April Luncheon - Bo Henk, TCU Dept. of Geosciences

The purpose of this study is to determine the depositional environments of the Woodbine Group in North Texas, Prior interpretations have included fluvial, deltaic and shallow marine environments for the Dexter, Lewisville and Arlington Fms, respectively. Our investigation utilized two USGS cores and numerous outcrops. The USGS has taken two cores, the USGS GC-2 core from Dallas County and the USGS GC-4 core from Fannin County, Both cores penetrated the upper 150 feet of the Woodbine. Sedimentology and Ichnology were utilized to determine depositional environments. The same holds true for the numerous outcrops and measured sections at Lake Grapevine and elsewhere in Tarrant and Denton counties. Prior work from previous investigators, combined with new measured sections were used to construct a clearer understanding of the Stratigraphy. Outcrop work, compared with earlier investigations, was greatly enhanced by developing new techniques to clear the outcrop faces allowing for much higher resolution of…