The Bukachacha Formation is a

geological formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock expo ...

Zabaykalsky Krai Zabaykalsky Krai ( rus, Забайкальский край, r=Zabaikal'skii krai, p=zəbɐjˈkalʲskʲɪj kraj, lit. " Transbaikal krai"; bua, Yбэр Байгалай хизаар, Uber Baigalai Xizaar) is a federal subject of Russia (a krai ...

Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eigh ...

dating to the

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 Pr ...

(

Barremian The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ± 1.5 Ma ( million years ago) and 121.4 ± 1.0 Ma). It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is pre ...

). The

tuff Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock ...

aceous mudstones of the formation were deposited in a

lacustrine A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much larger ...

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 ...

Fossil content

The formation has provided fossil insects:Bukachacha
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cre ...

.org *

Coleoptera Beetles are insects that form the order Coleoptera (), in the superorder Endopterygota. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 400,000 describ ...

Coptoclavidae Coptoclavidae is an extinct family of aquatic beetles in the suborder Adephaga. The Coptoclavidae lived from the Late Triassic to the Early Cretaceous. Coptoclavidae is a member of the adephagan clade Dytiscoidea, which contains other aquatic b ...

*** '' Stygeonectes jurassicus''Ponomarenko, 1990 *

Trichoptera The caddisflies, or order Trichoptera, are a group of insects with aquatic larvae and terrestrial adults. There are approximately 14,500 described species, most of which can be divided into the suborders Integripalpia and Annulipalpia on the ...

Phryganeidae Phryganeidae is a family of giant caddisflies in the order Trichoptera. There are about 16 genera and at least 80 described species in Phryganeidae. The type genus for Phryganeidae is ''Phryganea ''Phryganea'' is a genus of giant casem ...

*** '' Proagrypnia sp.''Sukatsheva, 2016, p.401 * Ephemerida ** Hexagenitidae *** '' Ephemeropsis trisetalis''Sinitshenkova, 1990

References

Bibliography

* * * {{citation , first=N.D , last=Sinitshenkova , year=1990 , title=Mayflies. Ephemerida, in Pozdne-Mezozoyskie Nasekomye Vostochnogo Zabaykal'ya , journal=A. P. Rasnitsyn (Ed.), Akademiya Nauk SSSR, Trudy Paleontologicheskogo Instituta , volume=239 , pages=14–20 Geologic formations of Russia Lower Cretaceous Series of Asia Cretaceous Russia Barremian Stage Mudstone formations Tuff formations Lacustrine deposits Fossiliferous stratigraphic units of Asia Paleontology in Russia

Formations 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 ...

Fossil content

See also

References

Bibliography