Title: Stratigraphy of the Wichita group in part of the Brazos River Valley, north Texas
Subjects: Formations (Geology), Geology, Groups (Stratigraphy), Limestone, Sedimentary Rocks, Shale, Stratigraphic Geology
Places: Brazos River Valley, Texas, Wichita Group (Tex. and Okla.)
Time periods: Permian