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Geologic Unit: Le Conte
Map showing publication footprint
  • Usage in publication:
    • LeConte gneiss
  • Modifications:
    • Named
  • Dominant lithology:
    • Metagabbro
    • Gneiss
  • AAPG geologic province:
    • Cascades province
Publication:

Tabor, R.W., 1962, The crystalline geology of the area south of Cascade Pass, northern Cascades Mountains, Washington: Dissertation Abstracts, v. 22, no. 9, p. 3160.


Summary:

LeConte gneiss crops out along southwestern margin of central belt south of Cascade Pass, Northern Cascade Mountains WA. Consists of Marblemount meta-quartz diorite [!], metagabbro, subordinate schistose hornblendite, and trondhjemitic gneiss. Grades eastward into Magic Mountain gneiss (new). May be correlative with pre-Devonian crystalline basement complex (Yellow Aster unit). A high-angle fault, LeConte fault, separates low-grade LeConte gneiss from medium-grade metasedimentary rocks of first belt (Snowking-Dome Peak massifs).

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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