This six-sheet set of oversize colorful geologic maps and cross sections presents new interpretations on the outcrop pattern and complex structure within the Upper Cretaceous Del Rio, Buda, Boquillas, Pen, Aguja, Javelina, and Cretaceous-Tertiary Black Peaks Formations of Big Bend National Park. The maps show many of the popular areas for tourist (and field-trip) visitation within the park.

Although the mature, supergiant East Texas field on the west flank of the Sabine Uplift has been producing from the Upper Cretaceous (Cenomanian) siliciclastic Woodbine Group for more than 75 years, no modern comprehensive geologic study of it has been completed. This report presents results of an integrated geologic and reservoir-engineering analysis of the Woodbine interval in the field and adjacent East Texas Basin.