Devonian and Mississippian rocks cover most of the central part of the Colorado Plateau. The Devonian rests on Cambrian rocks and the contact is a disconformity. The three major units of the Devonian in ascending order are the Aneth, Elbert, and Ouray Formations; the Ouray is both Devonian and Mississippian. The major unit of the Mississippian is the Redwall Formation.

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