Usage:
Stevens Mountain Rhyolite (AZ*)
Geologic age:
Triassic, Late*
Jurassic, Early*
Type section, locality, area and/or origin of name:
On Stevens Mountain, in sec. 34, T. 17 S., R. 10 E., Pima Co., AZ (Cooper, 1971).
AAPG geologic province:
Basin-and-Range 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 ([ ]).