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  • Usage in publication:
    • Glen Creek Gabbro-Ultramafic Complex*
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Gabbro
    • Peridotite
  • AAPG geologic province:
    • Klamath Mountains province
Publication:

Irwin, W.P., Wolfe, E.W., Blake, M.C., Jr., and Cunningham, C.G., Jr., 1974, Geologic map of the Pickett Peak quadrangle, Trinity County, California: U.S. Geological Survey Geologic Quadrangle Map, GQ-1111, 1 sheet, scale 1:62,500


Summary:

Named for exposures on Glen Creek, sec.24 T1S R7E near Forest Glen, Pickett Peak 15' quad, Trinity Co, CA. Consists chiefly of medium-grained to pegmatitic gabbro and hornblendite with serpentinized peridotite (peridotite indicated separately on map of quad). Isotopic age on hornblende from gabbro yielded 147 +/-9 Ma. Age given as Jurassic.

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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