Pennsylvanian conglomerates in the Arbuckle Mountains, southern Oklahoma
Two formations illustrate the characteristics of Pennsylva-nian conglomerates in the Arbuckle Mountains of southern Oklahoma the Vanoss Formation and the Conings Ranch Conglomerate.
The Vanoss Formation is exposed on Bromide Hill in Platt National Park which is located on the southern edge of Sulphur and is easily reached by good roads from all directions (Fig. 1). To gain access to the area, follow U.S. 177 south from Sulphur into the park. Approximately 900 ft (300 m) inside the park boundary, immediately after crossing Rock Creek, turn west and follow the perimeter drive for about 1 mi (1.4 km) to Bromide Pavilion (Fig. 2).
The Conings Ranch Conglomerate is exposed on both sides of I-35 and in the median, approximately halfway between the Davis and Turner Falls turnoffs, and forms part of the magnificent Arbuckle Mountains road cuts (Fig. 1) (see also Fay, this volume). A rest area, which provides a lay person’s explanation of the geology, is conveniently located at the southern margin of the Conglomerate on the south lane of I-35. The principal outcrops are between Interstate Stations 2600 and 2630 as designated by the Oklahoma Department of Highways.
Figures & Tables
One of six volumes generated by each GSA section for the Decade of North American Geology (DNAG) project, this Centennial Field Guide contains descriptions of 100 sites or site clusters representing outstanding geologic locations in Arkansas, Kansas, Oklahoma, and Texas.