PETROGRAPHIC AND STRATIGRAPHIC ANALYSIS ALONG THE LOWER CRETACEOUS STRATA, IN KIMBLE COUNTY TEXAS
Nine stratigraphic sections were measured along Interstate 10 and U.S Highway 377 in Kimble County, Texas to analyze the lithostratigraphic, sequence stratigraphic, petrographic, and paleotologic deposition. Three sequences were determined based on disconformites. The Upper Hensel Formation contact with the Lower Glen Rose Formation is based on the uppermost red bed of the Hensel Formation, forming Sequence 1. Sequence 2 begins at the mudstones atop of the Hensel Formation and end at the burrowed mudstone unit, this sequence represents the Glen Rose Formation. Sequence 3 extends from claystones atop of the burrowed unit of the Glen Rose Formation and terminates at the disconformable contact with the Fort Terrett Formation, representing the Walnut Formation. Petrographic evidence indicates that marine diagenesis is prevalent. Common bivalves in the area were Ceratostreon texana, which are index fossils for the Walnut Formation and provided substantial evidence for the placement of the Walnut Formation in Kimble County, Texas.