The most striking structural feature of the basin area east of the Arbuckle Mountains is a normal fault system and a complex network of fault blocks. Structures in the basin are similar to those in the mountains and probably resulted from the Ouachita, Wichita, and Arbuckle orogenies. The oil-producing structures in the area are sharp anticlinal features bounded by normal faults which control the entrapment of hydrocarbon accumulations.

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