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Lower Atoka deposition in the McAlester basin of Oklahoma is influenced by two down-to-the-basin growth faults similar to those which have been reported from the Gulf Coast of Texas and Louisiana. Across these faults, from the upthrown northern to the downthrown southern side, there are abrupt increases in the thickness of the Atoka Formation. The increase is about 2,000 feet across the Kinta fault and 3,000-3,500 feet across the Sans Bois fault.
Structural and stratigraphic electric-log cross sections and surface geologic maps indicate that the faulting ceased to exhibit growth characteristics at about the time of deposition of the middle Atoka. The Hartshorne near-surface folding is more intense than the folding of the deeper Wapanucka Limestone, suggesting that plastic flow of the Atoka has occurred.
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