Usage:
Ben Lomond Quartz Diorite (CA)
quartz diorite of Ben Lomond (informal) (CA*)
For informal usage, the rank or lithologic term should not be capitalized.
Geologic age:
Cretaceous
Type section, locality, area and/or origin of name:
Notable exposures in coastal river basins between Half Moon Bay and Davenport, San Mateo and Santa Cruz Cos., western CA (US geologic names lexicon, USGS Bull. 1350).
[Probably named from Ben Lomond Mountain, Santa Cruz quadrangle (see Beveridge, 1960, Jour. Sed. Petrol., v. 30, no. 4, fig. 1; Leo, 1967, California Div. Mines Geol. Spec. Rpt., no. 91, p. 27-43).]
AAPG geologic province:
Santa Cruz 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 ([ ]).