| Tejon Formation | |
|---|---|
| Stratigraphic range: Paleogene | |
| Type | Formation |
| Underlies | Ione Formation (regionally) |
| Overlies | Martinez Formation (regionally), Chico Formation (regionally) |
| Thickness | 2,100–2,300 feet (640–700 m) |
| Lithology | |
| Primary | conglomerate, shale |
| Location | |
| Region | California |
| Country | United States |
| Type section | |
| Named for | Fort Tejon |
The Tejon Formation is a Paleogene period geologic formation in California.
The formation regionally overlies the Martinez Formation or the Chico Formation. [1] Paleontology in the Tejon Formation indicates a more tropical climate than during the Martinez Formation's period, with fauna that flourished in its littoral conditions. [1]
It is predominantly found in the Fort Tejon area of the San Emigdio Mountains and Tehachapi Mountains in Kern County, and around Martinez in Contra Costa County. [1]
Areas it surfaces, south to north, include: [1]
It preserves prehistoric plant and fauna fossils dating back to the Paleogene period of the Cenozoic Era. [2]
Species (1897 taxa names) found only in the Tejon Formation include: [1]
The Tehachapi Mountains are a mountain range in the Transverse Ranges system of California in the Western United States. The range extends for approximately 40 miles (64 km) in southern Kern County and northwestern Los Angeles County and form part of the boundary between the San Joaquin Valley and the Mojave Desert.
The Tejon Pass, previously known as Portezuelo de Cortes, Portezuela de Castac, and Fort Tejon Pass is a mountain pass between the southwest end of the Tehachapi Mountains and northeastern San Emigdio Mountains, linking Southern California north to the Central Valley. Both the pass and the grade north of it to the Central Valley are commonly referred to as "the Grapevine". It has been traversed by major roads such as the El Camino Viejo, the Stockton – Los Angeles Road, the Ridge Route, U.S. Route 99, and now Interstate 5.
The San Emigdio Mountains are a part of the Transverse Ranges in Southern California, extending from Interstate 5 at Lebec and Gorman on the east to Highway 33–166 on the west. They link the Tehachapis and Temblor Range and form the southern wall of the San Joaquin Valley. The range is named after Emygdius, an early Christian martyr.
Elizabeth Lake is a natural sag pond that lies directly on the San Andreas Fault in the northern Sierra Pelona Mountains, in northwestern Los Angeles County, southern California.
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.
The Chico Formation is a geologic formation of the Campanian Age during the Cretaceous Period, found in California and southern Oregon.
El Camino Viejo a Los Ángeles, also known as El Camino Viejo and the Old Los Angeles Trail, was the oldest north-south trail in the interior of Spanish colonial Las Californias (1769–1822) and Mexican Alta California (1822–1848), present day California. It became a well established inland route, and an alternative to the coastal El Camino Real trail used since the 1770s in the period.
Tejon Creek, originally in Spanish Arroyo de Tejon, is a stream in Kern County, California. Its headwaters are located on the western slopes of the Tehachapi Mountains, and it flows northwest into the southern San Joaquin Valley.
Castac Lake, also known as Tejon Lake, is a natural saline endorheic, or sink, lake near Lebec, California. The lake is located in the Tehachapi Mountains just south of the Grapevine section of Interstate 5, and within Tejon Ranch. Normal water elevations are 3,482 feet (1,061 m) above sea level.
The Chatsworth Formation is a Cretaceous period sandstone geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.
The Hungry Valley Formation is a geologic formation in the San Emigdio Mountains — near Gorman in northeastern Los Angeles County, 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 Mission Valley Formation is a marine sandstone geologic formation in the Mission Valley region of southwestern San Diego County in Southern California.
The Poway Group is a geologic group in San Diego County, Southern California. It preserves fossils dating back to the Paleogene period.
The San Emigdio Formation is a geologic formation in California. It preserves fossils dating back to the Paleogene period.
The Santa Susana Formation is a Paleogene period geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.
The Stadium Conglomerate is a geologic formation in San Diego County, California. It is found at the northern end of Mission Valley near San Diego Stadium.
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