# Martinez Formation

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{{Short description|Eocene Epoch geologic formation in California}}
{{Infobox rockunit
| name           = Martinez Formation
| image          =
| caption        =
| type           = [Geologic formation](/source/Geologic_formation)
| age            = [Eocene](/source/Eocene)
| period         = Eocene
| prilithology   =
| otherlithology =
| namedfor       =
| namedby        =
| region         = [California](/source/California)
| country        = [United States](/source/United_States)
| coordinates    =
| unitof         =
| subunits       =
| underlies      = [Tejon Formation](/source/Tejon_Formation) (regionally),<br />[Ione Formation](/source/Ione_Formation) (regionally)
| overlies       = [Chico Formation](/source/Chico_Formation)
| thickness      =
| extent         =
| area           =
| map            =
| map_caption    =
}}

The '''Martinez Formation''' is an [Eocene Epoch](/source/Eocene) [geologic formation](/source/Formation_(geology)) in [California](/source/California).

==Geology==
The formation regionally overlies the [Chico Formation](/source/Chico_Formation) and regionally underlies the [Tejon Formation](/source/Tejon_Formation) or the [Ione Formation](/source/Ione_Formation).

It is exposed in the [Clevelin Hills](/source/Clevelin_Hills) in Riverside County, [Santa Ana Mountains](/source/Santa_Ana_Mountains) in Orange County, northwestern [Santa Monica Mountains](/source/Santa_Monica_Mountains) near [Calabasas (California)](/source/Calabasas%2C_California) in Los Angeles County, and north of [Mount Diablo](/source/Mount_Diablo)/south of the [Sacramento Delta](/source/Sacramento_Delta) in Contra Costa County.<ref>[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>

===Fossils===
The formation preserves [fossils](/source/fossils) dating back to the [Paleogene](/source/Paleogene) [period](/source/Period_(geology)).<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|archive-date= 25 March 2022|archive-url= https://web.archive.org/web/20220325060448/http://www.fossilworks.org/cgi-bin/bridge.pl?action=home|url-status= dead}}</ref>

==See also==
{{Portal|California|Paleontology}}
* [List of fossiliferous stratigraphic units in California](/source/List_of_fossiliferous_stratigraphic_units_in_California)
* {{C|Paleogene California}}
* [Paleontology in California](/source/Paleontology_in_California)

== References ==
{{Reflist}}

Category:Geologic formations of California
Category:Paleogene California
Category:Eocene Series of North America
Category:Geology of Contra Costa County, California
Category:Geology of Los Angeles County, California
Category:Geology of Orange County, California
Category:Geology of Riverside County, California
Category:Natural history of the Santa Monica Mountains
Category:Santa Ana Mountains

{{California-geologic-formation-stub}}
{{Paleogene-stub}}

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Adapted from the Wikipedia article [Martinez Formation](https://en.wikipedia.org/wiki/Martinez_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Martinez_Formation?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.