Usage:
Tunnel Spring Tuff (UT*)
Geologic age:
Tertiary*
Oligocene, early*
Type section, locality, area and/or origin of name:
Type section: in secs. 23, 24, 25, and 26, T. 23 N., R. 16 W., Crystal Peak quadrangle, Millard Co., UT (Bushman, 1973).
AAPG geologic province:
Great Basin 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 ([ ]).