Ulan Malgait Formation
{{Short description|Geologic formation in Govi-Altai, Mongolia}}
{{Infobox rockunit
| name = Ulan Malgait Formation
| image =
| caption =
| type = Geological formation
| age = Tithonian or Oxfordian
~{{fossilrange|160|145}}
| period = Late Jurassic
| prilithology = Mudstone
| otherlithology = Sandstone, conglomerate, caliche
| namedfor = Ulan Malgait Mountain
| namedby =
| region = Govi-Altay
| country = {{Flag|Mongolia}}
| coordinates = {{coord|44.1|N|95.8|E|display=inline,title}}
| paleocoordinates = {{coord|46.0|N|98.0|E|display=inline}}
| unitof =
| subunits = Shar Teg & Ulan Malgait Beds
| underlies =
| overlies =
| thickness = up to ~{{convert|300|m|ft|abbr=on}}
| extent =
| area =
| map = {{Location map+ | Mongolia
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | Mongolia
| lat_deg = 44.1
| lon_deg = 95.8
| mark = Cyan pog.svg
| marksize = 10
}}
}}
| map_caption =
}}
The Ulan Malgait Formation is a Late Jurassic geologic formation in Mongolia. Dinosaur remains are among the fossils that have been recovered from the formation, although {{as of|2004|lc=y}} none have yet been referred to a specific genus.Weishampel et al., 2004, pp.517-607
It is best known for the Shar Teeg locality which has lent its name to Shartegosuchidae, a family of mesoeucrocodylians (relatives of crocodilians), many of which have been found there; Shartegosuchus (the family's type genus) means "Shar Teeg crocodile".Dollman et al., 2018 It is divided up into 2 subunits, the lower Shar Teg Beds and the upper Ulan Malgait Beds.Watabe, 2010
The tritylodontids Shartegodon, Nuurtherium and Bienotheroides are known from the formation.,Velazco et al., 2017 As is docodontan Tegotherium. The turtles Annemys levensis and Annemys latiens and crocodylians Sunosuchus shartegensis and Adzhosuchus fuscus were also recovered from the formation.Efimov et al., 2000 Numerous species of insects are also known from the formation.I. D. Sukacheva. 2000. New fossil caddis flies (Trichoptera) from the Shar-Teg locality in Mongolia. Paleontological Journal 34(Suppl 3):S347-S351{{Cite web|title=Shar-Teg, outcrop 443/1 (PIN collection 4270)|url=https://paleobiodb.org/classic/displayCollResults?collection_no=104748|website=Paleobiology Database|via=fossilworks}}{{Cite web|title=Shar-Teg, outcrop 423/6 (PIN collection 4270)|url=https://paleobiodb.org/classic/displayCollResults?collection_no=121394|website=Paleobiology Database|via=fossilworks}}{{Cite web|title=Shar-Teg, outcrop 441/4 (PIN collection 4270)|url=https://paleobiodb.org/classic/displayCollResults?collection_no=152133|website=Paleobiology Database|via=fossilworks}} which was deposited in a lacustrine environment.
Age
Dollman et al. (2018) argue that the age of the Ulan Malgait Formation is likely to be Oxfordian based on the shared presence of Shartegosuchus and Nominosuchus with the radiometrically-dated Shishigou Formation of China.[https://paleobiodb.org/classic/displayCollResults?collection_no=69913 Bor Ukhaa hills] at Fossilworks.org
See also
References
{{Reflist|3}}
= Bibliography =
- {{cite journal |last1=Dollman |first1=K. N. |first2=J. M. |last2=Clark |first3=M. A. |last3=Norell |first4=X. |last4=Xu |first5=J. M. |last5=Choiniere |year=2018 |title=Convergent Evolution of a Eusuchian-Type Secondary Palate within Shartegosuchidae |journal=American Museum Novitates |issue=3901 |pages=1–23|doi=10.1206/3901.1 }}
- {{cite journal |first1=Paúl M. |last1=Velazco |first2=Alexandra J. |last2=Buczek |first3=Michael J. |last3=Novacek |year=2017 |title=Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia |journal=American Museum Novitates |issue=3874 |pages=1–35| doi=10.1206/3874.1| hdl=2246/6698|hdl-access=free }}
- {{cite journal |last=Watabe |first=Mahito |year=2010 |title=Geology of dinosaur-fossil-bearing localities (Jurassic and Cretaceous: Mesozoic) in the Gobi Desert: Results of the HMNS-MPC Joint Paleontological Expedition |url=https://www.academia.edu/3119116 |journal=Hayashibara Museum of Natural Sciences Research Bulletin |publisher=Hayashibara Museum of Natural Sciences |volume=3 |pages=41–118}}
- {{cite book |editor-last=Weishampel |editor-first=David B. |editor-last2=Dodson |editor-first2=Peter |editor-last3=Osmólska |editor-first3=Halszka |year=2004 |title=The Dinosauria|edition=2nd |url=https://books.google.com/books?id=vtZFDb_iw40C |location=Berkeley|publisher= University of California Press |pages=1–880 |accessdate=2019-02-21|isbn=0-520-24209-2}}
- {{cite journal |last1=Efimov |first1=M. B. |first2=Y. M. |last2=Gubin |first3=S. M. |last3=Kurzanov |year=2000 |title=New primitive crocodile (Crocodylomorpha: Shartegosuchidae) from the Jurassic of Mongolia |journal=Paleontological Journal |volume=34 |pages=S238–S241}}
Further reading
- M. Rabi, V. B. Sukhanov, V. N. Egorova, I. Danilov, and W. G. Joyce. 2014. Osteology, relationships, and ecology of Annemys (Testudines, Eucryptodira) from the Late Jurassic of Shar Teg, Mongolia, and phylogenetic definitions for Xinjiangchelyidae, Sinemydidae, and Macrobaenidae. Journal of Vertebrate Paleontology 34(2):327-352
- M. Watabe, K. Tsogtbaatar, T. Tsuihiji and R. Barsbold. 2003. The first discovery of diverse Jurassic dinosaur faunas in Mongolia. Journal of Vertebrate Paleontology 23(3, suppl.):108A
- V. B. Sukhanov. 2000. Mesozoic turtles of Middle and Central Asia. In M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin (eds.), The Age of Dinosaurs in Russia and Mongolia 309-367
- Y. M. Gubin and S. M. Sinitza. 1996. Shar Teg: a unique Mesozoic locality of Asia. In M. Morales (ed.), The Continental Jurassic. Museum of Northern Arizona Bulletin 60:311-318
Category:Geologic formations of Mongolia
Category:Jurassic System of Asia