Usage:
Sandy River Mudstone (OR*,WA*)
Geologic age:
Pliocene, early(?)
Type section, locality, area and/or origin of name:
Type area: along Clackamas River in Boring quadrangle downstream from point of contact with Rhododendron Formation, which is about 0.4 mi downstream from River Mill Dam, Boring quadrangle, northwestern OR. Named from exposures along Sandy River (Trimble, 1963).
AAPG geologic province:
Western Columbia basin
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 ([ ]).