# Almejas Formation

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Almejas_Formation
> Markdown URL: https://mediated.wiki/source/Almejas_Formation.md
> Source: https://en.wikipedia.org/wiki/Almejas_Formation
> Source revision: 1296709982
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Geologic formation in Mexico}}
{{Infobox rockunit
| name           = Almejas Formation
| image          =
| caption        =
| type           = [Formation](/source/Formation_(stratigraphy))
| age            = [Messinian](/source/Messinian)-[Zanclean](/source/Zanclean)<br />~{{fossil range|7.2|3.6}}
| period         = Pliocene
| prilithology   = [Sandstone](/source/Sandstone)
| otherlithology = [Conglomerate](/source/Conglomerate_(geology))
| namedfor       =
| namedby        =
| region         = [Baja California](/source/Baja_California)
| country        = Mexico
| coordinates    =
| unitof         =
| subunits       =
| underlies      =
| overlies       =
| thickness      =
| extent         =
| area           =
| map            =
| map_caption    =
}}

The '''Almejas Formation''' is a [geologic formation](/source/Formation_(geology)) in Mexico. It preserves [fossils](/source/fossils) dating back to the [Late Miocene](/source/Miocene) to [Early Pliocene](/source/Pliocene) of the [Neogene](/source/Neogene) [period](/source/Period_(geology)).

== Fossil content ==
Various fossils have been found in the formation:<ref name=FWArroyoDelphin>[https://paleobiodb.org/classic/displayCollResults?collection_no=13090 Arroyo Delphin] at [Fossilworks](/source/Fossilworks).org</ref>

=== Mammals ===
{{div col|colwidth=22em}}
* ''[Aivukus cedrosensis](/source/Aivukus)''
* ''[Albireo whistleri](/source/Albireo_whistleri)''
* ''[Balaenoptera sp.](/source/Balaenoptera)''
* ''[Denebola brachycephala](/source/Denebola_brachycephala)''
* ''[Dusignathus santacruzensis](/source/Dusignathus)''
* ''[Parapontoporia pacifica](/source/Parapontoporia)''
* ''[Piscolithax boreios](/source/Piscolithax)''
* ''[Piscolithax tedfordi](/source/Piscolithax)''
* ''[aff. Plesiocetus sp.](/source/Plesiocetus)''
* ''[Praekogia cedrosensis](/source/Praekogia)''
* ''[Thalassoleon mexicanus](/source/Thalassoleon)''
{{div col end}}

=== Birds ===
{{div col|colwidth=22em}}
* ''[Cerorhinca minor](/source/Cerorhinca_minor)''
* ''[Mancalla cedrosensis](/source/Mancalla)''
* ''[?Megapaloelodus opsigonus](/source/Megapaloelodus)''
* ''[Morus sp.](/source/Morus_(bird))''
* ''[Puffinus tedfordi](/source/Puffinus)''
* ''[?Synthliboramphus sp.](/source/Synthliboramphus)''
{{div col end}}

=== Fishes ===
{{div col|colwidth=22em}}
* ''[Carcharodon cf. carcharias](/source/Carcharodon)''
* ''[Carcharhinus sp.](/source/Carcharhinus)''
* [Megalodon](/source/Megalodon)
{{div col end}}

== See also ==
{{Portal|Earth sciences|Geology|Mexico|Paleontology}}
* [List of fossiliferous stratigraphic units in Mexico](/source/List_of_fossiliferous_stratigraphic_units_in_Mexico)

== References ==
{{reflist}}

Category:Geologic formations of Mexico
Category:Neogene Mexico
Category:Sandstone formations
Category:Conglomerate formations of Mexico
Category:Fossiliferous stratigraphic units of North America
Category:Paleontology in Mexico
Category:Baja California

{{Mexico-geologic-formation-stub}}
{{Neogene-stub}}

---
Adapted from the Wikipedia article [Almejas Formation](https://en.wikipedia.org/wiki/Almejas_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Almejas_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.