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Dzunbain Formation

Early Cretaceous geologic formation in Mongolia From Wikipedia, the free encyclopedia

The Dzunbain Formation (also known as Dzunbayn Formation) is a geological formation in Mongolia, dating to the Early Cretaceous (Aptian-Albian).^[1] The formation contains fossils of mammals, reptiles, turtles and dinosaurs. The Dzunbain Formation is equivalent to the Khuren Dukh Formation.^[2]

TypeGeological formation

Sub-units

Chamrin-Us Member
Khovboor Member

Thicknessup to 60 metres (200 ft) at Chamrin-Us

PrimaryClaystone and sandstone

Quick facts Type, Sub-units ...

Dzunbain Formation
Stratigraphic range: Aptian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	Chamrin-Us Member Khovboor Member
Thickness	up to 60 metres (200 ft) at Chamrin-Us
Lithology
Primary	Claystone and sandstone
Location
Coordinates	42.45°N 102.417°E / 42.45; 102.417
Region	Erdene District, Dornogovi Province, Mongolia
Country	Mongolia

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Paleobiota of the Dzunbain Formation

Amphibians

More information Genus, Species ...


Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Eodiscoglossus^[3]	E. sp.^[3]	Khovboor

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Squamates

More information Genus, Species ...


Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Dorsetisaurus^[4]	D. sp.^[4]	Khovboor
Hoburogekko^[5]	H. suchanovi^[5]	Khovboor		"A partial skull."^[5]
Hodzhakulia^[4]	H. sp.^[4]	Khovboor
Iguania^[4]	Indeterminate^[4]	Khovboor
Lacertilia^[4]	Indeterminate^[4]	Khovboor
Paramacellodidae^[4]	Indeterminate^[4]	Khovboor
Priscagamidae^[4]	Indeterminate^[4]	Khovboor
Slavoia^[4]	S. sp.^[4]	Khovboor
Xantusiidae^[4]	Indeterminate^[4]	Khovboor
Xenosauridae^[4]	Indeterminate^[4]	Khovboor

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Mammals

More information Genus, Species ...

Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Arginbaatar^[6]	A. dimitrievae^[6]	Khovboor
Arguimus^[7]	A. khosbajari^[7]	Khovboor
Eobaatar^[8]	E. magnus and E. minor^[8]	Khovboor		"Lower jaw fragment (E. magnus)."^[8]
Gobiconodon^[9]	G. borissiaki and G. hobuvensis^[9]	Khovboor		"Both species known only from cranial remains."^[9]
Gobiotheriodon^[10]	G. infinitus^[10]	Khovboor			Previously known as "Gobiodon".^[10]
Heptoconodon	Indeterminate	Khovboor
Hovurlestes^[11]	H. noyon^[11]	Khovboor
Kielantherium^[12]	K. gobiensis^[12]	Khovboor
Monobaatar^[8]	M. mimicus^[8]	Khovboor
Prokennolestes^[13]	P. minor, P. sp. and P. trofimovi^[13]	Khovboor
Plagiaulacidae^[8]	Indeterminate^[8]	Khovboor

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Turtles

More information Genus, Species ...


Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Hangaiemys^[14]	H. hoburensis^[14]	Khovboor
Mongolemys^[14]	M. sp.^[14]	Khovboor

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Dinosaurs

More information Genus, Species ...


Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Mongolostegus^[15]	M. exspectabilis^[15]	Chamrin-Us		"Posterior dorsal and anterior caudal vertebrae as well as pelvic material."^[15]	Previously known as Wuerhosaurus mongoliensis.^[16] One of the last surviving stegosaurs.^[15]
Psittacosauridae^[17]	Indeterminate^[17]	Chamrin-Us
Psittacosaurus^[18]	P. mongoliensis^[18]	Khovboor
Sauropoda	Indeterminate	Chamrin-Us and Khovboor
Shamosaurus^[2]	S. scutatus^[2]	Chamrin-Us and Khovboor		"A complete skull, lower jaws and partial postcranial skeleton with armor. Also referred are a skull piece, lower jaw and two cervical halfrings."^[19]
Stegosauridae^[15]	Indeterminate^[15]	Chamrin-Us			One of the last surviving stegosaurs.^[15]
Troodontidae^[20]	Indeterminate^[20]	Chamrin-Us

