Keyes, Charles, 1922, Permian rocks of Grand Canyon: Pan-American Geologist, v. 38, no. 2, p. 147-149.
Pan-American Geologist, v. 38, no. 2, p. 147-149.
Stratigraphy, Correlation, Coconino Sandstone - Permian, (Aubrey Group), [Kaibab Fm][Kaibab Limestone],