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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Lovers Leap Granodiorite*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Sierra Nevada province
Publication:

John, D.A., Armin, R.A., Moore, W.J., and Dohrenwend, J.C., 1981, Geologic map of the Freel and Dardanelles Further Planning Area, Alpine and El Dorado Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map, MF-1322-A, 1 sheet, scale 1:62,500


Summary:

Lovers Leap Granodiorite of Loomis (1981) is shown on geologic map of Freel and Dardanelles Further Planning Area, El Dorado and Alpine Cos, CA. Consists of light-gray, fine- to medium-grained, porphyritic biotite granodiorite with abundant poikilitic potassium feldspar phenocrysts. Outcrops are typically unfoliated and diorite inclusions are uncommon. Age given as Late Cretaceous.

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


Map showing publication footprint
  • Usage in publication:
    • Lovers Leap granodiorite
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Granodiorite
  • AAPG geologic province:
    • Sierra Nevada province
Publication:

Loomis, A.A., 1981, Geology of the Fallen Leaf Lake 15-minute quadrangle, El Dorado County, California: California Division of Mines and Geology Map Sheet, 32, 2 sheets, 24 p., scale 1:62,500


Summary:

Lovers Leap hornblende-biotite granodiorite underlies 15 sq mi in south-central part of Fallen Leaf Lake 15' quad, El Dorado Co, CA. Extends into Silver Lake quad to south. Intruded by Wrights Lake and Bryan Meadow granodiorites. K-Ar age on biotite yielded 93.7 Ma (Evernden and Kistler, 1970). Age shown on map of quad is 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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