Udurchukan Formation

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Udurchukan Formation
Stratigraphic range: Maastrichtian
~70–66  Ma
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Type Geological formation
Unit of Tsagayan Group
Underlies Bureya Formation
Overlies Kundur Formation
Thickness11 metres (40 ft) exposed at Kundur locality
Lithology
Primary Conglomerate, mudstone, diamictite
Other Sandstone
Location
Coordinates 49°30′N129°30′E / 49.5°N 129.5°E / 49.5; 129.5
Approximate paleocoordinates 51°24′N115°48′E / 51.4°N 115.8°E / 51.4; 115.8
Region Amur Oblast
Country Russia
Extent Zeya-Bureya Basin
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Udurchukan Formation (Russia)
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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.

Contents

Fossil record

Dinosaurs of Udurchukan Formation Olorotitan, Anserimimus, and Charonosaurus.jpg
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 its lambeosaur 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.


Dinosaurs

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Ornithischians

Ankylosaurs
Ankylosaurs reported from the Udurchukan Formation
TaxonSpeciesLocationStratigraphic positionMaterialNotesImages
Nodosauridae [1] indet.KundurUpperA tooth, an incomplete tooth and an osteo dermal scute.An indeterminate nodosauridae.
Hadrosaurs
Hadrosaurs reported from the Udurchukan Formation
TaxonSpeciesLocationStratigraphic positionMaterialNotesImages
Amurosaurus A. riabininiBlagoveschenskA partial remnants of skull and lower jaw.A lambeosaurine hadrosaur which was the most common dinosaur in the area, a bonebed containing many specimens was unearthed in 2008. [2]
AmurosaurusBrussels.jpg
Kerberosaurus K. manakiniBlagoveschenskThe caudal part of cranium consists of a braincase.A saurolophine hadrosaur
Kerberosaurus manakini.png
Kundurosaurus K. nagornyiKundurA partial, disarticulated skull.A saurolophine hadrosaur; possibly synonymous with Kerberosaurus
Kundurosaurus.tif
Hadrosaurinae Indetermidate
Olorotitan O. arharensisKundurA nearly complete skeleton.A hadrosaur
Olorotitan DB.jpg

Sauropods

Sauropods reported from the Udurchukan Formation
TaxonSpeciesLocationStratigraphic positionMaterialNotesImages
Arkharavia [3] A. heterocoelicaKundurUpperA single tooth and a proximal tail vertebrae, although some remains probably belong to a hadrosaurid.A Somphospondyli sauropod. [4]
Arkharavia.png
Opisthocoelicaudiinae Indetermidate.
Titanosauria Indetermidate

Theropods

Theropods reported from the Udurchukan Formation
TaxonSpeciesLocationStratigraphic positionMaterialNotesImages
Albertosaurinae Indetermidate
Dromaeosaurinae Indetermidate.
Indeterminate.
Ornithomimidae [5] Indetermidate.Described as being very similar to Qiupalong [5]
Richardoestesia R. sp
Saurornitholestes S. cf. sp.
Theropoda Indeterminate
Troodon T. sp.
Tyrannosaurinae Indetermidate.described as being similar in size to tyrannosaurus [6]

Other fossils

Reptiles
Insects
Flora

See also

References

  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. ↑ 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.
  3. ↑ Alifanov, Vladimir & Bolotsky, Yu. (2010). Arkharavia heterocoelica gen. et sp. nov., a new sauropod dinosaur from the Upper Cretaceous of the Far East of Russia. Paleontological Journal. 44. 84-91. 10.1134/S0031030110010119.
  4. ↑ 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 .
  5. 1 2 Averianov, Alexander; Skutschas, Pavel; Bolotsky, Yuriy; Bolotsky, Ivan (2023-12-31). "First find of an ornithomimid theropod dinosaur in the Upper Cretaceous of the Russian Far East". Biological Communications. 68 (4). doi: 10.21638/spbu03.2023.405 . ISSN   2587-5779.
  6. ↑ https://www.researchgate.net/publication/315770247.{{cite web}}: Missing or empty |title= (help)

Bibliography

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