- Usage in publication:
-
- Ebbetts Pass granodiorite
- Modifications:
-
- Named
- Dominant lithology:
-
- Granodiorite
- AAPG geologic province:
-
- Sierra Nevada province
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).
- Usage in publication:
-
- Ebbetts Pass Granodiorite*
- Modifications:
-
- Geochronologic dating
- AAPG geologic province:
-
- Sierra Nevada province
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 ([ ]).