- Usage in publication:
-
- Grand Canyon group
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Sandstone
- Greenstone
- Limestone
- Lava
- AAPG geologic province:
-
- Southern Rocky Mountain region
Summary:
Pg. 440-441. Grand Canyon group in Grand Canyon series. Divided Grand Canyon series into two unconformable groups, the upper of which he named Chuar group and the lower Grand Canyon group.
[GNC remark (US geologic names lexicon, USGS Bull. 896, p. 851): Subsequently he replaced latter term (Grand Canyon group) with Unkar group, the name by which it is now known. See Unkar.]
Source: US geologic names lexicon (USGS Bull. 896, p. 851).
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 ([ ]).