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National Geologic Map Database

Geologic Unit: Cowlitz

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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).