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The surface exposure of the Paleocene Wilcox Group in northeast Texas varies in width from 9 to 27 mi along an arcuate outcrop that extends southwest approximately 156 mi from the Texas-Arkansas State line to 32° latitude. Parts of Bowie, Camp, Cass, Franklin, Henderson, Hopkins, Morris, Navarro, Rains, Titus, Van Zandt, and Wood Counties are included in this outcrop belt (Figure 1). This area forms the northwestern flank of the East Texas Basin (Figure 2), the axis of which separates northeast Texas from the Sabine uplift structural area. The Wilcox Group dips south and southeast at 2° or less toward the axis of the East Texas Basin, with the exception of local salt-dome structures and a transcurrent structural high that extends from Monticello to Martin Lake (Figure 1).

The Wilcox Group conformably overlies the mudstone-dominated Midway Group, a marine unit of lower Paleocene age (Figure 3). In most of northeast Texas, the Wilcox is overlain and locally scoured by the Carrizo Sand of the Claiborne Group. Where the Car-rizo Sand is absent in extreme northeast Texas (Morris and Cass Counties, Figure 1), marine sandstone and mudstone deposits of the Reklaw Formation overlie the Wilcox Group (Figure 3). Holocene deposits overlie the Wilcox Group in areas of modern-day drainages. The thickness of the Wilcox Group in northeast Texas increases downdip from about 500 ft near the outcrop to approximately 2000 ft near the axis of the East Texas Basin

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