Usage:
Chico Formation (CA*)
Subunits:
(alphabetical): --all in CA: Kinglsey Cave Member, Musty Buck Member, Ponderosa Way Member, Ten Mile Member.
Geologic age:
Late Cretaceous (Santonian to Campanian)*
Type section, locality, area and/or origin of name:
Type locality: in canyon of Chico Creek, 8 to 16 mi northeast of Chico, Butte Co., northern CA (Taff and others, 1940).
Typical localities: Chico Creek [Butte Co.], Pence's ranch, and Tuscan Springs, northern CA (Gabb, 1869).
AAPG geologic province:
Sacramento 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 ([ ]).