The Denver basin is a large asymmetric basin in Colorado, Nebraska, and Wyoming that contains a maximum of more than 13,000 feet of sediments of Paleozoic and Mesozoic age. During the Paleozoic and early Mesozoic eras normal marine and evaporitic sediments were deposited. In late Mesozoic time, deltaic deposits interfingered with normal marine deposits, and the present form of the basin emerged. The 'D' and 'J' sandstones of Cretaceous age are prolific producers of oil and gas.

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