Geology of Palm Valley quadrangle, Williamson County, Texas
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This paper presents a geologic study of the outcropping Cretaceous and Quaternary formations in the Palm Valley Quadrangle, Williamson County, Texas. The Cretaceous system is represented by the Georgetown, Del Rio, Buda, Pepper, Eagle Ford, and Austin formations. The Quaternary system consists of "Upland" gravels and "Brushy Creek" terrace. The Austin chalk is composed of the following zones in ascending order: Inoceramus subquadratus, Gryphaea wratheri, Inoceramus undulatoplicatus, Texanites internodosus, and Exogyra ponderosa. Faults of the Balcones system are discussed.