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Map showing publication footprint
  • Usage in publication:
    • Mt. Hole granodiorite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Granodiorite
  • AAPG geologic province:
    • Peninsular Ranges province
Publication:

Larsen, E.S., Jr., 1948, Batholith and associated rocks of Corona, Elsinore, and San Luis Rey quadrangles, southern California: Geological Society of America Memoir, 29, 182 p., (incl. geologic map, scale 1:125,000)


Summary:

Named for characteristic outcrops on Mt. Hole, northeast of Corona, Riverside Co, CA. [Name Mount [note spelling] Hole granodiorite first used by Larsen and Keevil (1947) in study of batholith of southern CA]. Rock weathers into huge light-colored boulders of disintegration. Carries inclusions of Woodson Mountain granodiorite (new); therefore younger than Woodson Mountain. Chemical analysis included. Map legend shows age as Cretaceous.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Mount Hole granodiorite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Peninsular Ranges province
Publication:

Larsen, E.S., Jr., Gottfried, David, Jaffe, H.W., and Waring, C.L., 1958, Lead-alpha ages of the Mesozoic batholiths of western North America, IN Investigations of western batholiths: U.S. Geological Survey Bulletin, 1070-B, p. B35-B62.


Summary:

Sample of Mount Hole granodiorite from east of Mount Hole yielded Pb-alpha age of approximately 95 Ma. Twenty-five age determinations on rocks from batholith of southern CA, ranging from tonalite to granite, give mean age of 110 +/-13 Ma; geologic evidence indicates this batholith is early Late Cretaceous in age.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


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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