Southern Bradshaw Mountains | Yavapai County.
Framework-supported Miocene conglomerate composed of subrounded to subangular granitoid pebbles, cobbles, and boulders with interstitial sandy, orange-red, arkosic matrix. This is the basal unit of the Tertiary section in the southern Bradshaw Mountains. The clasts become more angular down-section as this rock grades to boulder-cobble sedimentary breccia, which unconformably overlies weathered and oxidized Paleoproterozoic granodiorite.
(Photo by Brad Johnson.)
Ferguson, C.A. and Johnson, B.J., 2014, Geologic map of the western half of the Columbia 7 ½' Quadrangle and the eastern half of the Copperopolis 7 ½' Quadrangle, Yavapai County, Arizona. Arizona Geological Survey Digital Geologic Map DGM-109, scale: 1:24,000. http://repository.azgs.az.gov/uri_gin/azgs/dlio/1581