Grater, R., and Hawkins, H.H., 1935, Rock slide in the Coconino sandstone: Grand Canyon Nature Notes, v. 9, p. 368-369.
Grater, R., and Hawkins, H.H.
Grand Canyon Nature Notes, v. 9, p. 368-369.
Rock Avalanche, Sedimentary Structure, Coconino Sandstone - Permian, (Aubrey Group),