Usage:
Pettus Lake Member of Fort Rock Formation (OR)
Geologic age:
Tertiary
Pliocene, early
Type section, locality, area and/or origin of name:
Type section: exposure west of Seven Mile Ridge and Pettus Lake, in SE/4 NW/4 sec. 5, T. 28 S., R. 17 E., Lake Co., OR (Colbath and Steele, 1982).
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 ([ ]).