# Dushihin Formation

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{{short description|Early Cretaceous geologic formation in Mongolia}}
{{Infobox rockunit
| name           = Dushihin Formation
| image          =
| caption        =
| type           = [Geological formation](/source/Geological_formation)
| age            = [Aptian](/source/Aptian)<br>{{fossil range|125|113}}
| period         = Aptian
| prilithology   = [Claystone](/source/Claystone), [conglomerate](/source/conglomerate_(geology))
| otherlithology = 
| namedfor       = 
| namedby        = 
| region         = [Övörkhangai Province](/source/%C3%96v%C3%B6rkhangai_Province)
| country        = [Mongolia](/source/Mongolia)
| coordinates    = {{coord|45.4|N|101.7|E|display=inline,title}}
| paleocoordinates = {{coord|46.5|N|101.7|E|display=inline}}
| unitof         = 
| subunits       = 
| underlies      = 
| overlies       = 
| thickness      = 
| extent         = 
| area           = 
| map            = {{Location map+ | Mongolia
| relief = 1
| width   = 250
| float   = center
| places  =
  {{Location map~ | Mongolia
  | lat_deg = 45.4
  | lon_deg = 101.7
  | mark = Green pog.svg
  | marksize = 10
  }}
}}
| map_caption    =
}}
The '''Dushihin Formation''' is an [Early Cretaceous](/source/Early_Cretaceous) ([Aptian](/source/Aptian)) geologic [formation](/source/Formation_(geology)) in the [Övörkhangai Province](/source/%C3%96v%C3%B6rkhangai_Province) of Mongolia.<ref name=PBDB>[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Dushihin&group_formation_member=Dushihin Dushihin Formation] in the [Paleobiology Database](/source/Paleobiology_Database)</ref> The formation preserves fossils of ''[Psittacosaurus mongoliensis](/source/Psittacosaurus)'' and [fossil egg](/source/fossil_egg)s described as ''[Trachoolithus faticanus](/source/Trachoolithus)''.

== Description ==
The formation comprises concretionary, calcareous claystones and concretionary, brown, gray, green, blue, calcareous claystones with large flattened lime concretions. Within {{convert|3|m|ft}} in the formation is a lens of lighter grayish-brown clay with green and blue spots and small lime concretions. In the lens is also an inclusion of blue, pale purple-spotted [aleurite](/source/aleurite). The [depositional environment](/source/depositional_environment) has been interpreted as [lacustrine](/source/lacustrine).<ref name=Builjasutuin>[https://paleobiodb.org/classic/basicCollectionSearch?collection_no=52127 Builjasutuin-Khuduk] in the [Paleobiology Database](/source/Paleobiology_Database)</ref>

== Fossil content ==
The following fossils were reported from the [lacustrine](/source/lacustrine) [claystone](/source/claystone)s and [conglomerates](/source/conglomerate_(geology)) of the formation:<ref name=PBDB/>
* [Dinosaur](/source/Dinosaur)s
** ''[Psittacosaurus mongoliensis](/source/Psittacosaurus)''<ref name=Shuvalov1975>Shuvalov, 1975</ref>
** [Sauropoda indet.](/source/Sauropoda)<ref name=Kurzanov1989/>
** [Theropoda indet.](/source/Theropoda)<ref name=Kurzanov1989/>
* [Fossil egg](/source/Fossil_egg)s
** ''[Trachoolithus faticanus](/source/Trachoolithus)''<ref name=Mikhailov2000>Mikhailov, 2000</ref>
** [Elongatoolithidae indet.](/source/Elongatoolithidae)<ref name=Mikhailov1994>Mikhailov et al., 1994</ref>
** [Spheroolithidae indet.](/source/Spheroolithidae)<ref name=Mikhailov1994/>
* [Squamata](/source/Squamata)
** [Paramacellodidae indet.](/source/Paramacellodidae)<ref name=Kurzanov1989>Kurzanov & Mikhailov, 1989</ref>

== See also ==
{{div col|colwidth=24em}}
* [List of dinosaur-bearing rock formations](/source/List_of_dinosaur-bearing_rock_formations)
** [List of stratigraphic units with dinosaur eggs](/source/List_of_stratigraphic_units_with_dinosaur_trace_fossils)
* [Andaikhudag Formation](/source/Andaikhudag_Formation)
* [Khuren Dukh Formation](/source/Khuren_Dukh_Formation)
* [Tsagaantsav Formation](/source/Tsagaantsav_Formation)
{{div col end}}

== References ==
{{Reflist|3}}

=== Bibliography ===
<!--most recent first-->
* {{citation |last=Mikhailov |first=K.E |year=2000 |title=Eggs and eggshells of dinosaurs and birds from the Cretaceous of Mongolia. In M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin |publisher=The Age of Dinosaurs in Russia and Mongolia |pages=560–572}}
* {{citation |last1=Mikhailov |first1=K. |first2=K. |last2=Sabath |first3=S. |last3=Kurzanov |year=1994 |title=Eggs and nests from the Cretaceous of Mongolia. In K. Carpenter, K. F. Hirsch, and J. R. Horner (eds.), Dinosaur Eggs and Babies |publisher=[Cambridge University](/source/Cambridge_University) Press, Cambridge |pages=88–115}}
* {{citation |last1=Kurzanov |first1=S.M. |first2=K.E. |last2=Mikhailov |year=1989 |title=Dinosaur eggshells from the Lower Cretaceous of Mongolia |publisher=D. D. Gillette and M. G. Lockley (eds.), Dinosaur Tracks and Traces. Cambridge University Press, Cambridge |pages=109–113}}
* {{citation |last=Shuvalov |first=V.F |year=1975 |title=Novoe Mestonakhozhdenie rannemelovykh dinozavrov Buylyasutuin-Khuduk - A new locality of Early Cretaceous dinosaurs, Buylyasutuin-Khuduk - in N. Kramarenko, B. Luwsandansan, Yu. Voronin, R. Barsbold, A. Rozhdestvensky (eds.), Iskopaemaya Fauna I Flora Mongolii [Fossil Flora and Fauna of Mongolia] |journal=Sovmestnaya Sovetsko-Mongol'skaya Paleontologicheskaya Ekspeditsiya, Trudy - the Joint Soviet-Mongolian Paleontological Expedition, Transactions |volume=2 |pages=210–213}}

Category:Geologic formations of Mongolia
Category:Lower Cretaceous Series of Asia
Category:Cretaceous Mongolia
Category:Aptian Stage
Category:Conglomerate formations
Category:Shale formations
Category:Lacustrine deposits
Category:Ooliferous formations
Category:Paleontology in Mongolia
Formations

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Adapted from the Wikipedia article [Dushihin Formation](https://en.wikipedia.org/wiki/Dushihin_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Dushihin_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.