San Francisquito Formation
| San Francisquito Formation Stratigraphic range: Maastrichtian-Danian ~ | |
|---|---|
| Type | Geologic formation |
| Underlies | & Punchbowl Formations |
| Overlies | |
| Thickness | 4 km (13,000 ft) |
| Lithology | |
| Primary | Sandy shale |
| Location | |
| Coordinates | 34°36′N 118°36′W / 34.6°N 118.6°WCoordinates: 34°36′N 118°36′W / 34.6°N 118.6°W |
| Approximate paleocoordinates | 39°30′N 96°30′W / 39.5°N 96.5°W |
| Region | Los Angeles County, California |
| Country |  United States |
| Extent | San Gabriel Mountains & Sierra Pelona Mountains |
  San Francisquito Formation (the United States) | |
The San Francisquito Formation is a geologic formation in northern Los Angeles County, California.[1][2]
Areas where it is exposed include: San Francisquito Canyon of the Sierra Pelona Mountains, and the northwestern side of the Devil's Punchbowl gorge in the San Gabriel Mountains.[1][2]
Geology[]
The San Francisquito Formation is from marine deposits of the Late Cretaceous period of the Mesozoic Era, and the Early Paleocene epoch in the Paleogene period of the Cenozoic Era.[1][2] It is overlain by the Punchbowl Formation (east) and (west), both of the Miocene and Pliocene epochs.[1] It overlies the crystalline San Gabriel Basement Complex.[1]
It is found between the San Andreas Fault on its north, and the Devil's Punchbowl Fault on its south.[1][2] The Pliocene epoch Crowder Formation is to the northeast.[1]
Fossil content[]
It preserves fossils dating back to the Paleogene period.[3]
See also[]
- Geology of Los Angeles County, California
- List of fossiliferous stratigraphic units in California
- Paleontology in California
- Neenach Volcano
References[]
- ^ a b c d e f g 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.
- ^ a b c d AAPG Datapages/Archives: "Stratigraphy and Sedimentology of the Type San Francisquito Formation, Southern California"; Department of Earth Sciences, University of California, Riverside; 1982.
- ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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- Geologic formations of California
- Cretaceous California
- Paleogene California
- Maastrichtian Stage of North America
- Danian Stage
- Cretaceous–Paleogene boundary
- Shale formations
- Geology of Los Angeles County, California
- San Gabriel Mountains
- Sierra Pelona Ridge
- California geologic formation stubs
- Paleogene stubs