Billingsley, G.H., and Elston, D.P., 1989, Geologic log of the Colorado River from Lees Ferry to Temple Bar, Lake Mead, Arizona, in Elston, D.P., Billingsley, G.H., and Young, R.A., eds., Geology of Grand Canyon, northern Arizona (with Colorado River guides): American Geophysical Union, International Geological Congress, 28th, Field Trip Guidebook T115/315, p. 1-36.