View source for Tejon Formation

{{Infobox rockunit
| name           = Tejon Formation
| image          =
| caption        =
| type           = [[Formation (stratigraphy)|Formation]]
| age            =  [[Paleogene]]
| period         = Paleogene
| prilithology   = [[conglomerate (geology)|conglomerate]], [[shale]]
| otherlithology =
| namedfor       = [[Fort Tejon]]
| namedby        =
| region         = [[California]]
| country        = [[United States]]
| coordinates    =
| unitof         =
| subunits       =
| underlies      =Ione Formation (regionally)
| overlies       =[[Martinez Formation]] (regionally),<br />[[Chico Formation]] (regionally)
| thickness      ={{convert|2100|-|2300|ft|m}}
| extent         =
| area           =
| map            =
| map_caption    =
}}

The '''Tejon Formation''' is a [[Paleogene]] [[Period (geology)|period]] [[Formation (geology)|geologic formation]] in [[California]].

==Geology==
The formation regionally overlies the [[Martinez Formation]] or the [[Chico Formation]].<ref name=waring>[https://books.google.com/books?id=s84QAAAAIAAJ&dq=Martinez+Formation&pg=PA6   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.</ref>  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.<ref name=waring/>

===Occurrences===
It is predominantly found in the [[Fort Tejon]] area of the [[San Emigdio Mountains]] and [[Tehachapi Mountains]] in [[Kern County]], and around [[Martinez, California|Martinez]] in [[Contra Costa County]].<ref name=waring/>

Areas it surfaces, south to north, include:<ref name=waring/>
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*[[Santa Ana Mountains]]
*[[Santa Monica Mountains]] — near Calabasas.
*[[Simi Hills]] — eastern section
*[[Santa Susana Mountains]] — section in northwestern [[Simi Valley, California|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, California|Martinez]] area on the [[Sacramento Delta]]
*[[Clear Lake (California)|Clear Lake]] — [[Lower Lake, California|Lower Lake]] area
{{colend|colwidth=30em}}

==Fossils==
It preserves [[prehistoric plant]] and fauna [[fossil]]s dating back to the Paleogene period of the [[Cenozoic Era]].<ref>{{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= ((Various Contributors to the Paleobiology Database))|url= https://www.fossilworks.org|access-date= 17 December 2021}}</ref>

===Species=== 
Species (1897 taxa names) found only in the Tejon Formation include:<ref name=waring/>
{{colbegin|colwidth=26em}}
* [[Cardita]] horni
* [[Fusus]] sequileteralis
* [[Megistostigma]] striata
* [[Modiola]] ornata
* [[Morio]] tuberculatus
* [[Telina]] martinezensis
* Telina horni
* [[Thracia]] karquinezensis
* [[Turritella]] conica
* Turritella infragranulata
* [[Tritonium]] eocenicum
{{colend|colwidth=26em}}

==See also==
{{Portal|California|Paleontology}}
* [[List of fossiliferous stratigraphic units in California]]
* {{C|Paleogene California}}
* [[Paleontology in California]]

==References==
{{Reflist}}

{{-}}

[[Category:Paleogene California]]
[[Category:Geology of Kern County, California]]
[[Category:Geology of Los Angeles County, California]]
[[Category:Geology of Orange County, California]]
[[Category:Geology of San Benito County, California]]
[[Category:Geology of Ventura County, California]]
[[Category:Geography of the San Joaquin Valley]]
[[Category:Natural history of the Santa Monica Mountains]]
[[Category:San Emigdio Mountains]]
[[Category:Simi Hills]]
[[Category:Tehachapi Mountains]]
[[Category:Geologic formations of California]]


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