Dzunbain Formation

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]

Dzunbain Formation
Stratigraphic range:
TypeGeological formation
Sub-units
  • Chamrin-Us Member
  • Khovboor Member
Thicknessup to 60 metres (200 ft) at Chamrin-Us
Lithology
PrimaryClaystone and sandstone
Location
Coordinates42.45°N 102.417°E / 42.45; 102.417
RegionErdene District, Dornogovi Province, Mongolia
Country Mongolia

Paleobiota of the Dzunbain Formation

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

Squamates
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

Mammals
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

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

Dinosaurs
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

See also

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, 35 pp. [in Russian]. PDF.
  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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