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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Arch Rock granite
  • Modifications:
    • Geochronologic dating
  • 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. 2123 (fig. 1). Arch Rock granite. Shown on map in paper dealing with potassium-argon dating of igneous rocks. Age shown on map legend as 95.3 millions of years. Oldest rock dated; older than Gateway granodiorite. [Calkins (1930, USGS Prof. Paper 160) referred to biotite granite of Arch Rock. Compiler was unable to locate reference to Arch Rock granite.]
Occurs in Yosemite National Park.

Source: US geologic names lexicon (USGS Bull. 1200, p. 127).


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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