About 4,340 feet of marine strata, the Springer, Dornick Hills, Deese, and Hoxbar formations were deposited during the Pennsylvanian. The area was then subjected to folding and thrusting. An eastern block was complexly folded, overturned, and upthrust southwestward against a similar deformed but structurally higher autochthonous mass. Subsequent erosion of highs was followed by burial under 1,000–2,000 feet of Permian redbeds.

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