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An Analysis of Mesoscopic Structures in Selected Areas within the Potato Hills, Ouachita Mountains, Oklahoma
Structural field evidence indicates that the Potato Hills, located in the central zone of the Ouachita Moutains of Oklahoma, represent a series of fault-drag folds created by imbricate thrust faulting and back thrusting. An analysis of mesoscopic structures, combined with detailed mapping, reveals a complex structural and tectonic history of the area. Deformation in this area is the result of a progressive deformational event directed to the north to northwest. Thrust faults are found on either the north or south sides of major anticlines called fault-drag folds. These anticlines were created as lower Paleozoic strata were thrust over Mississippian and Pennsylvanian strata. All thrust faults, except the North Potato Hills thrust, are imbricate, north-directed thrusts from the Windingstair fault decollement. The North Potato Hills thrust is a south-directed back thrust. The Potato Hills are a direct result of movement on the Windingstair fault and represent a leading imbricate-fan thrust system. The Windingstair fault is the leading thrust in this system.
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