Usage:
High Cascade Group (CA,OR,WA)
High Cascade Volcanics (CA)
Subunits:
GROUP STATUS (alphabetical) --all in CA: Copco Basalt, Plutos Cave Basalt.
Geologic age:
Holocene
Pleistocene
Pliocene
Type section, locality, area and/or origin of name:
Occurs south of Mount Hood, Cascade Range, OR (Callaghan, 1933).
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 ([ ]).