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See also

List of dinosaur-bearing rock formations

References

[1]
Shuvalov V. F. (1974) O geologicheskom stroenii i vozraste mestonakhozhdenii Khobur i Khuren-Dukh [On the geology and age of the Khobur and Khuren-Dukh localities], Mesozoic and Cenozoic Faunas and Biostratigraphy of Mongolia; The Joint Soviet-Mongolian Paleontological Expedition, Transactions 1, 296-304
[2]
T.A. Tumanova, (1983), "Pervyy ankilozavr iz nizhnego mela Mongolii", In: L.P. Tatarinov, R. Barsbold, E. Vorobyeva, B. Luvsandanzan, B.A. Trofimov, Yu. A. Reshetov, & M.A. Shishkin (eds.), Iskopayemyye reptilii mongolii. Trudy Sovmestnaya Sovetsko-Mongol'skaya Paleontologicheskaya Ekspeditsiya 24: 110-118
[3]
Shishkin M. A. (2000) Mesozoic amphibians from Mongolia and the Central Asiatic republics, The Age of Dinosaurs in Russia and Mongolia, 297-308
[4]
Alifanov V. R. (2000) The fossil record of Cretaceous lizards from Mongolia, The Age of Dinosaurs in Russia and Mongolia, 368-389
[5]
Alifanov, V.R. (1989) The oldest gecko (Lacertilia, Gekkonidae) from the Lower Cretaceous of Mongolia. Paleontologicheskii Zhurnal 1989:124–126. [in Russian].
[6]
Trofimov (1980) Multituberculata and Symmetrodonta from the Lower Cretaceous deposits in Mongolia. Trans. (Dokl) USSR Acad Sci, Earth Sci Sect 251. p. 188-191.
[7]
D. Dashzeveg. (1979). Arguimus khosbajari gen. n, sp. n (Peramuridae, Eupantotheria) from the Lower Cretaceous of Mongolia. Acta Palaeontologica Polonica 24(2):199-204
[8]
Kielan-Jaworowska et al. (1987), "Early Cretaceous multituberculates from Mongolia and a comparison with Late Jurassic form". Acta Palaeontologica Polonica 32, p. 3-47.
[9]
Lopatin, Alexey; Averianov, Alexander (2015). "Gobiconodon (Mammalia) from the Early Cretaceous of Mongolia and Revision of Gobiconodontidae". Journal of Mammalian Evolution. 22 (1): 17–43. doi:10.1007/s10914-014-9267-4. ISSN 1064-7554.
[10]
B. A. Trofimov. (1997). A new generic name Gobiotheriodon for a symmetrodont mammal Gobiodon Trofimov, 1980. Acta Palaeontologica Polonica 42(4):496
[11]
Lopatin, A. V.; Averianov, A. O. (2018). "A New Stem Placental Mammal from the Early Cretaceous of Mongolia". Doklady Biological Sciences. 478 (1): 8–11. doi:10.1134/s0012496618010027. ISSN 0012-4966.
[12]
D. Dashzeveg. (1975). New primitive therian from the early Cretaceous of Mongolia. Nature 256:402-403
[13]
Z. Kielan-Jaworowska and D. Dashzeveg. (1989). Eutherian mammals from the Early Cretaceous of Mongolia. Zoologica Scripta 18(2):347-355
[14]
V. B. Sukhanov. (2000). Mesozoic turtles of Middle and Central Asia. In M. J. Benton, M. A. Shishkin, D. M. Unwin, & E N. Kurichkin (eds.), The Age of Dinosaurs in Russia and Mongolia
[15]
T. A. Tumanova & V. R. Alifanov (2018) First Record of Stegosaur (Ornithischia, Dinosauria) from the Aptian-Albian of Mongolia. Paleontological Journal 52(14) DOI: https://doi.org/10.1134/S0031030118140186 https://link.springer.com/article/10.1134/S0031030118140186
[16]
Ulansky, Roman. E. (2014). "Evolution of the stegosaurs (Dinosauria; Ornithischia). Dinologia" (PDF). dinoweb.narod.ru (in Russian). p. 35.
[17]
Suslov Y. V., Barsbold R. (1983) Zakhoroneniye psittakozavrov v Khamryn-us (Vostochnaya Gobi, MNR), Trudy - Sovmestnaya Sovetsko-Mongol'skaya Paleontologicheskaya Ekspeditsiya 24, 118-120
[18]
Kalandadze N. N., Kurzanov S. M. (1974) Nizhnemelove mestonakhozhdeniya nazemnykh pozvonochnykh Mongolii [Lower Cretaceous terrestrial vertebrate localities of Mongolia], Mesozoic and Cenozoic Faunas and Biostratigraphy of Mongolia. The Joint Soviet-Mongolian Paleontological Expedition, Transactions 1, 288-295
[19]
Arbour, Victoria Megan, (2014). Systematics, evolution, and biogeography of the ankylosaurid dinosaurs. Ph.D thesis, University of Alberta
[20]
Barsbold R., Osmólska H., et al (1987) On a new troodontid (Dinosauria, Theropoda) from the Early Cretaceous of Mongolia, Acta Palaeontologica Polonica 32 1-2, 121-132

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