Tejon Formation
| 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.
Geology[edit]
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]
Occurrences[edit]
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]
- Santa Ana Mountains
- Santa Monica Mountains — near Calabasas.
- Simi Hills — eastern section
- Santa Susana Mountains — section in northwestern Simi Valley
- Santa Clara River Valley — Rancho Camulos area
- Topatopa Mountains — Sespe gorge area
- Fort Tejon area of the San Emigdio Mountains and Tehachapi Mountains
- San Joaquin Valley−Diablo Range — New Idria Mercury Mine area
- Mount Diablo — northern area
- Martinez area on the Sacramento Delta
- Clear Lake — Lower Lake area
Fossils[edit]
It preserves prehistoric plant and fauna fossils dating back to the Paleogene period of the Cenozoic Era.[2]
Species[edit]
Species (1897 taxa names) found only in the Tejon Formation include:[1]
- Cardita horni
- Fusus sequileteralis
- Megistostigma striata
- Modiola ornata
- Morio tuberculatus
- Telina martinezensis
- Telina horni
- Thracia karquinezensis
- Turritella conica
- Turritella infragranulata
- Tritonium eocenicum
See also[edit]
- List of fossiliferous stratigraphic units in California
- Paleogene California
- Paleontology in California
References[edit]
- ^ a b c d e Google Books: "The stratigraphic and faunal relations of the Martinez formation to the Chico and Tejon of Southern California", Clarence A. Waring; Stanford University Dept. of Geology; Jun 4, 2011 . accessed 1.16.2016.
- ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
 | This article about a specific stratigraphic formation in California is a stub. You can help Wikipedia by expanding it. |
- Paleogene California
- Geology of Kern County, California
- Geology of Los Angeles County, California
- Geology of Orange County, California
- Geology of San Benito County, California
- Geology of Ventura County, California
- Geography of the San Joaquin Valley
- Natural history of the Santa Monica Mountains
- San Emigdio Mountains
- Simi Hills
- Tehachapi Mountains
- Geologic formations of California
- California geologic formation stubs
- Paleogene stubs