The Bakhar Formation (Russian: Bakhar Svita) is a geological
formation
Formation may refer to:
Linguistics
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Mathematics and science
* Cave formation or speleothem, a secondar ...
in Mongolia whose strata date back to the
Aalenian to
Bathonian
In the geologic timescale the Bathonian is an age and stage of the Middle Jurassic. It lasted from approximately 168.3 Ma to around 166.1 Ma (million years ago). The Bathonian Age succeeds the Bajocian Age and precedes the Callovian Age.
Strat ...
stages of the
Middle Jurassic
The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relatively rare, but geological formations co ...
, comprising
claystone
Mudrocks are a class of fine-grained siliciclastic sedimentary rocks. The varying types of mudrocks include siltstone, claystone, mudstone, slate, and shale. Most of the particles of which the stone is composed are less than and are too sm ...
s deposited in a
lacustrine environment
Environment most often refers to:
__NOTOC__
* Natural environment, all living and non-living things occurring naturally
* Biophysical environment, the physical and biological factors along with their chemical interactions that affect an organism or ...
.
[Bakhar Formation]
at Fossilworks
Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database
The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...
.org
Fossil content
Insects; ''
Platyperla propera'',
[Sinitshenkova, 1987]
''
Ano da'', ''A. net'', ''A. nym'', ''
Blattula anuniversala'', ''B. bacharensis'', ''B. flamma'', ''B. mikro'', ''B. mini'', ''B. universala'', ''B. velika'', ''B. vulgara'', ''
Caloblattina vremeni'', ''
Dostavba pre'', ''
Hra disko'', ''H. bavi'', ''H. nie'', ''
Nuurcala cela'', ''
Okras sarko'', ''
Perlucipecta cosmopolitana'', ''
Polliciblattula analis'', ''P. tatosanerata'', ''P. vana'', ''
Praeblattella jurassica'', ''
Raphidiomima chimnata'', ''R. krajka'', ''
Rhipidoblattina bakharensis'', ''R. konserva'', ''R. sisnerahkab'', ''
Solemnia togokhudukhensis'', ''
Truhla vekov'',
[Vršanský, 2020] fish (
Palaeonisciformes
The Palaeonisciformes (Palaeoniscida) are an extinct order of early ray-finned fishes ( Actinopterygii). Palaeonisciformes ''sensu lato'' first appeared in the fossil record in the Late Silurian and last appeared in the Late Cretaceous. The na ...
) and
pterosaur
Pterosaurs (; from Greek ''pteron'' and ''sauros'', meaning "wing lizard") is an extinct clade of flying reptiles in the order, Pterosauria. They existed during most of the Mesozoic: from the Late Triassic to the end of the Cretaceous (228 to ...
remains of the family
Anurognathidae have been recovered from the formation.
[Bakhurina & Unwin, 1995][Barret et al., 2008] The formation has also provided many fossil flora in its
coal
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Coal is formed when dea ...
layers, known as the Tsagan-Ovoo Flora containing 32 megafossil plant taxa belonging to horsetails, ferns, cycadaleans, ginkgoaleans, leptostrobaleans, conifers and gymnosperms. Three new species were named; ''
Ginkgo badamgaravii'', ''
Pseudotorellia gobiense'' and ''
P. mongolica''.
[Kostina et al., 2015]
See also
*
List of pterosaur-bearing stratigraphic units
*
Balabansai Formation, contemporaneous fossiliferous formation of Central Asia
*
Itat Formation, contemporaneous fossiliferous formation of Russia
*
Ukureyskaya Formation
The Ukureyskaya Formation, also referred to as the Ukurey Formation is a geological formation in Zabaykalsky Krai, part of the Russian Far East. It is made up of Middle Jurassic and Late Jurassic layers. It covers large areas around Kulinda. The f ...
, contemporaneous fossiliferous formation of Russia
*
Tiaojishan Formation, contemporaneous fossiliferous formation of China
References
Bibliography
*
*
*
*
* {{cite LSA , last=Sinitshenkova , first=N.D , year=1987 , title=Istopicheskoe razvitie vesiyanok , journal=Akademiya Nauk SSSR, Trudy Paleontologicheskogo Instituta , volume=221 , pages=1–142
Geologic formations of Mongolia
Jurassic System of Asia
Jurassic Mongolia
Aalenian Stage
Bajocian Stage
Bathonian Stage
Shale formations
Coal formations
Coal in Mongolia
Lacustrine deposits
Paleontology in Mongolia