Usage:
Hoko River Formation of Twin River Group (WA*)
Geologic age:
Tertiary
Eocene, late*
Type section, locality, area and/or origin of name:
Type locality: exposures in stream bed and cliffs of Hoko River, and in railway and roadcuts parallel to the river, from point 1 km north of junction of Blue Canyon with Hoko River south to point 1.5 km north of Hoko Falls Bridge, in northwest Olympic Peninsula, Clallam Co., WA (Snavely and others, 1978).
AAPG geologic province:
Olympic Mountains 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 ([ ]).