The Khilok Formation is an
Early Cretaceous
The Early Cretaceous ( geochronological name) or the Lower Cretaceous (chronostratigraphic name), is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 145 Ma to 100.5 Ma.
Geology
Pro ...
geologic
formation
Formation may refer to:
Linguistics
* Back-formation, the process of creating a new lexeme by removing or affixes
* Word formation, the creation of a new word by adding affixes
Mathematics and science
* Cave formation or speleothem, a secondary ...
in
Buryatia
Buryatia, officially the Republic of Buryatia (russian: Республика Бурятия, r=Respublika Buryatiya, p=rʲɪsˈpublʲɪkə bʊˈrʲætʲɪjə; bua, Буряад Улас, Buryaad Ulas, , mn, Буриад Улс, Buriad Uls), is ...
,
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
The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ago), a ...
. 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
''Kirgizemys'' is an extinct genus of turtle from Early Cretaceous of China, South Korea, Mongolia, Russia and Kyrgyzstan
Kyrgyzstan,, pronounced or the Kyrgyz Republic, is a landlocked country in Central Asia. Kyrgyzstan is bordered b ...
''.
Fossil content
The following fossils were reported from the formation:
[Khilok Formation]
/ref>
;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
The Murtoi Formation is a geologic formation in vicinity of Lake Gusinoye in Russia. It was deposited in the late Barremian to the mid Aptian of the Early Cretaceous. Paleofauna
*'' Kirgizemys dmitrievi''
*'' Tengrisaurus starkovi''
*'' Khurendu ...
References
Geologic formations of Russia
Lower Cretaceous Series of Asia
Cretaceous Russia
Aptian Stage
Conglomerate formations
Sandstone formations
Paleontology in Russia
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