# Ulan Malgait Formation

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Geologic formation in Govi-Altai, Mongolia

Ulan Malgait Formation Stratigraphic range: Tithonian or Oxfordian ~160–145 Ma PreꞒ Ꞓ O S D C P T J K Pg N Type Geological formation Sub-units Shar Teg & Ulan Malgait Beds Thickness up to ~300 m (980 ft) Lithology Primary Mudstone Other Sandstone, conglomerate, caliche Location Coordinates 44°06′N 95°48′E / 44.1°N 95.8°E / 44.1; 95.8 Approximate paleocoordinates 46°00′N 98°00′E / 46.0°N 98.0°E / 46.0; 98.0 Region Govi-Altay Country Mongolia Type section Named for Ulan Malgait Mountain Ulan Malgait Formation (Mongolia)

The **Ulan Malgait Formation** is a [Late Jurassic](/source/Late_Jurassic) geologic [formation](/source/Formation_(geology)) in [Mongolia](/source/Mongolia). [Dinosaur](/source/Dinosaur) remains are among the fossils that have been recovered from the formation, although as of 2004[\[update\]](https://en.wikipedia.org/w/index.php?title=Ulan_Malgait_Formation&action=edit) none have yet been referred to a specific [genus](/source/Genus).[1]

It is best known for the **Shar Teeg** locality which has lent its name to [Shartegosuchidae](/source/Shartegosuchidae), a [family](/source/Family_(taxonomy)) of [mesoeucrocodylians](/source/Mesoeucrocodylia) (relatives of crocodilians), many of which have been found there; *[Shartegosuchus](/source/Shartegosuchus)* (the family's [type genus](/source/Type_genus)) means "Shar Teeg crocodile".[2] It is divided up into 2 subunits, the lower **Shar Teg Beds** and the upper **Ulan Malgait Beds**.[3]

The [tritylodontids](/source/Tritylodontidae) *[Shartegodon](/source/Shartegodon), [Nuurtherium](/source/Nuurtherium)* and *[Bienotheroides](/source/Bienotheroides)* are known from the formation.,[4] As is [docodontan](/source/Docodonta) *[Tegotherium](/source/Tegotherium)*. The turtles *[Annemys levensis](https://en.wikipedia.org/w/index.php?title=Annemys&action=edit&redlink=1)* and *[Annemys latiens](https://en.wikipedia.org/w/index.php?title=Annemys&action=edit&redlink=1)* and crocodylians *[Sunosuchus shartegensis](/source/Sunosuchus)* and *[Adzhosuchus fuscus](/source/Adzhosuchus)* were also recovered from the formation.[5] Numerous species of insects are also known from the formation.[6][7][8][9] which was deposited in a [lacustrine](/source/Lacustrine) [environment](/source/Depositional_environment).

## Age

Dollman et al. (2018) argue that the age of the Ulan Malgait Formation is likely to be [Oxfordian](/source/Oxfordian_stage) based on the shared presence of *[Shartegosuchus](/source/Shartegosuchus)* and *[Nominosuchus](/source/Nominosuchus)* with the radiometrically dated [Shishigou Formation](/source/Shishugou_Formation) of China.[10]

## See also

- [List of dinosaur-bearing rock formations](/source/List_of_dinosaur-bearing_rock_formations) - [List of stratigraphic units with indeterminate dinosaur fossils](/source/List_of_stratigraphic_units_with_indeterminate_dinosaur_fossils)

## References

1. **[^](#cite_ref-dinosaurdistribution_1-0)** Weishampel et al., 2004, pp.517-607

1. **[^](#cite_ref-Dollman2018_2-0)** Dollman et al., 2018

1. **[^](#cite_ref-Watabe2010_3-0)** Watabe, 2010

1. **[^](#cite_ref-Velazco2017_4-0)** Velazco et al., 2017

1. **[^](#cite_ref-Efimov2000_5-0)** Efimov et al., 2000

1. **[^](#cite_ref-6)** I. D. Sukacheva. 2000. New fossil caddis flies (Trichoptera) from the Shar-Teg locality in Mongolia. *Paleontological Journal* **34(Suppl 3)**:S347-S351

1. **[^](#cite_ref-7)** ["Shar-Teg, outcrop 443/1 (PIN collection 4270)"](https://paleobiodb.org/classic/displayCollResults?collection_no=104748). *Paleobiology Database* – via fossilworks.

1. **[^](#cite_ref-8)** ["Shar-Teg, outcrop 423/6 (PIN collection 4270)"](https://paleobiodb.org/classic/displayCollResults?collection_no=121394). *Paleobiology Database* – via fossilworks.

1. **[^](#cite_ref-9)** ["Shar-Teg, outcrop 441/4 (PIN collection 4270)"](https://paleobiodb.org/classic/displayCollResults?collection_no=152133). *Paleobiology Database* – via fossilworks.

1. **[^](#cite_ref-FWBorUkhaaHills_10-0)** [Bor Ukhaa hills](https://paleobiodb.org/classic/displayCollResults?collection_no=69913) at [Fossilworks](/source/Fossilworks).org

### Bibliography

- Dollman, K. N.; Clark, J. M.; Norell, M. A.; Xu, X.; Choiniere, J. M. (2018). "Convergent Evolution of a Eusuchian-Type Secondary Palate within Shartegosuchidae". *[American Museum Novitates](/source/American_Museum_Novitates)* (3901): 1–23. [doi](/source/Doi_(identifier)):[10.1206/3901.1](https://doi.org/10.1206%2F3901.1).

- Velazco, Paúl M.; Buczek, Alexandra J.; Novacek, Michael J. (2017). "Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia". *[American Museum Novitates](/source/American_Museum_Novitates)* (3874): 1–35. [doi](/source/Doi_(identifier)):[10.1206/3874.1](https://doi.org/10.1206%2F3874.1). [hdl](/source/Hdl_(identifier)):[2246/6698](https://hdl.handle.net/2246%2F6698).

- Watabe, Mahito (2010). ["Geology of dinosaur-fossil-bearing localities (Jurassic and Cretaceous: Mesozoic) in the Gobi Desert: Results of the HMNS-MPC Joint Paleontological Expedition"](https://www.academia.edu/3119116). *[Hayashibara Museum of Natural Sciences Research Bulletin](https://en.wikipedia.org/w/index.php?title=Hayashibara_Museum_of_Natural_Sciences_Research_Bulletin&action=edit&redlink=1)*. **3**. Hayashibara Museum of Natural Sciences: 41–118.

- [Weishampel](/source/David_B._Weishampel), David B.; [Dodson](/source/Peter_Dodson), Peter; [Osmólska](/source/Halszka_Osm%C3%B3lska), Halszka, eds. (2004). [*The Dinosauria*](https://books.google.com/books?id=vtZFDb_iw40C) (2nd ed.). Berkeley: University of California Press. pp. 1–880. [ISBN](/source/ISBN_(identifier)) [0-520-24209-2](https://en.wikipedia.org/wiki/Special:BookSources/0-520-24209-2). Retrieved 2019-02-21.

- Efimov, M. B.; Gubin, Y. M.; Kurzanov, S. M. (2000). "New primitive crocodile (Crocodylomorpha: Shartegosuchidae) from the Jurassic of Mongolia". *[Paleontological Journal](/source/Paleontological_Journal)*. **34**: 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

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