Udurchukan Formation

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.

Fossil content

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 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.

Dinosaurs

Ornithischians

Ankylosaurs Anylosaurs reported from the Udurchukan Formation Taxon Species Location Stratigraphic position Material Notes ImagesNodosauridaeTumanova, 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. indet. Kundur UpperA tooth, an incomplete tooth and an osteo dermal scute. A nodosaurid ankylosaur

Hadrosaurs Hadrosaurs reported from the Udurchukan Formation Taxon Species Location Stratigraphic position Material Notes Images Amurosaurus A. riabinini Blagoveschensk 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. Kerberosaurus K. manakini Blagoveschensk The caudal part of cranium consists of a braincase. A edmontosaurin saurolophine Kundurosaurus K. nagornyi Kundur A partial, disarticulated skull. A edmontosaurin saurolophine; possibly synonymous with Kerberosaurus manakini. Hadrosaurinae indet.Indetermidate Olorotitan O. arharensis Kundur A nearly complete skeleton. A lambeosaurin lambeosaurine

Sauropods Sauropods reported from the Udurchukan Formation Taxon Species Location Stratigraphic position Material Notes Images ArkharaviaAlifanov, 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. A. heterocoelica Kundur Upper A single tooth and a proximal tail vertebrae, although some remains probably belong to a hadrosaurid. A somphospondylan sauropod Opisthocoelicaudiinae indet.IndetermidateTitanosauria indet.Indetermidate

Theropods Theropods reported from the Udurchukan Formation Taxon Species Location Stratigraphic position Material Notes ImagesAlbertosaurinae indet. IndetermidateDromaeosaurinae indet. Indetermidate IndeterminateOrnithomimidae indet. Indetermidate Described as being very similar to Qiupalong Richardoestesia R. sp Saurornitholestes S. cf. sp. Theropoda indet. IndeterminateTroodon T. sp. Tyrannosaurinae indet. Indetermidate Similar in size to Tyrannosaurus

Reptiles Reptiles reported from the Udurchukan Formation Taxon Species Location Stratigraphic position Material Notes Images AmuremysA. planicostata A lindholmemydid turtle Crocodylia indet. IndeterminateLindholmemydidae indet. IndeterminateShamosuchusS. sp. Testudines indet. IndeterminateTrionychidae indet.Indeterminate

Mammals Mammals reported from the Udurchukan FormatonTaxonSpeciesLocationStratigraphic PositionMaterialNotesImagesCimolodonta indet.Indeterminate Stygimys S. kuszmauli A eucosmodontid djadochtatherioid

Insects Insects reported from the Udurchukan Formation Taxon Species Location Stratigraphic position Material Notes Images MesosigaraM. kryshtofovichi

Flora Plants reported from the Udurchukan Formation Taxon Species Location Stratigraphic position Material Notes Images Cupressinoxylon C. sp.

Udurchukan Formation

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