Usage:
Drewsey Formation (OR*)
Geologic age:
[?] Miocene*
[?] Pliocene*
Type section, locality, area and/or origin of name:
Type section: exposures in Table Mountain just north of town of Drewsey, Harney Co., and directly across Malheur River, southeastern OR. Formation lies mainly within northwest-southeast trending syncline that passes east of town of Drewsey and along west flank of Drinkwater Mountain (Shotwell and others, 1963).
AAPG geologic province:
Southern Oregon 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 ([ ]).