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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Ebbetts Pass granodiorite
  • Modifications:
    • Named
  • Dominant lithology:
    • Granodiorite
  • AAPG geologic province:
    • Sierra Nevada province
Publication:

Wilshire, H.G., 1957, Propylitization of Tertiary volcanic rocks near Ebbetts Pass, Alpine County, California: University of California Publications in Geological Sciences, v. 32, no. 4, p. 243-271.


Summary:

Fig. 1. Ebbetts Pass granodiorite. Shown on geologic sketch map of Ebbetts Pass region, Alpine County, California. Age given as pre-Tertiary.

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


Map showing publication footprint
  • Usage in publication:
    • Ebbetts Pass Granodiorite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Sierra Nevada province
Publication:

Robinson, A.C., and Kistler, R.W., 1986, Maps showing isotopic dating in the Walker Lake 1 degree x 2 degrees quadrangle, California and Nevada: U.S. Geological Survey Miscellaneous Field Studies Map, MF-1382-N, 1 sheet, 49 p., scale 1:125,000


Summary:

K-Ar age on biotite from Ebbetts Pass Granodiorite yielded 88.3 +/-1.0 Ma; sample collected 38 deg 38' 00"N, 119 deg 56' 22"W. K-Ar age on hornblende yielded 94.6 +/-2.0 Ma; sample collected at 38 deg 31' 42"N, 119 deg 54' 10"W. [Based on U.S. Geological Survey Geologic Time Chart, 1986 age is Late Cretaceous]

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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