Keyes, C.R., 1939, Deltaic anomaly of the Supai of the Grand Canyon: Pan-American Geologist, v. 71, no. 1, p. 55-62.
Pan-American Geologist, v. 71, no. 1, p. 55-62.
Stratigraphy, History, Sedimentary, Paleoenvironment, Sedimentary Petrology, [Supai Fm][Supai Group] - Pennsylvanian/Permian, (Aubrey Group) - Permian,