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Bayan Mandahu Formation

Type

Geological formation

Age

Late Cretaceous
(late Santonian?–early Campanian)

Lithology

Sandstone

Named After

Bayan Mandahu

Location

Inner Mongolia

Region

Asia

Country

China

The Bayan Mandahu Formation is a geological unit of "redbeds" located near the village of Bayan Mandahu in Inner Mongolia, China Asia (Gobi Desert) and dates from the Late Cretaceous Period. Laid down in the early Campanian, possibly starting in the latest Santonian, it is dated somewhat uncertainly at about 84-75 mya (million years ago).

The paleoenvironment it preserves was semi-arid and characterized by alluvial (stream-deposited) and eolian (wind-deposited) sediments. The formation is known for its vertebrate fossils, most of which are preserved in unstrcutured sandstone, indicating burial by wind-blown sandstorms.[1]

FaunaEdit

The fauna of the Bayan Mandahu is very similar in composition to the nearby Djadochta Formation, and the two may have been deposited at roughly the same time. These two formations share many of the same genera, but differ in the makeup of species. For example, the most common mammal in the Djadochta is Kryptobaatar dashzevegi, while in the Bayan Mandahu, it is the closely related Kryptobaatar mandahuensis. Similarly, the dinosaur fauna of the Djadochta includes Protoceratops andrewsi and Velociraptor mongoliensis, while the Bayan Mandahu contains Protoceratops hellenikorhinus and Velociraptor osmolskae.[2]

Birds and other theropodsEdit

Theropod dinosaurs of the Bayan Mandahu Formation
Taxa Presence Description Images
Eggs similar to those attributed to Gobipteryx minuta in the Djadochta Formation.
Velociraptor dinoguy2

Velociraptor mongoliensis

An oviraptorid similar to O. philoceratops.
Also present in the Djadochta Formation. A troodontid.
A tyrannosaur of uncertain classification.
Also present in the Djadochta Formation. A dromaeosaurid.
A dromaeosaurid.

CrocodylomorphsEdit

Crocodylomorphs of the Bayan Mandahu Formation
Taxa Presence Description Images
A mesoeucrocodylian.

LizardsEdit

Lizards of the Bayan Mandahu Formation
Taxa Presence Description Images
An agamid.
Worm lizards.
A diploglossan.
Iguanian lizards.
A monitor lizard.

MammalsEdit

Mammals of the Bayan Mandahu Formation
Taxa Presence Description Images
Also present in the Djadochta Formation. A placental.
The most common mammal in this formation.[2] A multituberculate.
Multituberculates.

Ornithischian dinosaursEdit

Ornithischian dinosaurs of the Bayan Mandahu Formation
Taxa Presence Description Images
A hadrosaur of uncertain classification.
MagnirostrisDodsoni(Skull)-PaleozoologicalMuseumOfChina-May23-08

Skull of Magnirostris dodsoni

File:Pinacosaurus skull.jpg
A ceratopsian.
An ankylosaur.
A ceratopsian.
A giant ceratopsian.

SauropodsEdit

Sauropod dinosaurs of the Bayan Mandahu Formation
Taxa Presence Description Images
A diplodocid of uncertain classification.

TurtlesEdit

Turtles of the Bayan Mandahu Formation
Taxa Presence Description Images
A softshell turtle.

See alsoEdit

ReferencesEdit

  1. ^ a b c d e f g h i j k l m n o p q r Jerzykiewicz, T.; Currie, P.J., Eberth, D.A., Johnston, P.A., Koster, E.H., and Zheng J. (1993). "Djadokhta correlative strata in Chinese Inner Mongolia: An overview of the stratigraphy, sedimentary geology, and paleontology and comparisons with the type locality in the pre-Altai Gobi.". Canadian Journal of Earth Sciences 30: 2180–2195.  [printed early 1994]
  2. ^ a b c d e Godefroit, Pascal; Currie, Philip J.; Li Hong; Shang Chang Yong; and Dong Zhi-ming (2008). "A new species of Velociraptor (Dinosauria: Dromaeosauridae) from the Upper Cretaceous of northern China". Journal of Vertebrate Paleontology 28 (2): 432–438. doi:10.1671/0272-4634(2008)28[432:ANSOVD]2.0.CO;2. 

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