Usage:
Donovan Formation (OR)
Geologic age:
Jurassic, Early
Type section, locality, area and/or origin of name:
Exposures occupy less than 0.5 sq mi, in secs. 5, 6, 7, and 8, T. 20 S., R. 30 E., 19 mi north of Burns and 10 mi west of Crow Flat Ranger Station. Named from Tim Donovan Ranch, in sec. 7, T. 20 S., R. 30 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 ([ ]).