Khilok Formation Explained

Khilok Formation
Type:	Geological formation
Age:	Aptian ~
Period:	Aptian
Prilithology:	Trachybasalt
Otherlithology:	Conglomerate, sandstone
Region:	Buryatia
Coordinates:	50.7°N 107.9°W
Paleocoordinates:	52.7°N 105.6°W
Thickness:	900-

The Khilok Formation is an Early Cretaceous geologic formation in Buryatia, Russia. While the lower portion of the formation consists of sandstone and conglomerates, the upper portion of the formation largely consists of trachybasalt, these deposits have been dated to the Aptian.^[1] A thin 20 cm bed is known from the formation containing the remains of numerous indeterminate vertebrates, including dinosaur and pterosaurs and an indeterminate species of Kirgizemys.^[2]

Fossil content

The following fossils were reported from the formation:^[3]

Reptiles

• Kirgizemys sp.
• Prodeinodon sp.
• Choristodera indet.
• Dromaeosauridae indet.
• Hypsilophodontidae indet.
• Ornithopoda indet.
• Ornithocheiridae indet.
• Scincomorpha indet.
• Testudines indet.
• Titanosauriformes indet.

Amphibians

• Discoglossidae indet.

Fish

• Hybodus sp.
• Amiiformes indet.
• Palaeonisciformes indet.
• Teleostei indet.

See also

• List of pterosaur-bearing stratigraphic units
• Murtoi Formation

Notes and References

1. Zavialova. Natalia. Markevich. Valentina. Bugdaeva. Eugenia. Polevova. Svetlana. September 2011. The ultrastructure of fossil dispersed monosulcate pollen from the Early Cretaceous of Transbaikalia, Russia. Grana. en. 50. 3. 182–201. 10.1080/00173134.2011.611530. 0017-3134. 2011Grana..50..182Z .
2. Web site: Krasnyi Yar, Khilok River (Cretaceous of Russian Federation). Paleobiology Database.
3. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=58199 Khilok Formation