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Udurchukan Formation

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From Wikipedia, the free encyclopedia
Udurchukan Formation
Stratigraphic range: Maastrichtian
~70–66 Ma
TypeGeological formation
Unit ofTsagayan Group
UnderliesBureya Formation
OverliesKundur Formation
Thickness11 metres (40 ft) exposed at Kundur locality
Lithology
PrimaryConglomerate, mudstone, diamictite
OtherSandstone
Location
Coordinates49°30′N 129°30′E / 49.5°N 129.5°E / 49.5; 129.5
Approximate paleocoordinates51°24′N 115°48′E / 51.4°N 115.8°E / 51.4; 115.8
RegionAmur Oblast
CountryRussia
ExtentZeya-Bureya Basin
Udurchukan Formation is located in Russia
Udurchukan Formation
Udurchukan Formation (Russia)
Udurchukan Formation is located in Amur Oblast
Udurchukan Formation
Udurchukan Formation (Amur Oblast)

The Udurchukan Formation is a geological formation located in Amur Region, Far East Russia. Based on palynomorphs such as Wodehouseia spinata, the Udurchukan is considered of Maastrichtian age of the Late Cretaceous, during the Cretaceous Period.

Fossil record

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Dinosaurs of Udurchukan Formation

Since Wodehouseia spinata and Aquillapollenites subtilis are known in the Americas only from the Late Maastrichtian, the presence of these palynomorphs in the Udurchukan caused Godefroit to consider the unit and it's lambeosaurine dominated fauna to be coeval with the Lance Formation and Hell Creek Formation. However, research in the Songliao Basin indicates Wodehouseia spinata is also known from the early (albeit not basal) and middle Maastrichtian of Asia.

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.

Dinosaurs

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Ornithischians

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Ankylosaurs
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Ankylosaurs of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Panoplosaurini Indet.[1] indeterminate Kundur Upper A tooth, an incomplete tooth and an osteo dermal scute. A panoplosaurin nodosaurine
Hadrosaurs
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Hadrosaurs of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Amurosaurus[2][3][4] A. riabinini Blagoveschensk Upper A partial remnants of skull and lower jaw. A lambeosaurin lambeosaurine
Kerberosaurus[5] K. manakini Blagoveschensk Upper The caudal part of cranium consists of a braincase. A edmontosaurin saurolophine
Kundurosaurus[6] K. nagornyi Kundur Upper A partial, disarticulated skull and maxilla. A edmontosaurin saurolophine; possibly synonymous with Kerberosaurus manakini.
Saurolophini Indet. Indetermidate Kundur Upper A saurolophin saurolophine
Olorotitan[7] O. arharensis Kundur Upper A nearly complete skeleton. A lambeosaurin lambeosaurine

Saurischians

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Sauropods
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Sauropods of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Arkharavia[8][9] A. heterocoelica Kundur Upper A single tooth and a proximal tail vertebrae, although some remains probably belong to a hadrosaurid. A somphospondylian sauropod
Opisthocoelicaudiinae Indet.[10] Indetermidate Kundur Upper A opisthocoelicaudiine saltasaurid
Titanosauria Indet. Indetermidate Kundur Upper A titanosaurian sauropod
Theropods
[edit]
Theropods of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Albertosaurinae Indet. Indetermidate Blagoveschensk Upper A albertosaurine tyrannoaurid
Dromaeosaurinae Indet. Indetermidate. Kundur Upper A dromaeosaurine dromaeosaurid
Indeterminate. Blagoveschensk Upper
Ornithomimidae Indet.[11] Indetermidate Kundur Upper A ornithomimid ornithomimosaur; closely related to Qiupalong henanensis.
Richardoestesia R. sp Kundur Upper A coelurosaurian theropod
Saurornitholestes S. cf. sp. Kundur Upper A saurornitholestine dromaeosaurid
Therizinosauridae Indet. Indeterminate Kundur Upper A therizinosaurid therizinosauroid
Troodon T. sp. Kundur Upper A troodontin troodontine
Tyrannosaurini Indet. Indetermidate Kundur Upper A large-bodied tyrannosaurin tyrannosaurine; closely related to Tyrannosaurus rex.[12]

Crocodilians

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Crocodilians of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Orientalosuchina Indet. indeterminate Kundur Upper A orientalosuchine alligatoroid
Shamosuchus S. sp. Kundur Upper A paralligatorid neosuchian

Turtles

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Turtles of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Amuremys A. planicostata Kundur Upper A lindholmemydid turtle
Lindholmemydidae Indet. indeterminate Kundur Upper A lindholmemydid turtle
Nanhsiungchelyidae Indet. indeterminate Kundur Upper A nanhsingchelyid turtle
Trionychinae Indet. indeterminate Kundur Upper A trionychinae trionychid

Mammals

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Mammals of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Cimolodontidae Indet. indeterminate Kundur Upper A cimolodontid cimolodont
Neoplagiaulacidae Indet.[13] Indeterminate Kundur Upper Tooth A neoplagiaulacid ptilodontoid
Stygimys[14] S. kuszmauli Kundur Upper A eucosmodontid djadochtatherioid

Insects

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Insects of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Mesosigara M. kryshtofovichi Kundur Upper A corixid heteropteran

