Usage:
Cowlitz Formation (OR*,WA*)
Subunits:
(alphabetical) [not adopted by USGS]: Goble Member (WA) or Goble Volcanics Member (OR,WA), Olequa Creek Member (WA), Pe Ell Volcanics Member (WA), Stillwater Creek Member (WA).
Geologic age:
Tertiary
Eocene, middle*
Eocene, late*
Type section, locality, area and/or origin of name:
Type section: canyon of Olequa Creek between towns of Winlock and Olequa, in southwestern Lewis Co., and northwestern Cowlitz Co., WA (Weaver, 1937).
AAPG geologic 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 ([ ]).