Usage:
Kachess Rhyolite (WA)
(†Kachess Rhyolite abandoned by the USGS. Replaced with Silver Pass Volcanic Member of the Swauk Formation. See Silver Pass.)
Geologic age:
Tertiary
Eocene
Type section, locality, area and/or origin of name:
Not designated. Named from Kachess Lake [Kachess Lake 7.5-min quadrangle] Kittatas Co., WA (Smith and Calkins, 1906).
AAPG geologic province:
Cascades 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 ([ ]).