Usage:
Ajo Volcanics (AZ*)
Geologic age:
Oligocene and/or Miocene*
Type section, locality, area and/or origin of name:
Named from exposures at Ajo Peaks, in sec. 32, T. 12 S., R. 6 W., Ajo quadrangle, Pima Co., southwestern AZ. Caps Ajo Peaks; makes up hills west and southwest of Ajo Peaks and extends for about 3 mi in low range of hills southeastward from peaks (Gilluly, 1937).
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 ([ ]).