Barun Goyot Formation

The Barun Goyot Formation or Baruun 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 PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Nemegt Formation
Overlies	Djadokhta Formation
Thickness	ca. 110 m (360 ft)
Lithology
Primary	Sandstone
Location
Coordinates	43.5°N 99.8°E / 43.5; 99.8
Approximate paleocoordinates	40.5°N 89.5°E / 40.5; 89.5
Region	Omnogov
Country	Mongolia
Extent	Gobi Desert
Barun Goyot Formation (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	Heyuannia yanshini
Avimimus	Indeterminate	Khulsan[2]		An avimimid similar to Avimimus portentosus from the Nemegt Formation	Avimimus
Ceratonykus	C. oculatus	Hermin Tsav		An alvarezsaurid.	Ceratonykus
Gobipteryx	G. minuta		"Embryonic skulls and skeletons."[3]	An enantiornithine.
Hollanda	H. luceria			An ornithuromorph	Hollanda
Hulsanpes	H. perlei		"Partial foot."[4]	A halszkaraptorine dromaeosaurid.
?Mononykus	Indeterminate	Khulsan[2]		An alvarezsaurid	Mononykus
Oviraptorinae indet.[2]	Indeterminate	Khulsan[2]		An oviraptorid
Parvicursor	P. remotus	Khulsan[2]	"Partial postcranial skeleton."[5]	An alvarezsaurid
Sauropoda indet.	Indeterminate	Khulsan[2]
Tarbosaurus?[6]	T. bataar?[6]			A tyrannosaurid; may actually be from the Nemegt Formation.[6]
Velociraptorinae indet.[2]	Indeterminate	Hermin Tsav[2] Khulsan[2]		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				A eutherian.
Barunlestes	Barunlestes butleri				A eutherian
Catopsbaatar	Catopsbaatar catopsaloides				A multituberculate	Catopsbaatar
Chulsanbaatar	Chulsanbaatar vulgaris				A multituberculate
Deltatheridium	Deltatheridium pretrituberculare				A metatherian
Nemegtbaatar	Nemegtbaatar gobiensis				A multituberculate	Nemegtbaatar
Zofialestes	Z. longidens				A eutherian related to Zalambdalestes

Ornithischians

Genus	Species	Location	Material	Notes	Images
Bagaceratops	B. rozhdestvenskyi	Hermin Tsav[2] Khulsan[2]	"[Five] complete skulls, [twenty] fragmentary skulls, postcranial skeletons, juvenile to adult."[7]	A ceratopsian.	Bagaceratops Breviceratops Saichania Tarchia Tylocephale
Breviceratops	Breviceratops kozlowskii			A ceratopsian.
Lamaceratops	Lamaceratops tereschenkoi			A ceratopsian.
Platyceratops	Platyceratops tatarinovi			A ceratopsian.
Saichania	S. chulsanensis	Hermin Tsav[2] Khulsan[2]	"."[8]	An ankylosaur.
Tarchia	T. kielanae	Khulsan[2]		An ankylosaur.
Tylocephale	T. gilmorei	Khulsan[2]		A pachycephalosaur.
Zaraapelta[9]	Z. nomadis	Hermiin Tsav[9]		An ankylosaur.

Eggs

Oogenus	Oospecies	Location	Material	Notes
Styloolithus[10]	S. sabathi	Khulsan[10]		Probably avian
Faveoloolithus[11]	F. ningxiaensis	Ikh-Shunkht[11]		Possibly sauropod eggs

See also

• List of dinosaur-bearing rock formations
• List of fossil sites (with link directory)

References

1. Gradzinski, R.; & Jerzykiewicz, T. (1974). Sedimentation of the Barun Goyot formation. Palaeontologica Polonica, 30, 111-146.
2. 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. 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. 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. 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. 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.