Usage:
Hells Half Acre Tuff Member of Galiuro Volcanics (AZ*)
Geologic age:
Tertiary*
Oligocene, late* to Miocene, early*
Type section, locality, area and/or origin of name:
In Aravaipa Canyon, upstream from Javalina Canyon, in sec. 7, T. 6 S., R. 18 E., Pinal Co., AZ. Named from exposures on Hells Half Acre, in sec. 19, T. 6 S., R. 18 E., Pinal Co., AZ (Krieger, 1968).
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 ([ ]).