Usage:
Willow Spring Granodiorite (AZ*)
Geologic age:
Precambrian*
Proterozoic, Early*
Proterozoic, Middle*
Type section, locality, area and/or origin of name:
Not designated. First used for a small isolated mass less than 1 sq mi, north of Webster Gulch, in northwest part of Globe quadrangle, Gila Co., AZ. Origin of name not stated by author, but probably named from Willow Spring Gulch, in T. 1 S., R. 14 E., Globe quadrangle, Gila Co., AZ (Ransome, 1903).
AAPG geologic province:
Southwestern Basin-and-Range region*
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 ([ ]).