Usage:
Lookingglass Formation (OR)
Lookingglass Formation of Umpqua Group (OR)
Subunits:
(alphabetical) --all in OR: Bushnell Rock Member, Olalla Creek Member, Tenmile Member.
Geologic age:
Tertiary
Eocene, early
Eocene, middle
Type section, locality, area and/or origin of name:
Type section: exposures along Tenmile Creek, from Bushnell Rock south to Tenmile Butte, Reedsport quadrangle, Douglas Co., OR. Named from Lookingglass Valley (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 ([ ]).