... covering the slopes and tall grass present on most ridge crests. Geological mapping by Otton and Zielinski (13) show the area to be underlain by interbedded shale, siltstone, and sandstone. ... resistant sandstone units typically form the hill crests. Hill slopes are underlain by shale, siltstone, and thin sandstone beds. The geologic and climatic settings of the Lester and Branstetter ... Issues and Solutions in Exploration, Production and Refining, Albuquerque, NM: Integrated Petroleum Environmental Consortium (IPEC) and the University of Tulsa, Continuing Engineering and Science...