periods of tilting and folding are discussed along with the evidence for these structural deformations. Three cross sections are included to explain the structure and geologic history. Paleogeologic maps for the pre-Cretaceous and pre-Pennsylvanian surfaces are shown. The possible oil- and gas-producing zones of the Dakotas are discussed and compared with sands that are producing oil or gas in the surrounding states.
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