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{{Short description|Late Cretaceous geological formation in Arizona}}
{{Infobox rockunit
| name = Fort Crittenden Formation
| image =
| caption =
| type = [[Geological formation]]
| age = [[Late Cretaceous]]
| prilithology =
| otherlithology =
| namedfor =
| namedby =
| region = [[North America]]
| country = United States
| coordinates =
| unitof =
| subunits =
| underlies = [[Salero Formation]]
| overlies =
| thickness =
| extent =
| area =
| map =
| map_caption =
}}

The '''Fort Crittenden Formation''' is a geological [[Formation (geology)|formation]] in Arizona whose strata date back to the [[Late Cretaceous]]. Dinosaur remains are among the fossils that have been recovered from the formation.<ref name="cretaceousdistribution">Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): ''The Dinosauria'', 2nd, Berkeley: University of California Press. pp. 574–88. {{ISBN|0520242092}}.</ref>

==Vertebrate paleofauna==

===Amphibians===
{| class="wikitable" align="center" width="100%"
|-
! colspan="7" align="center" |'''[[Amphibian]]s of the Fort Crittenden Formation'''
|-
! Genus
! Species
! Location
! Stratigraphic position
! Abundance
! Notes

|-
|
''[[Opisthotriton]]''
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Indeterminate
|
|
|
|

|-
|
''[[Scapherpeton]]''
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Indeterminate
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|
|
|
|-
|}

===Archosaurs===
[[Tyrannosauridae]] fossils attributed to ''[[Gorgosaurus]]'' have been unearthed here.<ref>{{Cite journal |last=Miller |first=Halsey W. |date=1964 |title=Cretaceous Dinosaurian Remains from Southern Arizona |url=https://www.jstor.org/stable/1301559 |journal=Journal of Paleontology |volume=38 |issue=2 |pages=378–384 |issn=0022-3360}}</ref><ref>{{Cite journal |last=Heckert |first=Andrew B. |last2=Lucas |first2=Spencer G. |last3=Krzyzanowski |first3=Stan E. |date=2003-04-10 |title=Vertebrate fauna of the late Campanian (Judithian) Fort Crittenden Formation, and the age of Cretaceous vertebrate faunas of southeastern Arizona (U.S.A.) |url=https://doi.org/10.1127/njgpa/227/2003/343 |journal=Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen |volume=227 |issue=3 |pages=343–364 |doi=10.1127/njgpa/227/2003/343 |issn=0077-7749|url-access=subscription }}</ref>
{| class="wikitable" align="center" width="100%"
|-
! colspan="7" align="center" |'''[[Archosaur]]s of the Fort Crittenden Formation'''
|-
! Genus
! Species
! Location
! Stratigraphic position
! width="25%" | Abundance
! width="25%" | Notes
! Images
|-
|
Alligatoridae
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Indeterminate
|
|
|
Known only from a single scute.
|
Paleontologists Robert M. Sullivan and Spencer G. Lucas questioned the referral to this specimen to ''Allognathosuchus'' in the formation because the referred remains were so scant and ''Allognathosuchus'' is confined to the Paleogene. They regarded the referred scute as belonging to an indeterminate alligatoroid.
| rowspan="99" |
[[File:Crittendenceratops shaded.jpg|thumb|center|200px|''[[Crittendenceratops]]'']]
|-
|
[[Hadrosauridae]]<ref name="cretaceousdistribution" /><ref>D’Emic, M.D., Wilson, J.A., and Thompson, R. 2010. "The end of the sauropod dinosaur hiatus in North America". ''Palaeogeography, Palaeoclimatology, Palaeoecology'' 297: 486–90.</ref><ref>{{Cite journal |last=Heckert |first=Andrew B. |last2=Lucas |first2=Spencer G. |last3=Krzyzanowski |first3=Stan E. |date=2003-04-10 |title=Vertebrate fauna of the late Campanian (Judithian) Fort Crittenden Formation, and the age of Cretaceous vertebrate faunas of southeastern Arizona (U.S.A.) |url=https://doi.org/10.1127/njgpa/227/2003/343 |journal=Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen |volume=227 |issue=3 |pages=343–364 |doi=10.1127/njgpa/227/2003/343 |issn=0077-7749|url-access=subscription }}</ref><ref name=":0">{{Cite journal |last=Miller |first=Halsey W. |date=1964 |title=Cretaceous Dinosaurian Remains from Southern Arizona |url=https://www.jstor.org/stable/1301559 |journal=Journal of Paleontology |volume=38 |issue=2 |pages=378–384 |issn=0022-3360}}</ref>
|
Indeterminate<ref name="cretaceousdistribution" /><ref name=":0" />
|
|
|
|These teeth were attributed to ''[[Trachodon|Trachodon mirabilis]]'' in the past.
|-
|
''[[Crittendenceratops]]''
|
''C. krzyzanowskii''<ref>Sebastian G. Dalman; John-Paul M. Hodnett; Asher J. Lichtig; Spencer G. Lucas (2018). "A new ceratopsid dinosaur (Centrosaurinae: Nasutoceratopsini) from the Fort Crittenden Formation, Upper Cretaceous (Campanian) of Arizona". ''New Mexico Museum of Natural History and Science Bulletin''. 79: 141–64.</ref>
|
|
A centrosaurine ceratopsid.
|
|
|-
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cf. ''[[Richardoestesia]]''
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Indeterminate
|
|
|
|
|-
|
Dromaeosauridae
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Indeterminate
|
|
|
|
|-
|}

