Khuren Dukh Formation

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]

Khuren Dukh Formation
Stratigraphic range: Early Cretaceous (Aptian–Albian),[1] 119.7–100 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	Lower, Middle & Upper Members
Underlies	Terrace deposit, Basalt
Overlies	Khalzan Uul Formation, Basement
Thickness	Over 100 m (330 ft)
Lithology
Primary	Sandstone, conglomerate, siltstone, mudstone
Location
Coordinates	45.9°N 108.4°E / 45.9; 108.4
Approximate paleocoordinates	49.3°N 100.2°E / 49.3; 100.2
Region	Dornogovi Province
Country	Mongolia
Extent	Choyr Basin
Khuren Dukh Formation (Mongolia)

Vertebrate paleofauna

Dinosaurs

The earliest record of Pachycephalosauria.^[5]

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."[6]	A hadrosauroid ornithopod
Choyrodon[7]	C. barsboldi			Partial skull, cervical ribs	A hadrosauroid ornithopod
Iguanodon	I. orientalis				An indeterminate Iguanodont. A referred skull was reclassified as Altirhinus.
Harpymimus[8]	H. okladnikovi			Partial skeleton	An ornithomimosaur

Choristoderes

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
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

• List of dinosaur-bearing rock formations

References

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. https://vertpaleo.org/wp-content/uploads/2023/10/2023_SVP_Program-Final-10032023.pdf ^{[bare URL PDF]}
6. "Table 19.1," in Weishampel, et al. (2004). Page 415.
7. Gates et al., 2018
8. Barsbold & Perle, 1984

Bibliography

• Gates, Terry A.; Tsogtbaatar, Khishigjav; Zanno, Lindsay E.; Chinzorig, Tsogtbaatar; Watabe, Mahito (2018), "A new iguanodontian (Dinosauria: Ornithopoda) from the Early Cretaceous of Mongolia", PeerJ, 6: e5300, doi:10.7717/peerj.5300, PMC 6078070, PMID 30083450
• Nichols, Douglas J.; Matsukawa, Masaki; Ito, Makoto (2006), "Palynology and age of some Cretaceous nonmarine deposits in Mongolia and China", Cretaceous Research, 27 (2): 241–251, Bibcode:2006CrRes..27..241N, doi:10.1016/j.cretres.2005.11.004, ISSN 0195-6671
• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21
• Barsbold, R.; Perle, A. (1984), "On first new find of a primitive orithomimosaur from the Cretaceous of the MPR", Paleontologicheskii Zhurnal, 2: 121–123