Prolific oil and gas production is obtained in the Sho-Vel-Tum area of eastern Stephens and western Carter Counties, Oklahoma, from rocks of Permian, Pennsylvanian, Mississippian, Siluro-Devonian, and Ordovician ages. This large, complexly folded and faulted area is in the northwest part of the Ardmore basin between the Arbuckle Mountains on the east and Wichita Mountains on the west. The first production was discovered in July 1914 from Permian rocks at a depth of 400 ft in Sec. 21, T. 3 S., R. 2 W. The area has had two periods of major structural movement: post-Morrow, pre-Deese; and post-Hoxbar, pre-Cisco. Production is from stratigraphic traps, fault closures, anticlines, and combinations of these. Geologically this is one of the most interesting areas of the world, a d economically it has produced 742,835,000 bbl of oil with an estimated reserve of 158,288,000 bbl. The area is still active and new reserves are being found.

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