Udurchukan Formation

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The Udurchukan Formation is a palaeontological formation located in Amur Region, Far East Russia.1 Based on palynomorphs such as Wodehouseia spinata the Udurchukan is considered of Maastrichtian age. Inasmuch as W. spinata and Aquillapollenites subtilis are known, in America, only from the late Maastrichtian, the presence of these palynomorphs in the Udurchukan caused Godefroit to assign the unit a late Maastrichtian age. However, research in the Songliao basin indicates Wodehouseia spinata is also known from the early (albeit not basal) and middle Maastrichtian of Asia. Ergo, a late Maastrichtian age for Amur localities, while possible, is not certain. The Udurchukan and other Amur units are not necessarily coeval with the Lance and Hell Creek.


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


A. riabinini

A lambeosaurine hadrosaur


A. heterocoelica

A single tooth, proximal tail vertebrae.

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


K. nagornyi

A hadrosaur

See also[edit]


  1. ^ P. D. Mannion, P. Upchurch, R. N. Barnes and O. Mateus. (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.