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Crowder Formation : ウィキペディア英語版 | Crowder Formation
The Crowder Formation is a geologic formation in the Central and Western Mojave Desert, in northern Los Angeles County and eastern San Bernardino County, in Southern California.〔( Seismo.berkeley.edu: Field Guide to the Punchbowl Fault Zone, at Devil's Punchbowl Los Angeles County Park ); San Andreas Fault Resources; University of California, Berkeley; by Frederick M. Chester; January 1999.〕 Areas where it is exposed include at the bases of the northern San Gabriel Mountains and northwestern San Bernardino Mountains, and in the Cajon Pass between them.〔〔(San Bernardino County Museum: "Miocene Faunas in the Lower Crowder Formation" ), by R.E. Reynolds, 1984.〕〔(Cal Tech Thesis: "Neotectonics of the north frontal fault system of the San Bernardino Mountains, southern California : Cajon Pass to Lucerne Valley" ), Meisling, Kristian Erik (1984), Dissertation (Ph.D.), California Institute of Technology.〕 ==Geology== The Crowder Formation was formed during the Pliocene epoch of the Neogene period.〔〔 The formation was deposited by drainages carrying distinctive volcanic and metamorphic clasts from the Victorville area southward.〔 It overlies the crystalline San Gabriel Basement Complex in its eastern section, and the San Francisquito Formation in its western section in the Antelope Valley/San Gabriels.
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