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The Wesley Formation (Late Mississippian) was studied in order to make a stratigraphic appraisal of the amount of northward overthrusting in the Ouachita Mountains of Oklahoma. As the formation is traced south and east from its type locality (close to the frontal Ouachitas), it becomes thinner, includes more light-colored shale, has fewer and thinner spiculite strata, and the number and thickness of sandstone beds increase. The Wesley shales are interpreted to be equivalent to the upper part of the Caney Shale of the frontal zone. Deposition was on or very near the northwestern slope of the Ouachita trough. The original sedimentary convergence of the Ouachita sediments is significant in explaining the stratigraphic relations observed today between the Ouachitas and the ad acent areas. This convergence, estimated for the northwestern Ouachitas, was about 100 feet per mile for the Stanley and Jackfork together and 20-30 feet per mile for one formation in the Jackfork Group, the Markham Mill. Limited thrusting (20-30 miles) of an initially narrow transition zone seems to be indicated.
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