Correlations and facies changes in Lower and Middle Cambrian Tonto Group, Grand Canyon, Arizona, in Elston, D.P., Billingsley, G.H., and Young, R.A., eds., Geology of Grand Canyon, northern Arizona (with Colorado River guides)

Elston, D.P., 1989, Correlations and facies changes in Lower and Middle Cambrian Tonto Group, Grand Canyon, 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. 130-136.