Английская Википедия: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.[1]
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.[1][2][3]
Geology
The Crowder Formation was formed during the Pliocene epoch of the Neogene period.[1][2] The formation was deposited by drainages carrying distinctive volcanic and metamorphic clasts from the Victorville area southward.[3]
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.Шаблон: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.[4] 29 taxa were collected by the San Bernardino County Museum from the Cajon Pass area of the Crowder Formation.[2]
See also
References
- "The Physical and Magnetic Stratigraphy of the Miocene Crowder Formation, Cajon Pass, Southern California"; by Douglas Scott Winston, University of Southern California; Los Angeles, 1985.
Шаблон:California-geologic-formation-stub
Шаблон:Neogene-stub
- ↑ 1,0 1,1 1,2 Seismo.berkeley.edu: Field Guide to the Punchbowl Fault Zone, at Devil's Punchbowl Los Angeles County Park Шаблон:Webarchive; San Andreas Fault Resources; University of California, Berkeley; by Frederick M. Chester; January 1999.
- ↑ 2,0 2,1 2,2 San Bernardino County Museum: "Miocene Faunas in the Lower Crowder Formation", by R.E. Reynolds, 1984.
- ↑ 3,0 3,1 Caltech 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.
- ↑ Шаблон:Cite web
- Английская Википедия
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- Miocene Series of North America
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- Geologic formations of California
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