Barun Goyot Formation

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Barun Goyot Formation
Stratigraphic range: Maastrichtian
~72–71 Ma
Type Geological formation
Underlies Nemegt Formation
Overlies Djadokhta Formation
Thickness ca. 110 m (360 ft)
Lithology
Primary Sandstone
Location
Region Gobi Desert
Country  Mongolia

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.

Description

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

Saurischians

Genus Species Location Material Notes Images

Heyuannia

H. yanshini

  • Hermin Tsav[2]

An oviraptorid originally called Ajancingenia

Avimimus

Indeterminate

An avimimid similar to Avimimus portentosus from the Nemegt Formation

Ceratonykus

C. oculatus

  • Hermin Tsav

An alvarezsaurid.

Gobipteryx

G. minuta

"Embryonic skulls and skeletons."[3]

An enantiornithine.

Hollanda

H. luceria

An ornithuromorph

Hulsanpes

H. perlei

"Partial foot."[4]

A halszkaraptorine dromaeosaurid.

?Mononykus

Indeterminate

An alvarezsaurid

Oviraptorinae indet.[2]

Indeterminate

An oviraptorid

Parvicursor

P. remotus

"Partial postcranial skeleton."[5]

An alvarezsaurid

Sauropoda indet.

Indeterminate

Tarbosaurus?[6]

T. bataar?[6]

A tyrannosaurid; may actually be from the Nemegt Formation.[6]

Velociraptorinae indet.[2]

Indeterminate

A dromaeosaurid.

Lizards

Genus Species Location Stratigraphic position Abundance Notes Images

Estesia

Estesia mongoliensis

An anguimorph

Ovoo

Ovoo gurvel

A Monitor lizard

Proplatynotia

Proplatynotia longirostrata

Gobiderma

Gobiderma pulchrum

A Monstersaur

Mammals

Genus Species Location Stratigraphic position Abundance Notes Images

Asiatherium

Asiatherium reshetovi

A metatherian.

Asioryctes

Asioryctes nemegetensis

An eutherian.

Barunlestes

Barunlestes butleri

A eutherian

Catopsbaatar

Catopsbaatar catopsaloides

A multituberculate

Chulsanbaatar

Chulsanbaatar vulgaris

A multituberculate

Deltatheridium

Deltatheridium pretrituberculare

A metatherian

Nemegtbaatar

Nemegtbaatar gobiensis

A multituberculate

Zofialestes

Z. longidens

A eutherian related to Zalambdalestes

Ornithischians

Genus Species Location Material Notes Images

Bagaceratops

B. rozhdestvenskyi

"[Five] complete skulls, [twenty] fragmentary skulls, postcranial skeletons, juvenile to adult."[7]

A ceratopsian.

Breviceratops

Breviceratops kozlowskii

A ceratopsian.

Lamaceratops

Lamaceratops tereschenkoi

A ceratopsian.

Platyceratops

Platyceratops tatarinovi

A ceratopsian.

Saichania

S. chulsanensis

"."[8]

An ankylosaur.

Tarchia

T. kielanae

An ankylosaur.

Tylocephale

T. gilmorei

A pachycephalosaur.

Zaraapelta[9]

Z. nomadis

  • Hermiin Tsav[9]

An ankylosaur.

Eggs

Oogenus Oospecies Location Material Notes

Styloolithus[10]

S. sabathi

Probably avian

Faveoloolithus[11]

F. ningxiaensis

Possibly sauropod eggs

See also

References

  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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