Usage:
No current usage.
(†Rillito Andesite (AZ) replaced with /Safford Dacite. See Safford.)
Geologic age:
Tertiary
Type section, locality, area and/or origin of name:
Name applied to prominent cliff-former extending from cliffs west of Safford Peak to Silver Bell Pass, near north end of Tucson Mountain Range, Pima Co., southeastern AZ. [Origin of name not stated, but probably named from Rillito at north end of Tucson Mountain Range, in sec. 6, T. 12 S., R. 12 E., Marana 7.5-min quadrangle, Pima Co., southeastern AZ] (Brown, 1939).
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 ([ ]).