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National Geologic Map Database

Geologic Unit: Las Posas

Usage:

Las Posas Formation (CA)


Subunits:

Long Canyon Member (CA).


Geologic age:

Quaternary (Pleistocene)


Type section, locality, area and/or origin of name:

Origin of name not stated by author, but probably named from Las Posas Hills, Ventura Co., south-central CA (Pressler, 1929).


AAPG geologic province:

Los Angeles basin
Ventura 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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).