Usage:
Robertson Formation of Mowich Group (OR*)
Geologic age:
Jurassic, Early*
Type section, locality, area and/or origin of name:
Type area: along headwaters of South Fork of Beaver Creek, 7 mi southeast of Suplee Post Office, in secs. 26, 27, 28, and 29, T. 18 S., R. 26 E., Crook Co., east-central OR. Named from Robertson Ranch, in sec. 28, T. 18 S., R. 26 E., Crook Co., east-central OR (Lupher, 1941).
AAPG geologic province:
Eastern 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 ([ ]).