Billingsley, G.H., Hendricks, J.D., and Lucchitta, I., 1987, Field guide to the lower Grand Canyon, from Peach Springs to Pierce Ferry, Arizona, in Davis, G.H., and VandenDolder, E.M., eds., Geologic diversity of Arizona and its margins: Excursions to choice areas; Field-trip guidebook, 100th Annual Meeting, The Geological Society of America, Phoenix, Arizona, October 26-29, 1987: Arizona Bureau of Geology and Mineral Technology Special Paper 5, p. 20-38.
