{{short description|Early Cretaceous geologic formation in Mongolia}} {{Infobox rockunit | name = Dushihin Formation | image = | caption = | type = Geological formation | age = Aptian<br>{{fossil range|125|113}} | period = Aptian | prilithology = Claystone, conglomerate | otherlithology = | namedfor = | namedby = | region = Övörkhangai Province | country = 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 (Aptian) geologic formation in the Övörkhangai 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</ref> The formation preserves fossils of ''Psittacosaurus mongoliensis'' and fossil eggs described as ''Trachoolithus faticanus''.
== 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. The depositional environment has been interpreted as lacustrine.<ref name=Builjasutuin>[https://paleobiodb.org/classic/basicCollectionSearch?collection_no=52127 Builjasutuin-Khuduk] in the Paleobiology Database</ref>
== Fossil content == The following fossils were reported from the lacustrine claystones and conglomerates of the formation:<ref name=PBDB/> * Dinosaurs ** ''Psittacosaurus mongoliensis''<ref name=Shuvalov1975>Shuvalov, 1975</ref> ** Sauropoda indet.<ref name=Kurzanov1989/> ** Theropoda indet.<ref name=Kurzanov1989/> * Fossil eggs ** ''Trachoolithus faticanus''<ref name=Mikhailov2000>Mikhailov, 2000</ref> ** Elongatoolithidae indet.<ref name=Mikhailov1994>Mikhailov et al., 1994</ref> ** Spheroolithidae indet.<ref name=Mikhailov1994/> * Squamata ** Paramacellodidae indet.<ref name=Kurzanov1989>Kurzanov & Mikhailov, 1989</ref>
== See also == {{div col|colwidth=24em}} * List of dinosaur-bearing rock formations ** List of stratigraphic units with dinosaur eggs * Andaikhudag Formation * Khuren Dukh Formation * 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 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