Usage:
/Sumas Mountain subgroup [informal] of Chilliwack Group (WA)
["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Sumas Mountain subgroup considered informal and should not be capitalized.]
Geologic age:
Devonian
Type section, locality, area and/or origin of name:
Type area: Doaks Creek quarry on east side of Red Mountain, and quarry exposures on Sumas Mountain, Whatcom Co., WA (Danner, 1977).
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 ([ ]).