Usage:
Wasson Formation of Little Butte Volcanics (CA*,OR*)
Wasson Formation of Western Cascade Group (CA)
Geologic age:
Tertiary
Oligocene, late*
Type section, locality, area and/or origin of name:
Well exposed in Wasson Canyon and in amphitheater north of Brest Mountain, in T. 38 S., R. 2 E., Jackson Co., OR (Wells, 1956).
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 ([ ]).