Usage:
South Mountains Granodiorite (AZ*)
Geologic age:
Tertiary, middle*
Type section, locality, area and/or origin of name:
Along Summit road, 500 m northeast of Telegraph Pass, on main ridge of mountains. Named from South Mountains, Maricopa Co., AZ (Reynolds, 1985).
Reference localities designated in Maricopa Co., AZ: (1) east flank Dobbins Lookout, in sec. 16, T. 1 S., R. 3 E.; (2) roadcuts in center SW/4 sec. 16, T. 1 S., R. 3 E.; and (3) cuts along first 100 m of Hidden Valley Trail, in SE/4 NW/4 sec. 15, T. 1 S., R. 3 E.
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 ([ ]).