- Usage in publication:
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- Wrights Lake granodiorite
- Modifications:
-
- Named
- Geochronologic dating
- Dominant lithology:
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- Granodiorite
- AAPG geologic province:
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- Sierra Nevada province
Summary:
Shown on map of Fallen Leaf Lake 15' quad, El Dorado Co, CA. Underlies 40 sq mi in quad and extends several mi to south, west, and north, underlying 300 sq mi in all. Consists of coarse-grained hornblende-biotite granodiorite with poikilitic K-feldspar. Intrudes outliers of roof remnant, older diorites and gabbros, Pyramid Peak granite and Camper Flat and Lovers Leap granodiorites. K-Ar ages on biotite yielded 92.8 Ma and on hornblende yielded 97.6 Ma (Evernden and Kistler, 1970). Age given as 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 ([ ]).