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{{Short description|Geological formation in Uzbekistan}}
{{Multiple issues|
{{refimprove|date=December 2024}} {{refimprove|date=December 2024}}
{{copy edit|date=December 2024}} {{Incomplete list|date=December 2024|science}}
⚫ }}
{{Infobox rockunit {{Infobox rockunit
| name = Aitym formation | name = Aitym Formation
| period = Cretaceous | period = Cretaceous
| age = ?] | age = ?] <br />~{{Fossilrange|86|83}}
| image = | image =
| imagesize = | imagesize =
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| underlies = | underlies =
| overlies =] | overlies =]
| thickness = up to {{Cvt|30|m|ft}} | thickness = up to <!-- ] -->
| area = | area = ]
| map = | map = {{Location map+ | Uzbekistan
| relief = 1
| map_caption =
| width = 250
| float = center
| places =
{{Location map~ | Uzbekistan
| lat_deg = 42.07
| lon_deg = 62.39
| mark = Lightgreen pog.svg
| marksize = 10}}
| map_caption = Location of the Aitym Formation
<!----Location----> <!----Location---->
| location = | location = ]
| coordinates = <!-- {{Coord| N 42°07′24″|N|  E 62°39′29″|E|display=inline}} --> | coordinates = <!-- {{Coord|42.07|N|62.39|W|display=inline}} -->
| region =] | region ={{Flag|Uzbekistan}}
| country = ] | country = Uzbekistan
| extent = <!-- {{Convert||mi|km}}--> | extent = <!-- {{Convert||mi|km}}-->
<!--Type section---> <!--Type section--->
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| year_ts = <!--Year of definition--> | year_ts = <!--Year of definition-->
| location_ts = <!--Place,mountain,...--> | location_ts = <!--Place,mountain,...-->
| coordinates_ts = <!-- {{Coord||N|"N 42°07′24″|E| "E | coordinates_ts = <!-- {{Coord|42.07|N|63.29|W|display=inline}} --><!--Geographic coordinates-->
62°39′29″ display=inline}} --><!--Geographic coordinates-->
| paleocoordinates_ts = <!-- {{Coord||N||W|display=inline}} --><!--Paleocoordinates--> | paleocoordinates_ts = <!-- {{Coord||N||W|display=inline}} --><!--Paleocoordinates-->
| region_ts = <!--]--> | region_ts = <!--Region of type section-->
| country_ts = <!-- ]--> | country_ts = <!-- ]-->
| thickness_ts = {{Cvt|30|m|ft}} | thickness_ts = <!--Thickness at type section-->
}} }} }}


The Aitym formation is a Geological formation in Uzbekistan which possibly dates to the Santonian stage of the Late Cretaceous period.<ref name=":0">{{Cite journal |last=Averianov |first=A |date=2003 |title=Mammals from the Upper Cretaceous Aitym Formation, Kyzylkum Desert, Uzbekistan |url=https://linkinghub.elsevier.com/retrieve/pii/S0195667103000375 |journal=Cretaceous Research |language=en |volume=24 |issue=2 |pages=171–191 |doi=10.1016/S0195-6671(03)00037-5}}</ref> The '''Aitym Formation''' is a ] in Uzbekistan which possibly dates to the ] stage of the ] period.<ref name=":0">{{Cite journal |last=Averianov |first=A |date=2003 |title=Mammals from the Upper Cretaceous Aitym Formation, Kyzylkum Desert, Uzbekistan |url=https://linkinghub.elsevier.com/retrieve/pii/S0195667103000375 |journal=Cretaceous Research |language=en |volume=24 |issue=2 |pages=171–191 |doi=10.1016/S0195-6671(03)00037-5|bibcode=2003CrRes..24..171A }}</ref>


The formation has not been precisely dated. However, certain ] suggest the formation was deposited during the Santonian stage of the Late Cretaceous period.<ref name=":0" />
⚫ == Fossil Content ==

⚫ == Fossil content ==
A diverse fauna has been unearthed from the Aitym Formation including ], ] and many ] ]s, including an abundant assemblage of ] (cartilaginous fish), a rarer assemblage of ] (bony fish), and rather infrequent finds of ], and ]. ] vertebrate remains are extremely rare in the formation. A few bones of ], ], ], possibly terrestrial ] remains, ] (including ]), and ] have been found in the formation.<ref name=":0" />
{{Paleobiota-key-compact}}
{| class="wikitable" align="center" {| class="wikitable" align="center"
|- |-
! colspan="5" align="center" | '''] of the Aitym Formation''' ! colspan="5" align="center" | ''']s of the Aitym Formation'''
|- |-
! Genus !! Species !! Location !! Notes!! Images ! Genus !! Species !! Location !! Notes!! Images
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|''U. wardi''<ref name=":0" /> |''U. wardi''<ref name=":0" />
| |
|A ]] |A ]n ]
| |
|- |-
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|cf. ''S.'' sp.<ref name=":0" /> |cf. ''S.'' sp.<ref name=":0" />
| |
|A ] ] |A ] ]
| |
|- |-
|'']'' |style="background:#f3e9f3;"|'']''
|Cf. ''D.'' sp.<ref name=":0" /> |style="background:#fbdddb;"|cf. ''D.'' sp.<ref name=":0" />
|style="background:#fbdddb;" |
⚫ |
|A ] |style="background:#fbdddb;" |A ]; reclassified later as '']'', as the two genera have been synonymized
|style="background:#fbdddb;" |
⚫ |
|- |-
|'']'' |'']''
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|''Paranyctoides'' sp. cf. ''P. aralensis''<ref name=":0" /> |''Paranyctoides'' sp. cf. ''P. aralensis''<ref name=":0" />
| |
| rowspan="2" |A Possible ] | rowspan="2" |A possible ]
| |
|- |-
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|} |}



