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Geologic Unit: Holcomb
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  • Usage in publication:
    • Holcomb quartz monzonite*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Quartz monzonite
  • AAPG geologic province:
    • Mojave basin
Publication:

Noble, L.F., 1954, Geology of the Valyermo quadrangle and vicinity, California: U.S. Geological Survey Geologic Quadrangle Map, GQ-50, 1 sheet, scale 1:24,000


Summary:

Holcomb quartz monzonite. Light-gray to pinkish quartz monzonite, probably varying to granodiorite; cut by aplite and pink pegmatite. Texture normal granitic north of Hidden Springs and Holcomb faults; south of faults, limestone, granodiorite, and rooks of Pleasant View complex are injected by the quartz monzonite. Age is Cretaceous(?).
Type locality: Holcomb Ridge, Valyermo quadrangle, southern CA. Monzonlte is continuous with granitic rocks north of San Andreas Fault in Pearland quadrangle, southern CA.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1779).


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 ([ ]).

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