Two Lower Paleozoic groups, Arbuckle and Wichita Mountains, Oklahoma

This paper establishes two groups—Timbered Hills and Arbuckle—for the lower Paleozoic formations of the Arbuckle and Wichita mountains of Oklahoma. The Timbered Hills group is divided into three formations, and the Arbuckle into nine formations and two members. A brief description is given, and a type section designated for each formation. The three formations of the Timbered Hills group and four in the Arbuckle group are assigned to the Upper Cambrian, and the other five formations of the Arbuckle group to the Lower Ordovician. A table shows the classification proposed by the writer compared with earlier classifications.