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., southern 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).