Lithology, thickness, and lithofacies of the Late Mississippian Wesley Formation of the Jackfork Group indicate sedimentation within a narrow transition zone along the northwest slope of the Ouachita trough. The formation thins northwestward, and sandstone beds included within it converge and intertongue with spiculite. Restoral of position of measured sections to fit within a uniform rate of convergence suggests total displacement by the Ouachita overthrusting of only 20-30 miles.

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