Earth:Udurchukan Formation

From HandWiki
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
Coordinates [ ⚑ ] : 49°30′N 129°30′E / 49.5°N 129.5°E / 49.5; 129.5
Paleocoordinates [ ⚑ ] 51°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

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

Ornithischians

Ankylosaurs
Ankylosaurs of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Nodosauridae Indet.[1] indeterminate Kundur Upper A tooth, an incomplete tooth and an osteo dermal scute. A nodosaurid ankylosaur
Hadrosaurs
hadrosaurs of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Amurosaurus A. riabinini Blagoveschensk Upper A partial remnants of skull and lower jaw. A lambeosaurin lambeosaurine; which was the most common dinosaur in the area, a bonebed containing many specimens was unearthed in 2008.[2]
Kerberosaurus K. manakini Blagoveschensk Upper The caudal part of cranium consists of a braincase. A edmontosaurin saurolophine
Kundurosaurus K. nagornyi Kundur Upper A partial, disarticulated skull. A edmontosaurin saurolophine; possibly synonymous with Kerberosaurus manakini.
Saurolophinae Indet. Indetermidate Kundur Upper A saurolophine hadrosaurid
Olorotitan O. arharensis Kundur Upper A nearly complete skeleton. A lambeosaurin lambeosaurine

Saurischians

Sauropods
Sauropods of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Arkharavia[3] A. heterocoelica Kundur Upper A single tooth and a proximal tail vertebrae, although some remains probably belong to a hadrosaurid. A somphospondylian sauropod[4]
Opisthocoelicaudiinae Indet. Indetermidate Kundur Upper A opisthocoelicaudiine saltasaurid
Titanosauria Indet. Indetermidate Kundur Upper A titanosaurian sauropod
Theropods
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.[5] Indetermidate Kundur Upper A ornithomimid ornithomimosaur; closely related to Qiupalong henanensis.[5]
Richardoestesia R. sp Kundur Upper A coelurosaurian theropod
Saurornitholestes S. cf. sp. Kundur Upper A saurornitholestine dromaeosaurid
Theropoda Indet. Indeterminate Kundur Upper An indeterminate theropod
Troodon T. sp. Kundur Upper A troodontin troodontine
Tyrannosaurinae Indet. Indetermidate Kundur Upper A tyrannosaurine tyrannosaurid; closely related to Tyrannosaurus rex.[6]

Crocodilians

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

Turtles

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
Testudines Indet. indeterminate Kundur Upper An turtle
Trionychidae Indet. indeterminate Kundur Upper An sorftshell turtle

Mammals

Mammals of the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Image
Cimolodonta Indet. indeterminate Kundur Upper An cimolodont
Stygimys[7] S. kuszmauli Kundur Upper A eucosmodontid djadochtatherioid

Insects

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

Flora

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

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 (SEPM Society for Sedimentary Geology) 23 (3): 153–162. doi:10.2110/palo.2006.p06-031r. Bibcode: 2008Palai..23..153L. https://doi.org/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. ↑ 5.0 5.1 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. https://www.researchgate.net/publication/377971612. 
  6. ↑ Yun, Changyu. "Testing the hypotheses of the origin of Tyrannosaurus rex: immigrant species, or native species?". The Journal of Paleontological Sciences: 1–9. https://www.aaps-journal.org/pdf/JPS.C.2017.01.pdf. 
  7. ↑ 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

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



Retrieved from "https://handwiki.org/wiki/index.php?title=Earth:Udurchukan_Formation&oldid=4573474"