Barun Goyot Formation

The Barun Goyot Formation (West Goyot Formation) is a geological formation dating to the Late Cretaceous Period. It is located within and is widely represented in the Gobi Desert Basin, in the Ömnögovi Province of Mongolia.

Barun Goyot Formation
Stratigraphic range: Maastrichtian
~72–71 Ma
TypeGeological formation
UnderliesNemegt Formation
OverliesDjadokhta Formation
Thicknessca. 110 m (360 ft)
RegionGobi Desert
Country Mongolia


It was previously known as the "Lower Nemegt Beds" occurring beneath the Nemegt Formation and above the Djadokhta Formation. It has been suggested that the Djadokhta and Barun Goyot Formations are lower and upper parts, respectively, of the same lithological unit and the boundary between the two does not exist. The stratotype of the Barun Goyot Formation is the Khulsan locality, east of Nemegt. At Nemegt, only the uppermost barungoyotian beds are visible. The Red Beds of Khermeen Tsav are also considered part of the Barun Goyot Formation. It is approximately 110 metres (360 ft) in thickness,[1] and was laid down roughly 72-71 million years ago. Given the new date for the start of the Maastrichtian (72.1 MYA) a basal Maastrichtian age seems probable. The Barun Goyot Formation preserves an environment of sand dunes, created from wind-eroded rocks (aeolian dunes).

Vertebrate paleofauna



Genus Species Location Stratigraphic position Abundance Notes Images


Estesia mongoliensis

An anguimorph


Ovoo gurvel

A Monitor lizard


Proplatynotia longirostrata


Gobiderma pulchrum

A Monstersaur




Oogenus Oospecies Location Material Notes


S. sabathi

Probably avian


F. ningxiaensis

Possibly sauropod eggs

See also


  1. ^ Gradzinski, R.; & Jerzykiewicz, T. (1974). Sedimentation of the Barun Goyot formation. Palaeontologica Polonica, 30, 111-146.
  2. ^ a b c d e f g h i j k l m n o p Nicholas R. Longrich; Philip J. Currie; Dong Zhi-Ming (2010). "A new oviraptorid (Dinosauria: Theropoda) from the Upper Cretaceous of Bayan Mandahu, Inner Mongolia". Palaeontology. 53 (5): 945–960. doi:10.1111/j.1475-4983.2010.00968.x.
  3. ^ "Table 11.1," in Weishampel, et al. (2004). Page 213.
  4. ^ "Table 10.1," in Weishampel, et al. (2004). Page 199.
  5. ^ "Table 11.1," in Weishampel, et al. (2004). Page 211.
  6. ^ a b c Mortimer, M (2004). "Tyrannosauroidea". The Theropod Database. Archived from the original on 2013-09-29. Retrieved 2007-08-21.
  7. ^ "Table 22.1," in Weishampel, et al. (2004). Page 479.
  8. ^ "Table 17.1," in Weishampel, et al. (2004). Page 364.
  9. ^ a b Arbour, V. M., Currie, P. J. and Badamgarav, D. (2014), "The ankylosaurid dinosaurs of the Upper Cretaceous Baruungoyot and Nemegt formations of Mongolia". Zoological Journal of the Linnean Society, 172: 631–652. doi: 10.1111/zoj.12185
  10. ^ a b Varricchio, D.J. and D.E. Barta (2015). "Revisiting Sabath's "Larger Avian Eggs" from the Gobi Cretaceous" Acta Palaeontologica Polonica 60(1):11-25.
  11. ^ a b K. Mikhailov, K. Sabath, and S. Kurzanov. 1994. Eggs and nests from the Cretaceous of Mongolia. In K. Carpenter, K. F. Hirsch, and J. R. Horner (eds.), Dinosaur Eggs and Babies, Cambridge University Press, Cambridge 88-115.

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