Usage:
Tygh Valley Formation of Dalles Group (OR)
Geologic age:
Tertiary
Miocene, middle to Pliocene
Type section, locality, area and/or origin of name:
Type section not designated.
Reference section: north-facing roadcut along Tygh Valley-Wamic Road, in sec. 4, T. 4 S., R.13 E., Wasco Co., OR. Named from the town of Tygh Valley, in sec. 3, T. 4 S., R. 13 E. (Farooqui and others, 1981).
AAPG geologic province:
Columbia 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 ([ ]).