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  • Usage in publication:
    • Bull Canyon Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Gneiss
    • Schist
    • Marble
  • AAPG geologic province:
    • Peninsular Ranges province
Publication:

Brown, A.R., 1981, Structural history of the metamorphic, granitic and cataclastic rocks in the southeastern San Jacinto Mountains, IN Brown, A.R., and Ruff, R.W., eds., Geology of the San Jacinto Mountains: South Coast Geological Society Guidebook, October 10-11, 1981, no. 9, p. 100-138.


Summary:

Is named for metamorphic rocks in type locality in Bull Canyon, sec.34 T6S R4E, Idyllwild 15' quad, San Jacinto Mountains, Riverside Co, CA. Named first used (thesis, Brown, 1968) and mapped in Brown (1980). Is older(?) formation of Desert Divide Group. Consists of interlayered gneiss, schist, quartzite, marble, and calc-silicate hornfels. Is approx. 5500 ft. thick. Conformably(?) underlies Ken Quartzite. Intruded by quartz monzonite. Assigned Paleozoic(?) age based on stratigraphic relations.

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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