Usage:
Topanga Group (CA*)
Topanga Formation (CA*)
Subunits:
GROUP STATUS (alphabetical) --all in CA*: Calabasas Formation, Conejo Volcanics, Topanga Canyon Formation.
FORMATION STATUS (alphabetical) --all in CA*: Bommer Member, Buzzard Peak Conglomerate Member, Los Trancos Member, Paularino Member.
Geologic age:
Tertiary
Miocene, middle*
Type section, locality, area and/or origin of name:
Topanga Canyon, 10 mi northwest of Santa Monica, Los Angeles Co., CA (Kew, 1924; Susuki, Takeo [abs.], GSA Bull., v. 63, no. 12, pt. 2).
AAPG geologic province:
Los Angeles 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 ([ ]).