Usage:
Tanner Member of Galeros Formation of Chuar Group of Grand Canyon Supergroup (AZ*)
Geologic age:
Neoproterozoic*
Type section, locality, area and/or origin of name:
Type section: Tanner section A, in cliffs of Basalt Canyon above Tanner Rapids, [approx. Lat. 36 deg. 06 min. 45 sec. N., Long. 111 deg. 50 min. 45 sec. W., Desert View 7.5-min quadrangle], eastern Grand Canyon, Grand Canyon National Park, Coconino Co., northern AZ (Ford and Breed, 1973).
Named from Tanner Rapids, Colorado River [labeled Tanner Canyon Rapids on post-2000 topographic maps; approx. Lat. 36 deg. 06 min. 12 sec. N., Long. 111 deg. 50 min. 06 sec. W., Desert View 7.5-min quadrangle], eastern Grand Canyon, Grand Canyon National Park, Coconino Co., northern AZ (Ford and Breed, 1973).
AAPG geologic province:
Plateau sedimentary province*
Southern Rocky Mountain region*
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 ([ ]).