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Barun Goyot Formation
Stratigraphic range: Late Cretaceous approximately 71 million years old.
Type Geological formation
Thickness over 100 meters
Location
Region Asia
Country 23x15px 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.

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 doesn't 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 110m 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

Ajancingenia

A. yanshini

  • Hermin Tsav[2]

An oviraptorid

Avimimus

Indeterminate

An avimimid similar to Avimimus portentosus from the Nemegt Formation.

Ceratonykus

C. oculatus

  • Hermin Tsav

An alvarezsaurid

Conchoraptor

C. gracilis

  • Hermin Tsav[2]

An oviraptorid

Gobipteryx

G. minuta

"Embryonic skulls and skeletons."[3]

An enantiornithine

Hollanda

H. luceria

An ornithuromorph

Hulsanpes

H. perlei

"Partial foot."[4]

A maniraptoran of uncertain classification

?Mononykus

Indeterminate

An alvarezsaurid.

Oviraptorinae indet.[2]

Indeterminate

An oviraptorid.

Parvicursor

P. remotus

"Partial postcranial skeleton."[5]

An alvarezsaurid

Sauropoda indet.

Indeterminate

A sauropod.

Tarbosaurus?</small>[6]

T. bataar?</small>[6]

A tyrannosaurid, may actually be from the Nemegt Formation.</small>[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 marsupial.

Asioryctes

Asioryctes nemegetensis

A placental.

Barunlestes

Barunlestes butleri

A placental.

Catopsbaatar

Catopsbaatar catopsaloides

A multituberculate.

Chulsanbaatar

Chulsanbaatar vulgaris

A multituberculate.

Deltatheridium

Deltatheridium pretrituberculare

A marsupial.

Nemegtbaatar

Nemegtbaatar gobiensis

A multituberculate.

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

Script error

Oogenus Oospecies Location Material Notes

Styloolithus[10]

S. sabathi

Probably avian

Faveoloolithus[11]

F. ningxiaensis

Possibly sauropod eggs.

See also

Script error

References

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