Usage:
Sixtymile Formation of Grand Canyon Supergroup (AZ*)
Geologic age:
Neoproterozoic*
Type section, locality, area and/or origin of name:
Type section: topmost part of Nankoweap Butte, and on north side of Sixty Mile Canyon and Awatubi Canyon, west of Colorado River, Lat. 36 deg. 12 min. 00 sec. N., Long. 111 deg. 50 min. 00 sec. W., Coconino Co., AZ (Ford and Breed, 1973).
AAPG geologic province:
Southern Rocky Mountain region*
Plateau sedimentary province*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).