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National Geologic Map Database

Geologic Unit: Bommer

Usage:

Bommer Member of Topanga Formation (CA*)


Geologic age:

Miocene*


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

In large fault block extending from upper Moro Canyon to mouth of Bommer Canyon, Orange Co., south-central CA. Named from Bommer Canyon, which joins Sand Canyon Wash at north margin of San Joaquin Hills (Vedder and others, 1957).


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