Udurchukan Formation

Udurchukan Formation
Stratigraphic range: Maastrichtian
Type Geological formation
Unit of Tsagayan Group
Underlies Bureya Formation
Overlies Kundur Formation
Thickness 11 metres (40 ft) exposed at Kundur locality
Lithology
Primary Conglomerate, Mudstone, Diamictite
Other Sand
Location
Region Northeast Asia
Country  Russia
Extent 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 Upper Cretaceous, during the Cretaceous Period.

Fossil record

Inasmuch as 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.

The latest view, appearing in the paper on comparative osteology of Edmontosaurus and Shantungosaurus, is that one Udurchukan Formation locality, Kundur, is late−early Maastrichtian; and the other, Blagoveschensk, is early−late Maastrichtian. The Udurchukan Formation now appears somewhat older than the Lance and Hell Creek, albeit not by much.

Dinosaurs

Dinosaurs reported from the Udurchukan Formation
Genus Species Location Stratigraphic position Material Notes Images

Amurosaurus

A. riabinini

A lambeosaurine hadrosaur

Arkharavia

A. heterocoelica

A single tooth, proximal tail vertebrae.

The holotype belongs to a sauropod, but the other remains probably represent a Hadrosaur.[1]

Kundurosaurus

K. nagornyi

A hadrosaur

See also

  • Geology of Russia
  • Fossils of Russia

References

  1. ↑ 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. doi:10.1111/zoj.12029.


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