ABSTRACT

Stratigraphic profiles and isopach data from the Hunton Group indicate that approximately twenty miles of left-slip has occurred along the Washita Valley Fault since the Middle Devonian. South of the Washita Valley Fault, a post-Hunton, pre-Woodford structural-erosional feature with Hunton absent over a broad crestal area is employed as a piercement point, and is correlated with an area of thin Hunton on the block north of the fault. Restoring these features to adjacency results in positive similarities across the fault for thickness values and trends, as well as stratigraphic relationships. The configuration of major Pennsylvanian folded structures as a consequence of this restoration is conditionally acceptable for assigning all or almost all of the twenty mile displacement to the Middle to Upper Pennsylvanian (Desmoinesian-Virgilian) orogeny. Orogenic sediments expected from such a displacement are confined to this time-stratigraphic position in the Arbuckle Mountain region.