Breed, W.J., and Ford, T.D., 1973, Chapter Two-and-a-half of Grand Canyon history, or the Sixty Mile Formation: Plateau, v. 46, no. 1, p. 12-18.
Breed, W.J., and Ford, T.D.
Plateau, v. 46, no. 1, p. 12-18.
Megabreccia, Landslide, Structure, (Sixty Mile Fm)Sixtymile Fm - Grand Canyon Supergroup - Late Proterozoic,