Flora

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Plants of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Cupressinoxylon C. sp. Kundur Upper A cypress

See also

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References

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  1. ↑ Tumanova, Tatiana & Bolotsky, Yu.L. & Alifanov, Vladimir. (2004). The first finds of armored dinosaurs in the Upper Cretaceous of Russia (Amur Region). Paleontological Journal. 38. 73-77.
  2. ↑ Bolotsky, Yu. L. and S.K. Kurzanov. 1991. The hadrosaurs of the Amur region. In: Geology of the Pacific Border: pp.94-103.
  3. ↑ Lauters, Pascaline; Bolotsky, Yuri L.; Van Itterbeeck, Jimmy; Godefroit, Pascal (March 1, 2008). "Taphonomy and Age Profile of a Latest Cretaceous Dinosaur Bone Bed in Far Eastern Russia". PALAIOS. 23 (3). SEPM Society for Sedimentary Geology: 153–162. Bibcode:2008Palai..23..153L. doi:10.2110/palo.2006.p06-031r. Retrieved 1 May 2021.
  4. ↑ Bertozzo F, Bolotsky I, Bolotsky YL, Poberezhskiy A, Ruffell A, Godefroit P, Murphy E (2023). "A pathological ulna of Amurosaurus riabinini from the Upper Cretaceous of Far Eastern Russia". Historical Biology: An International Journal of Paleobiology. 35 (2): 268–275. Bibcode:2023HBio...35..268B. doi:10.1080/08912963.2022.2034805. S2CID 247003496.
  5. ↑ Bolotsky, Yu.L.; Godefroit, P. (2004). "A new hadrosaurine dinosaur from the Late Cretaceous of far Eastern Russia". Journal of Vertebrate Paleontology. 24 (2): 351–365. Bibcode:2004JVPal..24..351B. doi:10.1671/1110. S2CID 130691286.
  6. ↑ Pascal Godefroit; Yuri L. Bolotsky; Pascaline Lauters (2012). "A New Saurolophine Dinosaur from the Latest Cretaceous of Far Eastern Russia". PLOS ONE. 7 (5) e36849. Bibcode:2012PLoSO...736849G. doi:10.1371/journal.pone.0036849. PMC 3364265. PMID 22666331.
  7. ↑ Godefroit, Pascal; Bolotsky, Yuri; Alifanov, Vladimir (2003). "A remarkable hollow-crested hadrosaur from Russia: an Asian origin for lambeosaurines" (PDF). Comptes Rendus Palevol. 2 (2). Cellule MathDoc/CEDRAM: 143–151. Bibcode:2003CRPal...2..143G. doi:10.1016/s1631-0683(03)00017-4. ISSN 1631-0683.
  8. ↑ Alifanov, V.R. and Bolotsky, Y.L. (2010). "Arkharavia heterocoelica gen. et sp. nov., a New Sauropod Dinosaur from the Upper Cretaceous of Far Earstern Russia." Paleontologicheskii Zhurnal, 2010(1):76-83. udk 568.192 (551.763.333) [In Russian]
  9. ↑ Mannion, Philip D.; Upchurch, Paul; Barnes, Rosie N.; Mateus, Octávio (2013). "Osteology of the Late Jurassic Portuguese sauropod dinosaur Lusotitan atalaiensis (Macronaria) and the evolutionary history of basal titanosauriforms". Zoological Journal of the Linnean Society. 168: 98–206. doi:10.1111/zoj.12029.
  10. ↑ Averianov, A.O.; Bolotsky, YL; Bolotsky, YI (2023-03-14). "A Sauropod from the Late Cretaceous of the Amur Region". Doklady Earth Sciences. 507: S418–S419. doi:10.1134/S1028334X22601547. S2CID 257498576.
  11. ↑ Averianov, A.; Skutschas, P.; Bolotsky, Y.; Bolotsky, I. (2023). "First find of an ornithomimid theropod dinosaur in the Upper Cretaceous of the Russian Far East". Biological Communications. 68 (4): 253–260. doi:10.21638/spbu03.2023.405.
  12. ↑ Yun, Changyu. "Testing the hypotheses of the origin of Tyrannosaurus rex: immigrant species, or native species?" (PDF). The Journal of Paleontological Sciences: 1–9.
  13. ↑ Skutschas, P. P.; Bapinaev, R. A.; Parakhin, I. A.; Bolotsky, I. Y.; Bolotsky, Y. L.; Averianov, A. O. (2025). "Evidence of osteophagia in Mesozoic mammals: multituberculate tooth marks on a hadrosaurid maxilla from the Late Cretaceous of the Russian Far East". Historical Biology. 38 (4): 1128–1136. doi:10.1080/08912963.2025.2501321.
  14. ↑ Averianov, A. O.; Bolotsky, Y. L.; Godefroit, P.; Bolotsky, I. Yu. (2025). "Multituberculate mammal of possible North American affinity in the Maastrichtian of the Russian Far East". Historical Biology: 1–8. doi:10.1080/08912963.2025.2557935.

Bibliography

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  • Y. A. Popov. 1971. Historical development of the infraorder Nepomorpha (Heteroptera). Akademiya Nauk SSSR, Trudy Paleontologicheskogo Instituta 129:1-228
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