Lower Miocene conglomerate and sandstone at the north end of the Gila Mountains east of Yuma in the Gila Mountains. Some of this strata contains placer gold deposits. (photo by Jon Spencer)
Online resource: Spencer, Jon E., Richard, Stephen M., and Shipman, Todd C., 2007, Geologic Map of the Fortuna 7.5' Quadrangle, Yuma County, Arizona: Arizona Geological Survey Digital Geologic Map DGM-55, version 1.0, map scale 1:24,000, 11 p., 1 map sheet. http://repository.azgs.az.gov/uri_gin/azgs/dlio/592
