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] | |
| 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°54′N 108°24′E / 45.9°N 108.4°E |
| Approximate paleocoordinates | 49°18′N 100°12′E / 49.3°N 100.2°E |
| Region | Dornogovi Province |
| Country |  Mongolia |
| Extent | Choyr Basin |
  Khuren Dukh Formation (Mongolia) | |
Vertebrate paleofauna
editDinosaurs
editThe 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 | .jpg) | ||
Choristoderes
edit| 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
|
Notes Uncertain or tentative taxa are in small text; |
See also
editReferences
edit- ^ 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.
- ^ 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.
- ^ Nichols et al., 2006
- ^ Weishampel et al., 2004, pp.563-570
- ^ https://vertpaleo.org/wp-content/uploads/2023/10/2023_SVP_Program-Final-10032023.pdf [bare URL PDF]
- ^ "Table 19.1," in Weishampel, et al. (2004). Page 415.
- ^ Gates et al., 2018
- ^ Barsbold & Perle, 1984
Bibliography
edit- 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