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National Geologic Map Database

Geologic Unit: Bonsall

Usage:

Bonsall Tonalite (CA*)


Geologic age:

Late Cretaceous*


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

Named from village of Bonsall located slightly west of central San Luis Rey 30- x 60-min quadrangle, San Diego Co., CA. Underlies approx. 100 sq mi in San Luis Rey quadrangle; also present in Elsinore and Ramona quadrangles (Hurlbut, 1935).


AAPG geologic province:

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