Abstract
ABSTRACT In this paper, the Oligocene of the Upper Gulf Coast of Texas includes the Anahuac and Frio formations, and the Vicksburg group. The productive trend of these units in Railroad Commission District 3 extends in a band 40 to 50 miles wide paralleling the coast line from Jackson County on the southwest to the Sabine River on the northeast. The Frio accounts for the major portion of the production in this trend with minor amounts of production being derived from the Anahuac and Vicksburg. It is the opinion of the authors that the downdip limits of sand development in the Oligocene have been fairly well defined. These limits, in general, follow the present day coast line. Future exploration will undoubtedly find exceptional sand developments along the downdip limits of the Frio.
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