The rocks and fossils of the Mesozoic, a brief statement, in Breed, W.J., and Roat, E.C., eds., Geology of the Grand Canyon

Colbert, E.H., 1974, The rocks and fossils of the Mesozoic, a brief statement, in Breed, W.J., and Roat, E.C., eds., Geology of the Grand Canyon: Flagstaff, Museum of Northern Arizona, and Grand Canyon Natural History Association, p. 77-80.