San Francisquito Formation | |
---|---|
Stratigraphic range: Maastrichtian-Danian ~ | |
Type | Geologic formation |
Underlies | Castaic & Punchbowl Formations |
Overlies | San Gabriel Basement Complex |
Thickness | 4 km (13,000 ft) |
Lithology | |
Primary | Sandy shale |
Location | |
Coordinates | 34°36′N118°36′W / 34.6°N 118.6°W |
Approximate paleocoordinates | 39°30′N96°30′W / 39.5°N 96.5°W |
Region | Los Angeles County, California |
Country | United States |
Extent | San Gabriel Mountains & Sierra Pelona Mountains |
The San Francisquito Formation is a geologic formation located in northern Los Angeles County, California. [1] [2]
Areas where it is exposed include: San Francisquito Canyon of the Sierra Pelona Mountains, as well as on the northwestern side of the Devil's Punchbowl gorge in the San Gabriel Mountains. [1] [2]
The San Francisquito Formation consists of marine deposits that originated during 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 Castaic Formation (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]
It preserves fossils dating back to the Paleogene period. [3]
Vasquez Rocks Natural Area Park is a 932-acre (377-hectare) park located in the Sierra Pelona in northern Los Angeles County, California. It is known for its rock formations, the result of sedimentary layering and later seismic uplift. It is located near the town of Agua Dulce, between the cities of Santa Clarita and Palmdale. The area is visible from the Antelope Valley Freeway. Its location approximately 25 miles (40 km) from downtown Los Angeles places it within Hollywood's "studio zone" and makes it a popular filming location for films and television programs.
The Sierra Pelona, also known as the Sierra Pelona Ridge or the Sierra Pelona Mountains, is a mountain ridge in the Transverse Ranges in Southern California. Located in northwest Los Angeles County, the ridge is bordered on the north by the San Andreas fault and lies within and is surrounded by the Angeles National Forest.
Devil's Punchbowl is a tilted sandstone formation on the northern slopes of the San Gabriel Mountains, in Los Angeles County, California, at an elevation of 4,750 feet (1,450 m).
The Merced Formation is a geologic formation in California, and also in Oregon and Washington state. It is named for Lake Merced, a natural lake on the western San Francisco coastline.
The Moraga Formation, also known as the Moraga Volcanics, is geological formation that dates back to the Pliocene epoch. It is located in Berkeley Hills, East Bay Region, San Francisco Bay Area, California.
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. It is found within Alameda County and Contra Costa County.
The Orinda Formation is a Miocene epoch geologic formation in the Berkeley Hills of the East Bay region of the San Francisco Bay Area, California.
The Punchbowl Formation is a sedimentary sandstone geologic formation in the northern San Gabriel Mountains, above the Antelope Valley in Los Angeles County, southern California.
The Etchegoin Formation is a Pliocene epoch geologic formation in the lower half of the San Joaquin Valley in central California.
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.
The Topanga Canyon Formation is a Miocene epoch geologic formation in the Santa Monica Mountains, Simi Hills, Santa Ana Mountains and San Joaquin Hills, in Los Angeles County, Ventura County, and Orange County, southern California. It is primarily composed of hard sandstone with some inter-bedded siltstone.
The Friars Formation is a geologic formation in San Diego County, Southern California.
The Llajas Formation is a non-marine to marine conglomerate geologic formation in Southern California.
The Martinez Formation is an Eocene Epoch geologic formation in California.
The Santa Susana Formation is a Paleogene period geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.
The Harold Formation is a geologic formation in the Central Mojave Desert, west of Victorville and north of the San Gabriel Mountains, in eastern San Bernardino County, Southern California.
The Palm Spring Formation is a Pleistocene Epoch geologic formation in the eastern Colorado Desert of Imperial County and San Diego County County, Southern California.
The Tick Canyon Formation (Tt) or Tick Canyon strata, is an Early Miocene geologic formation in the Sierra Pelona Ridge of the San Gabriel Mountains in Los Angeles County, California.
The Imperial Formation is the name of two distinct and unrelated geologic formations in North America, of different geologic Eras.
The Vasquez Formation (Tvz) is a geologic formation cropping out at the eponymous Vasquez Rocks in southern California. The formation dates to the Late Oligocene to Early Miocene.