# Olmos Formation

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{{Short description|Geologic formation in Mexico}}
{{Infobox rockunit
| name           = Olmos Formation
| image          =
| caption        =
| type           = [Formation](/source/Formation_(stratigraphy))
| age            = [Late Campanian](/source/Campanian)-[Early Maastrichtian](/source/Maastrichtian)
| period         = Maastrichtian
| prilithology   =
| otherlithology =
| namedfor       =
| namedby        =
| region         = [Coahuila](/source/Coahuila), [Texas](/source/Texas)
| country        = [Mexico](/source/Mexico), [United States](/source/United_States)
| coordinates    =
| unitof         =
| subunits       =
| underlies      =
| overlies       =
| thickness      =
| extent         =
| area           =
| map            =
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}}
[[File:Austin Chalk stratigraphic column in Texas.png|thumb|300px|Olmos Formation [stratigraphic column](/source/stratigraphic_column) in Texas]]
The '''Olmos Formation''' is a [geologic formation](/source/Formation_(geology)) in [Mexico](/source/Mexico). It preserves [fossils](/source/fossils) of [plants](/source/plants), [hadrosaurs](/source/hadrosaurs) like ''[Kritosaurus](/source/Kritosaurus)'',<ref>{{Cite book |last=Lucas |first=Spencer G. |url=https://www.google.com/books/edition/Late_Cretaceous_Vertebrates_from_the_Wes/rCDYCQAAQBAJ?hl=en&gbpv=0 |title=Late Cretaceous Vertebrates from the Western Interior: Bulletin 35 |last2=Sullivan |first2=Robert M. |date=2006 |publisher=New Mexico Museum of Natural History and Science |page=273 |language=en}}</ref> [ceratopsians](/source/ceratopsians), [tyrannosaurs](/source/tyrannosaurs) and the turtle [''Palauchelys montellanoi''](/source/Palauchelys) dating back to the [Cretaceous](/source/Cretaceous) [period](/source/Period_(geology)).<ref>{{cite journal|last1=Estrada-Ruiz|first1=Emilio|last2=Martinez Cabrera|first2=Hugo I.|last3=RS Cevallos-Ferriz|first3=Sergio|title=Fossil woods from the late Campanian–early Maastrichtian Olmos Formation, Coahuila, Mexico |journal=Review of Palaeobotany and Palynology|date=June 2007|volume=145|issue=1|pages=123–133|doi=10.1016/j.revpalbo.2006.09.003|url=https://www.researchgate.net/publication/222248171}}</ref><ref>{{cite journal|last1=Upchurch|first1=G. R.|last2=Estrada-Ruiz|first2=E.|last3=Cevallos-Ferriz|first3=S. S.|title=Did tropical rainforest vegetation exist during the Late Cretaceous? New data from the late Campanian to early Maastrichtian Olmos Formation, Coahuila, Mexico.|journal=American Geophysical Union, Fall Meeting |volume=2008|pages=11D–07|date=December 2008|bibcode=2008AGUFMPP11D..07U}}</ref><ref>{{cite journal|last1=Estrada-Ruiz|first1=E.|last2=Martínez-Cabrera|first2=H.I.|last3=Cevallos-Ferriz|first3=S.R.|title=Upper Cretaceous woods from the Olmos Formation (late Campanian-early Maastrichtian), Coahuila, Mexico|journal=American Journal of Botany|date=July 2010|volume=97|issue=7|pages=1179–94|url=https://www.researchgate.net/publication/222248171|doi=10.3732/ajb.0900234|pmid=21616869}}</ref><ref>{{cite journal|last1=Alejandro Ramírez Velasco|first1=Angel|last2=Hernandez Rivera|first2=Rene|last3=Servin-Pichardo|first3=Ricardo|title=The Hadrosaurian Record from Mexico|journal=HADROSAURS, Chapter: Biogeography and Biostratigraphy|date=January 2014|pages=340–360|url=https://www.researchgate.net/publication/278018253}}</ref><ref>{{cite journal|last1=Gerardo Porras-Muzquiz|first1=Hector|last2=Lehman|first2=Thomas M.|title=A ceratopsian horncore from the Olmos Formation (early Maastrichtian) near Múzquiz, Mexico|journal=Revista Mexicana de Ciencias Geológicas|date=August 2011|volume=28|issue=2|pages=262–266|url=https://www.researchgate.net/publication/286279674}}</ref><ref>{{cite journal|last1=Ramírez-Velasco|first1=A. A|last2=Hernández-Rivera|first2=R.|title=Diversity of Late Cretaceous dinosaurs from Mexico|journal=Boletín Geológico y Minero|date=2015|volume=126|issue=1|pages=63–108|url=https://www.academia.edu/12268212|accessdate=28 September 2016}}</ref>

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

== References ==
{{Reflist}}
7. Oliver A. López-Conde, Adán Pérez-García, María L. Chavarría-Arellano, Jesús Alvarado-Ortega, A new bothremydid turtle (Pleurodira) from the Olmos Formation (upper Campanian) of Coahuila, Mexico, Cretaceous Research, Volume 119.
== External links ==
* {{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= 19 August 2022|archive-url= https://web.archive.org/web/20220819182839/https://www.fossilworks.org/|url-status= dead}}

Category:Geologic formations of Mexico
Category:Cretaceous Mexico
Category:Campanian Stage
Category:Maastrichtian Stage of North America

{{Mexico-geologic-formation-stub}}
{{Cretaceous-stub}}

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Adapted from the Wikipedia article [Olmos Formation](https://en.wikipedia.org/wiki/Olmos_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Olmos_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.