Usage:
Duppa 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: Duppa section D, below Duppa Butte in Kwagunt Canyon [labeled Kwagunt Valley on some topographic maps; approx. Lat. 36 deg. 14 min. 15 sec. N., Long. 111 deg. 53 min. 00 sec. W., northeastern corner Walhalla Plateau 7.5-min quadrangle], eastern Grand Canyon, Grand Canyon National Park, Coconino Co., northern AZ (Ford and Breed, 1973).
Named from Duppa Butte, [approx. Lat. 36 deg. 14 min. 28 sec. N., Long. 111 deg. 53 min. 58 sec. W., northeastern corner Walhalla Plateau 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 ([ ]).