From introduction: Objectives of the geologic studies and mapping in this area are: 1) to study and map geologic formations in which uranium ore may be found with special attention given to the Triassic Shinarump conglomerate, 2) to evaluate uranium deposits and to study local controls and habits of ore, 3) to collect and study geologic data basic to an understanding of regional geologic trends or controls in the distribution of the ore deposits, and 4) to determine the favorableness of the area for concealed deposits of uranium. The present report does not attempt to provide answers to all these objectives. Rather, it is a brief explanatory report to accompany the geologic map (fig. 2) and make it available in advance of the final report.