Usage:
Spud Mountain Formation of Mayer Group of Yavapai Supergroup (AZ)
Spud Mountain Volcanics of Big Bug Group (AZ*)
Geologic age:
Paleoproterozoic*
Type section, locality, area and/or origin of name:
Not designated. Representative section extends from Spud Mountain to Iron King Mine [in secs. 16, 17, 20 and 21, T. 13 N., R. 1 E.], Yavapai Co., AZ (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 ([ ]).