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Geological formation in Mongolia
Khuren Dukh Formation
Stratigraphic range: Early Cretaceous
(Aptian–Albian),[1] 119.7–100 Ma
TypeGeological formation
Sub-unitsLower, Middle & Upper Members
UnderliesTerrace deposit, Basalt
OverliesKhalzan Uul Formation, Basement
ThicknessOver 100 m (330 ft)
Lithology
PrimarySandstone, conglomerate, siltstone, mudstone
Location
Coordinates45°54′N 108°24′E / 45.9°N 108.4°E / 45.9; 108.4
Approximate paleocoordinates49°18′N 100°12′E / 49.3°N 100.2°E / 49.3; 100.2
RegionDornogovi Province
CountryMongolia
ExtentChoyr Basin

The Khuren Dukh Formation, also known as the Khukhtyk Formation, Khukhteeg Formation, or Hühteeg Svita, (Mongolian: Хөхтээг формаци, Khökhteeg Formatsi), is a geological formation in Mongolia whose strata date back to the Aptian–Albian ages of the Early Cretaceous.[2][3] Dinosaur remains are among the fossils that have been recovered from the formation.[4]

Vertebrate paleofauna

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Dinosaurs

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Dinosaurs of the Khuren Dukh Formation (Hühteeg Svita)
Genus Species Location Stratigraphic position Material Notes Images
Altirhinus A. kurzanovi "Complete skull, partial skull, associated postcrania, several individuals."[5] A hadrosauroid ornithopod
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Choyrodon[6] C. barsboldi Partial skull, cervical ribs A hadrosauroid ornithopod
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Iguanodon I. orientalis An indeterminate Iguanodont. A referred skull was reclassified as Altirhinus.
Harpymimus[7] H. okladnikovi Partial skeleton An ornithomimosaur
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Zavacephale[8] Z. rinpoche Skull and partial articulated skeleton An early pachycephalosaur
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Choristoderes

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Choristoderes of the Khuren Dukh Formation (Hühteeg Svita)
Genus Species Location Stratigraphic position Material Notes Images
Khurendukhosaurus K. orlovi, Indeterminate Partial skeleton Long-necked choristodere
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Tchoiria T. namsarai Crocodile-like neochoristoderan.
Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

See also

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References

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  1. ^ Hasegawa, Hitoshi; Ando, Hisao; Hasebe, Noriko; Ichinnorov, Niiden; Ohta, Tohru; Hasegawa, Takashi; Yamamoto, Masanobu; Li, Gang; Erdenetsogt, Bat-Orshikh; Heimhofer, Ulrich; Murata, Takayuki; Shinya, Hironori; Enerel, G.; Oyunjargal, G.; Munkhtsetseg, O. (2018-02-27). "Depositional ages and characteristics of Middle– Upper Jurassic and Lower Cretaceous lacustrine deposits in southeastern Mongolia". Island Arc. 27 (3). Bibcode:2018IsArc..27E2243H. doi:10.1111/iar.12243. ISSN 1038-4871.
  2. ^ Nosova, Natalya; Kostina, Elena (2022-09-01). "New findings of the female reproductive structures of Umaltolepis Krassilov and associated leaves of Pseudotorellia Florin in the Lower Cretaceous of Mongolia". Review of Palaeobotany and Palynology. 304 104696. Bibcode:2022RPaPa.30404696N. doi:10.1016/j.revpalbo.2022.104696. ISSN 0034-6667.
  3. ^ Nichols et al., 2006
  4. ^ Weishampel et al., 2004, pp.563-570
  5. ^ "Table 19.1," in Weishampel, et al. (2004). Page 415.
  6. ^ Gates et al., 2018
  7. ^ Barsbold & Perle, 1984
  8. ^ Chinzorig, Tsogtbaatar; Takasaki, Ryuji; Yoshida, Junki; Tucker, Ryan T.; Buyantegsh, Batsaikhan; Mainbayar, Buuvei; Tsogtbaatar, Khishigjav; Zanno, Lindsay E. (September 17, 2025). "A domed pachycephalosaur from the early Cretaceous of Mongolia". Nature: 1–8. doi:10.1038/s41586-025-09213-6. ISSN 1476-4687.

Bibliography

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