Geologic Map of the Central Gila Bend Mountains, West-Central Arizona v. 2.0

This report includes a 1:24,000 scale geologic map of a portion of the central Gila Bend Mountains. The map covers portions of the Fourth of July Butte, Gillespie, and Quail Springs Wash 7.5' quadrangles and was produced as part of the U. S. Geological Survey - Arizona Geological Survey Cooperative Geologic Mapping (COGEOMAP) Program. The goal of this ongoing program is to map areas for which inadequate geologic information exists. The central part of the Gila Bend Mountains was chosen because it had previously been mapped only at reconnaissance scale, and has been recently explored for its metallic mineral resources. This report is part of a digital republication of a 1991 geologic map originally created as part of COGEOMAP, a cooperative geologic mapping project between the U.S. Geological Survey and the Arizona Geological Survey. Preparation for republication was conducted by students from the University of Arizona with financial support from the U.S. Geological Survey, National Geological and Geophysical Data Preservation Program (G22AP00222) and included the production of a new GIS geodatabase and a revised map layout. The following text report has not been altered and remains identical to the 1991 original, but there may be situations where unit names, ages, symbology, or other geologic information contained within this report do not match the information presented in the new map layout or GIS geodatabase.