===Bony fishes===

{| class="wikitable" align="center" width="100%"
|-
! colspan="7" align="center" |'''[[Bony fishes]] of the Fort Crittenden Formation'''
|-
! Genus
! Species
! Location
! Stratigraphic position
! Abundance
! Notes
! Images
|-
|
''[[Melvius]]''
|
Indeterminate
|
|
|
|
| rowspan="99" |
[[File:Pachyrhizodus caninus skeletons.JPG|thumb|center|150px|''[[Pachyrhizodus]]'']]
|-
|
''[[Pachyrhizodus]]''
|
Indeterminate
|
|
|
|
|-
|}

===Cartilaginous fishes===
{| class="wikitable" align="center" width="100%"
|-
! colspan="7" align="center" |'''[[Cartilaginous fishe]]s of the Fort Crittenden Formation'''
|-
! Genus
! Species
! Location
! Stratigraphic position
! Abundance
! Notes

|-
|
''[[Myledaphus]]''
|
''M. bipartitus''
|
|
|
|

|-
|}

===Lepidosaurs===
Teiid and anguid lizards are known from the formation.

===Turtles===

{| class="wikitable" align="center" width="100%"
|-
! colspan="7" align="center" |'''[[Turtle]]s of the Fort Crittenden Formation'''
|-
! Genus
! Species
! Location
! Stratigraphic position
! Abundance
! Notes

|-
|
''[[Adocus]]''
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|
|
|
|

|-
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''[[Aspideretes]]''
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|
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|
|
|-
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''[[Basilemys]]''
|
|
|
|
|
|-
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''[[Plastomenus]]''
|
|
|
|
|
|-
|}

==See also==
{{Portal|Earth sciences|Paleontology|Dinosaurs||}}
* [[List of dinosaur-bearing rock formations]]

==Footnotes==
{{Reflist}}

==References==
* Sullivan, R.M., and Lucas, S.G. 2006. "[http://www.nmnaturalhistory.org/science/bulletins/35/sci_bulletin35_2.pdf The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America]{{dead link|date=January 2017 |bot=InternetArchiveBot |fix-attempted=yes }}." ''New Mexico Museum of Natural History and Science, Bulletin'' 35:7–29.
* Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. {{ISBN|0520242092}}.

{{Coord|31.8234|-110.6404|display=title}}

[[Category:Campanian Stage]]
[[Category:Cretaceous Arizona]]

{{Arizona-geologic-formation-stub}}
{{paleo-site-stub}}

Fort Crittenden Formation - Revision history

imported>OAbot: Open access bot: url-access updated in citation with #oabot.