The writers describe an area in western Upshur County, northeast Texas, where surface and subsurface evidence demonstrates the presence of an anticline having more than 100 feet of surface and 300 feet of subsurface closure. They trace the geologic history of this area through Cretaceous and Tertiary deposition and demonstrate that the anticline first became a structural trap in Wilcox time. They reach the conclusion that the structure was formed too late to allow accumulation of oil in the Woodbine sand.

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