Usage:
Shea Formation of Ash Creek Group (AZ)
Shea Basalt of Ash Creek Group (AZ*)
Geologic age:
Paleoproterozoic*
Type section, locality, area and/or origin of name:
[Named from excellent exposures] in vicinity of Shea Mine [just south of Copper Chief Mine, Cottonwood 7.5-min quadrangle], Jerome district, Yavapai Co., central AZ. Crops out southeast and east of Mingus Mountain. Southeastern exposures appear north and south of Black Canyon and in the canyon west of the Verde fault. Eastern exposures form continuous belt northward from Oak Wash to Mescal Gulch (Reber, 1938; see Anderson and Creasey, 1958).
AAPG geologic province:
Southwestern Basin-and-Range region*
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 ([ ]).