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Mulholland Formation
Geologic formation in the San Francisco Bay area From Wikipedia, the free encyclopedia
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The Mulholland Formation is a Pliocene epoch geologic formation in the Berkeley Hills and San Leandro Hills of the East Bay region of the San Francisco Bay Area, California.[1] It is found within Alameda County and Contra Costa County.[1]
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Geology
It overlies the Bald Peak Basalt formation, and underlies the Pleistocene epoch Leona Rhyolite formation.[1] It is composed of siltstone, sandstone, and conglomerates. It has fluviatile and lacustrine deposits.[1]
Descending under the Bald Peak Basalt formation are the Pliocene epoch units of the Siesta Formation, Moraga Formation, and Orinda Formation.[1] Below the Orinda are the local Miocene epoch units of the Monterey Formation Group: Tice Shale, Oursan Sandstone, Claremont Shale, and Sobrante Sandstone.[1]
Fossils
The Mulholland Formation preserves fossils dating back to the Neogene period.[2]
Other local formations
- Units of other local formations in the Berkeley and San Leandro Hills, in descending geologic column order from higher/younger to lower/older, include:[1]
- Local Late/Upper Cretaceous−Pliocene units of the Chico Formation:
- Redwood Canyon Formation — sandstone, shale, and conglomerate.
- Shephard Creek Formation — shale and sandstone.
- Oakland Conglomerate — conglomerate, exposed on Skyline Boulevard.
- Joaquin Miller Formation — sandstone, shale, and conglomerate.
- Knoxville Conglomerate
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See also
References
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