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Geologic Unit: Hoffmann
Map showing publication footprint
  • Usage in publication:
    • Hoffmann quartz monzonite
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Quartz monzonite
  • AAPG geologic province:
    • Sierra Nevada province
Publication:

Evernden, J.F., Curtis, G.H., and Lipson, J., 1957, Potassium-argon dating of igneous rocks: American Association of Petroleum Geologists Bulletin, v. 41, no. 9, p. 2120-2127. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Pg. 2122, 2123 (fig. 1). Hoffmann quartz monzonite. Shown on map in paper dealing with potassium-argon dating of igneous rocks. Age shown on map legend as 83.3 millions of years. Shows intrusive relationships toward older Cathedral Peak granite but does not come into contact with younger Johnson granite porphyry. [Age is Cretaceous.]
[Type locality not stated.] Occurs in Yosemite National Park, eastern CA.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1775).


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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