Usage:
Bushnell Rock Formation of Umpqua Group (OR*)
Geologic age:
early Tertiary (early Eocene)
Type section, locality, area and/or origin of name:
Not stated. Best exposed in ridge extending from Tenmile Creek eastward across Porter Creek to Alexander Butte, Douglas Co., OR. Origin of name not stated by author, but probably named from Bushnell Rock, Douglas Co., OR (Baldwin, 1974).
AAPG geologic province:
Klamath Mountains province
Oregon-Washington Coast Ranges 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 ([ ]).