Tejon Formation
The Tejon Formation is a Paleogene period geologic formation in California.
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 |
Geology
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
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
It preserves prehistoric plant and fauna fossils dating back to the Paleogene period of the Cenozoic Era.[2]
Species
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
- List of fossiliferous stratigraphic units in California
- Paleogene California
- Paleontology in California
References
- 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.
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