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Crowder Formation
Geologic formation in California, United States From Wikipedia, the free encyclopedia
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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.[2]
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.[2][3][4]
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Geology
The Crowder Formation was formed during the Pliocene epoch of the Neogene period.[2][3] The formation was deposited by drainages carrying distinctive volcanic and metamorphic clasts from the Victorville area southward.[4]
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.[citation needed]
Fossils
The formation preserves fossils of insects, reptiles, rodents, birds, and larger mammals. The species date back to the Miocene and Pliocene epochs of the Neogene period.[5] 29 taxa were collected by the San Bernardino County Museum from the Cajon Pass area of the Crowder Formation.[3]
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See also
References
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