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  • Usage in publication:
    • Avawatz Mountains Quartz Monzodiorite*
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Quartz monzonite
    • Granodiorite
    • Granite
  • AAPG geologic province:
    • Mojave basin
Publication:

Spencer, J.E., 1990, Geologic map of the southern Avawatz Mountains, northeastern Mojave Desert region, California: U.S. Geological Survey Miscellaneous Field Studies Map, MF-2117, 1 sheet, scale 1:24,000


Summary:

Named for Avawatz Mountains. Type locality designated as exposures along wash above Sheep Creek Spring between 2000 and 2800 ft elev., NW/4 T17N R6E, Avawatz Pass 15' quad, San Bernardino Co, CA. Consists of granitoid rocks ranging from quartz monzodiorite to quartz monzonite to granodiorite to granite. Equivalent to (informal) Avawatz quartz monzodiorite of Spencer (1981, 1987). Age is Jurassic based on U/Pb zircon age of 177 +/-10 Ma.

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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