Usage:
S O Volcanics (AZ*)
Geologic age:
Tertiary*
Paleocene*
Eocene*
Oligocene*
Miocene*
Type section, locality, area and/or origin of name:
Exposed near S O Ranch, in sec. 20, T. 20 S., R. 24 E., Benson and Pearce quadrangles, central Cochise Co., southeastern AZ. Well exposed between south end of Hay Mountain and the hills southwest of Reeves Ranch, about 8 mi to northwest. Named from S O Ranch (Gilluly, 1956).
AAPG geologic province:
Pedregosa basin*
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 ([ ]).