Iren Dabasu Formation - AbsoluteAstronomy.com

The Iren Dabasu Formation is a Mesozoic

Mesozoic

The Mesozoic era is an interval of geological time from about 250 million years ago to about 65 million years ago. It is often referred to as the age of reptiles because reptiles, namely dinosaurs, were the dominant terrestrial and marine vertebrates of the time...

geologic formation. Dinosaur

Dinosaur

Dinosaurs are a diverse group of animals of the clade and superorder Dinosauria. They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period until the end of the Cretaceous , when the Cretaceous–Paleogene extinction event led to the extinction of...

remains diagnostic to the genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

level are among the fossils that have been recovered from the formation.

Ornithischians

Ornithischians reported from the Iren Dabasu Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Bactrosaurus Bactrosaurus Bactrosaurus is a genus of herbivorous dinosaur that lived in east China during the late Cretaceous, about 70 mya. The position Bactrosaurus occupies in the Cretaceous makes it one of the earliest known hadrosaurs, and although it is not known from a full skeleton, Bactrosaurus is one of the best...	B. johnsoni			"Disarticulated, associated skull and postcranial material pertaining to at least [twelve] individuals, juvenile to adult."
Gilmoreosaurus Gilmoreosaurus Gilmoreosaurus is the name given to a genus of dinosaur from the Cretaceous of Asia. The type species is Gilmoreosaurus mongoliensis. It is believed to be a hadrosaur or iguanodont from the Iren Dabasu Formation of Mongolia, dating to 70 Ma ago. Additional specimens have been described as distinct...	G. mongoliensis			"Isolated skull material, associated, disarticulated postcrania, at least [eight] individuals."

Saurischians

Saurischians reported from the Iren Dabasu Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Alectrosaurus Alectrosaurus Alectrosaurus is a genus of tyrannosaurid theropod dinosaur from the Late Cretaceous Period of Inner Mongolia. It was a bipedal carnivore with a body shape similar to its much larger relative, Tyrannosaurus rex...	A. olseni
Archaeornithomimus Archaeornithomimus Archaeornithomimus is a genus of ornithomimosaurian theropod dinosaur from the Late Cretaceous of China, 70 million years ago....	A. asiaticus			"Partial manus, metatarsus, vertebrae, limb elements."
Avimimus Avimimus Avimimus , meaning "bird mimic" , was a genus of bird-like maniraptoran dinosaur that lived in the late Cretaceous in what is now Mongolia, around 70 million years ago.-Description:...	A. portentosus
Erliansaurus Erliansaurus Erliansaurus is a genus of therizinosauroid theropod dinosaur from the Late Cretaceous of China.A fossil of Erliansaurus was found near Sanhangobi in Inner-Mongolia. The type species, Erliansaurus bellamanus, was described by Xu Xing, Zhang Xiaohong, Paul Sereno, Zhao Xijin, Kuang Xuewen, Han Jun...	E. bellamanus			"Partial skeleton."
Garudimimus Garudimimus Garudimimus is a basal ornithomimosaurian theropod dinosaur from the Upper Cretaceous of Mongolia.-Discovery and naming:...	Indeterminate
Gigantoraptor Gigantoraptor Gigantoraptor is a genus of giant oviraptorosaurian theropod dinosaur that lived 70 million years ago during the late Cretaceous Period. It was discovered in 2005 in the Iren Dabasu Formation, Erlian basin, in Inner Mongolia.-Discovery and naming:...	G. erlianensis
Mononykus Mononykus Mononykus was a theropod dinosaur from late Cretaceous Mongolia with long, skinny legs. It moved about on two legs, was very nimble, and could run at high speeds, something that would have been useful in the open desert plains where it lived...	M. olecranus
Neimongosaurus Neimongosaurus Neimongosaurus is a genus of herbivorous therizinosaur theropod dinosaur known from the Upper Cretaceous of Nei Mongol, China....	N. yangi			"[Two] specimens with most of the axial column, many limb and girdle elements, [and a] dentary."
Saurornithoides Saurornithoides Saurornithoides is a genus of troodontid maniraptoran dinosaur, living during the Late Cretaceous period. These creatures were predators, which could run fast on their hind legs and had excellent sight and hearing...	Indeterminate
Velociraptor Velociraptor Velociraptor is a genus of dromaeosaurid theropod dinosaur that existed approximately 75 to 71 million years ago during the later part of the Cretaceous Period. Two species are currently recognized, although others have been assigned in the past. The type species is V. mongoliensis; fossils...	Indeterminate

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