Usage:
Bright Angel Shale of Tonto Group (AZ*)
Bright Angel Shale (CA*,NV*,UT*)
Bright Angel Schist (CA*)
Subunits:
(alphabetical) --all in AZ: [?]Boucher Tongue, [?]Elves Chasm Tongue, Flour Sack Member*, [?]Garnet Canyon Tongue, [?]Lava Falls Tongue, Meriwitica Tongue* or Meriwitica Member, [?]Parashant Tongue, Tincanebits Tongue*.
Geologic age:
Cambrian, Early* (local)
Cambrian, Middle*
Type section, locality, area and/or origin of name:
Named from Bright Angel Canyon, in walls of which the formation is well exposed, Grand Canyon, [Bright Angel quadrangle], Coconino Co., northern AZ (Noble, 1914).
AAPG geologic province:
Plateau sedimentary province*
Salton basin*
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 ([ ]).