The Barnes Conglomerate is the basal member of the 1.2 billion year old Dripping Spring Quartzite, which is part of the Mesoproterozoic Apache Group in east-central Arizona (mostly exposures are within a 50 mile radius of Globe).
Young, J.J., Spencer, J.E., MacFarlane, B.J., and Richard, S.M., 2009, Geologic Map of the Lookout Mountain 7.5’ Quadrangle, Pinal county, Arizona: Arizona Geological Survey Digital Geologic Map DGM-66, version 2.0, map scale 1:24,000, 14 p. and 1 map sheet. https://library.azgs.arizona.edu/item/ADGM-1552430490342-833
Photographer: Jon Spencer
Photo Date: circa 2010