1. The Surprise Canyon Formation;Billingsley;AnUpper Mississippian and Lower Pennsylvanian (?) rock unit in the GrandCanyon of Arizona U.S. Geological Survey Bulletin 1605-A,1985
2. Bright Angel and Eminence faults, eastern Grand Canyon;Huntoon;Arizona Geological Society of America Bulletin,1975
3. Geologic map of the easternpart of Grand Canyon;Huntoon;Arizona Grand Canyon Natural History Association, scale 1:62,500,1986
4. Martin, D., 1985, Depositional systems and ichnology of the Bright Angel Shale(Cambrian), eastern Grand Canyon, Arizona [M.S. thesis]: Flagstaff, NorthernArizona University, 365 p.
5. The Coconino Sandstone; Its history and origin;McKee;Carnegie Institution of Washington Publication 440, Contributions to Paleontology,1934