Barun Goyot Formation

The Barun Goyot Formation (also known as Baruungoyot 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, 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).

Paleobiota of the Barun Goyot Formation[]

Color key

Taxon

Reclassified taxon

Taxon falsely reported as present

Dubious taxon or junior synonym

Ichnotaxon

Ootaxon

Morphotaxon

NotesUncertain or tentative taxa are in small text; ~~crossed out~~taxa are discredited.

Lizards[]

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Genus	Species	Notes
Estesia	Estesia mongoliensis	An anguimorph
Gobiderma	Gobiderma pulchrum	A Monstersaur
Proplatynotia	Proplatynotia longirostrata

Mammals[]

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Genus	Species	Notes
Asioryctes	A. nemegtensis	An eutherian.
Barunlestes	B. butleri	An eutherian.
Catopsbaatar	C. catopsaloides	A djadochtatheriid.
Chulsanbaatar	C. vulgaris	A multituberculate.
Deltatheridium	D. pretrituberculare	A tribosphenid.
Nemegtbaatar	N. gobiensis	A multituberculate.
Zofialestes	Z. longidens	A eutherian.

Dinosaurs[]

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Ornithiscians[]

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Ankylosaurs[]

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Genus	Species	Location	Material	Notes
Saichania	S. chulsanensis	Hermiin Tsav II, Khulsan	[Three] skulls, mandibles, cervical vertebrae, dorsal vertebrae, ribs, sternum, scapulocoracoids, humerus, ulna, radius, manus, cervical half-rings, and osteoderms.	An ankylosauridalso known from the Nemegt Formation.
Tarchia	T. kielanae	Hermiin Tsav II, Khulsan	[Two] partial skulls, osteoderms, and [three] undescribed specimens.	An ankylosauridalso known from a second species, T. teresae, which was found in the Nemegt Formation.
Zaraapelta	Z. nomadis	Hermiin Tsav	A partial skull missing the rostrum.	An ankylosauridknown from a subadult individual.
Ankylosauridaeindet.	Indeterminate	Hermiin Tsav	Dorsal vertebrae, ribs, pectoral girdles, forelimbs, pelvic girdles, hindlimbs, and osteoderms.	An ankylosauridknown from a specimen preserved in a "resting posture".

Ceratopsians[]

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Genus	Species	Location	Material	Notes	Images
Bagaceratops	B. rozhdestvenskyi	Hermin Tsav, Khulsan	"Multiple specimens with partial to nearly complete skulls and skeletons."	A protoceratopsid. Gobiceratops, Lamaceratops, and Platyceratopsare now considered synonyms of Bagaceratops.	https://upload.wikimedia.org/wikipedia/commons/thumb/0/09/Bagaceratops_Restoration.png/200px-Bagaceratops_Restoration.png
Breviceratops	B. kozlowskii	Khulsan	"Two skulls and partial skeleton remains."	A protoceratopsid.	https://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Breviceratops_Restoration.png/200px-Breviceratops_Restoration.png
Udanoceratops?	Indeterminate	Baga Tariach	"Partial juvenile specimen."	A giant leptoceratopsid.	https://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Udanoceratops_Restoration.png/200px-Udanoceratops_Restoration.png

Pachycephalosaurs[]

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Genus	Species	Location	Material	Notes	Images
Tylocephale	T. gilmorei	Khulsan	"Partial skull."	A pachycephalosaurid.

Sauropods[]

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Genus	Species	Location	Material	Notes	Images
Faveoloolithus	F. ningxiaensis	Hermiin Tsav, Ikh Shunkht, Ologoy Ulan Tsav	"Eggs, egg clutches and shells."	Eggs probably laid by a sauropod.
Quaesitosaurus	Q. orientalis	Shar Tsav	"Partial skull."	A titanosaur.

Theropods[]

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Alvarezsaurs[]

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Genus	Species	Location	Material	Notes
Ceratonykus	C. oculatus	Hermiin Tsav	"Partial skull with skeleton."	An alvarezsaurid.
Jaculinykus	J. yaruui	Nemegt	A nearly complete articulatedskeleton including much of the skull	A parvicursorinealvarezsaurid.
Khulsanurus	K. magnificus	Khulsan	"Partial skeleton, including cervical and caudal vertebrae, scapulocoracoids, humerus, and pubis."	An alvarezsaurid.
Ondogurvel	O. alifanovi	Nemegt	"Partial postcranial skeleton," including dorsaland sacralvertebrae and hip and leg bones.	An alvarezsaurid.
Parvicursor	P. remotus	Khulsan	"Partial vertebrae, pelvic girdle and hindlimbs."	An alvarezsaurid

Birds[]

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Genus	Species	Location	Material	Notes
Gobioolithus	G. major	Gilbent, Khulsan	"Five eggs."	Eggs probably laid by a bird.
Gobioolithus	G. minor	Hermiin Tsav, Khulsan	"Eggs with embryonic remains."	Eggs probably laid by Gobipipus.
Gobipipus	G. reshetovi	Hermiin Tsav, Khulsan	"Embryonic skulls and skeletons."	An enantiornithine.
Gobipteryx	G. minuta	Hermiin Tsav, Khulsan	"Skulls and partial skeletons, and embryonic remains."	An enantiornithine. Also present in the Djadokhta Formation.
Hollanda	H. luceria	Hermiin Tsav	"Partial hindlimbs from several specimens."	An ornithuromorph.
Protoceratopsidovum'	P. fluxuosum	Hermiin Tsav, Khulsan	"Clutch of 19 eggs and isolated eggs."	Eggs probably laid by a bird.
	P. minimum	Ikh Shunkht	"Clutch of eggs."	Eggs probably laid by a bird.
	P. sincerum	Hermiin Tsav	"Partial egg."	Eggs probably laid by a bird.
Styloolithus	S. sabathi	Khulsan	"Partial eggs."	Eggs probably laid by a bird.

Dromaeosaurids[]

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Genus	Species	Location	Material	Notes
Hulsanpes	H. perlei	Khulsan	Partial foot and skull bone	A halszkaraptorine
Kuru	K. kulla	Khulsan	"Fragmentary skeleton."	A dromaeosaurid.
Natovenator	N. polydontus	Hermiin Tsav	Partial articulated skeleton with skull	A halszkaraptorine
Shri	S. devi	Khulsan	"Articulated skeleton lacking skull."	A dromaeosaurid.
Velociraptorinaeindet.	Indeterminate	Hermin Tsav, Khulsan	Not specified.	A dromaeosaurid.

Troodontids[]

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Genus	Species	Location	Material	Notes	Images
Harenadraco	H. prima	Hermiin Tsav	Partial leg, foot, and hip bones	A troodontid

Oviraptorosaurs[]

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Genus	Species	Location	Material	Notes
Conchoraptor	C. gracilis	Hermin Tsav, Khulsan	"Multiple specimens with skulls and partial skeletons."	An oviraptorid. Also present in the Nemegt Formation.
Heyuannia	H. yanshini	Hermiin Tsav	"Partial skulls and skeletons."	An oviraptorid. Originally identified as Ajancingeniaand "Ingenia".
Nemegtomaia	N. barsboldi	Nemegt