Usage:
Lummi Formation (WA)
/Lummi Group (WA)
[A "group" consists of 2 or more formations (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
Subunits:
James Island Formation (WA).
Geologic age:
Late Jurassic to Early Cretaceous
Type section, locality, area and/or origin of name:
Type area: exposures on Lummi Island, eastern San Juan Islands, Whatcom Co., WA (Vance, 1975).
AAPG geologic province:
Bellingham basin
Northern Cascade Range-Okanagan province
Puget Sound 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 ([ ]).