⚫ == References ==
{| class="wikitable" align="center"
|-
! colspan="5" align="center" | ''']s of the Aitym Formation'''
|-
! Genus !! Species !! Location !! Notes!! Images
|-
| '']''
| ''P. kyzylkumense''<ref name=":0" />

⚫ |
|A ] ]
⚫ |
⚫ |}
{| class="wikitable" align="center"
|-
! colspan="5" align="center" | ''']s of the Aitym Formation'''
|-
! Genus !! Species !! Location !! Notes!! Images
|-
|'']''
|''E. asiaticum''<ref>{{Cite journal |last1=Skutschas |first1=Pavel P. |last2=Saburov |first2=Pavel G. |last3=Boitsova |first3=Elizaveta A. |last4=Kolchanov |first4=Veniamin V. |date=2019 |title=Ontogenetic changes in long-bone histology of the cryptobranchid Eoscapherpeton asiaticum (Amphibia: Caudata) from the Late Cretaceous of Uzbekistan |url=http://cr-palevol.fr/18/30 |journal=Comptes Rendus Palevol |language=en |volume=18 |issue=3 |pages=306–316 |doi=10.1016/j.crpv.2019.02.002|bibcode=2019CRPal..18..306S }}</ref>
|
|A ]
|
|}

⚫ ==References==
{{reflist}}


] ]

Latest revision as of 19:59, 4 January 2025

Geological formation in Uzbekistan
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Aitym Formation
Stratigraphic range: ?Santonian
~86–83 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
TypeGeological formation
OverliesBissekty Formation
AreaKyzylkum Desert
Thicknessup to
Location
Aitym Formation is located in UzbekistanAitym FormationAitym Formation (Uzbekistan)

The Aitym Formation is a geological formation in Uzbekistan which possibly dates to the Santonian stage of the Late Cretaceous period.

The formation has not been precisely dated. However, certain fossils suggest the formation was deposited during the Santonian stage of the Late Cretaceous period.

Fossil content

A diverse fauna has been unearthed from the Aitym Formation including oysters, ammonites and many marine vertebrates, including an abundant assemblage of chondrichthyans (cartilaginous fish), a rarer assemblage of osteichthyans (bony fish), and rather infrequent finds of plesiosaurs, and sea turtles. Terrestrial vertebrate remains are extremely rare in the formation. A few bones of salamanders, lizards, crocodiles, possibly terrestrial turtle remains, dinosaurs (including birds), and mammals have been found in the formation.

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Mammals of the Aitym Formation
Genus Species Location Notes Images
Uzbekbaatar U. wardi A cimolodontan multituberculate
Shalbaatar cf. S. sp. A spalacotheriid symmetrodont
Deltatherus cf. D. sp. A deltatheroidan; reclassified later as Sulestes, as the two genera have been synonymized
Daulestes aff. D. sp A asioryctithere
Kulbeckia Kulbeckia sp. cf. K. kulbecke A possible zalambdalestid
aff. Kulbeckia sp.
Paranyctoides Paranyctoides sp. cf. P. aralensis A possible lipotyphlan
Paranyctoides sp.
Eoungulatum E. sp. cf. E. kudukensis Zhelestid ungulatomorphs
Parazhelestes P. sp. cf. P. robustus
P. sp. aff. P. minor
Aspanlestes cf. A. sp.


Molluscs of the Aitym Formation
Genus Species Location Notes Images
Placenticeras P. kyzylkumense A placenticeratid ammonite
Amphibians of the Aitym Formation
Genus Species Location Notes Images
Eoscapherpeton E. asiaticum A giant salamander

References

  1. ^ Averianov, A (2003). "Mammals from the Upper Cretaceous Aitym Formation, Kyzylkum Desert, Uzbekistan". Cretaceous Research. 24 (2): 171–191. Bibcode:2003CrRes..24..171A. doi:10.1016/S0195-6671(03)00037-5.
  2. Skutschas, Pavel P.; Saburov, Pavel G.; Boitsova, Elizaveta A.; Kolchanov, Veniamin V. (2019). "Ontogenetic changes in long-bone histology of the cryptobranchid Eoscapherpeton asiaticum (Amphibia: Caudata) from the Late Cretaceous of Uzbekistan". Comptes Rendus Palevol. 18 (3): 306–316. Bibcode:2019CRPal..18..306S. doi:10.1016/j.crpv.2019.02.002.
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