Geologic cross section from Gray Mountain to Moenkopi Wash of northern Arizona, by Billingsley and others.
Billingsley, G.H., Priest, S.S., and Felger, T.J, 2007, Geologic map of the Cameron 30' x 60' quadrangle, Coconino County, northern Arizona. U.S. Geological Survey Scientific Investigations Map SIM-2977, map scale 1:100,000.
ngmdb.usgs.gov/Prodesc/proddesc_93280.htm
Photographer: George Billingsley
Photo Date: 2007