Zaza Formation
| Zaza Formation Stratigraphic range: | |
|---|---|
| Type | Geological formation |
| Overlies | Paleozoic granite basement |
| Thickness | Around 80 metres at Baissa |
| Lithology | |
| Primary | Sandstone, siltstone, marl, and bituminous shale |
| Other | Conglomerate, limestone |
| Location | |
| Region | Buryatia |
| Country |  Russia |
The Zaza Formation is a geological formation located in Buryatia (Russia). It dates to the Lower Cretaceous period. It is Aptian in age and consists of sandstones, siltstones, marls and bituminous shales, deposited in a stratified lake. It is situated on a large granite plateau in the NE of Buryatia.[1] The formation is known for its numerous compression fossils of many varieties of insect found predominantly at the Baissa locality, located on the banks of the Vitim River.[2] Insects are found in multiple beds throughout the succession, predomiantly in the finer grained facies, the preservation of insect fossils is variable between beds, with good preservation in marl and poor preservation in shale beds.[1]
See also[]
References[]
- ^ a b Zherikhin, V.V., Mostovski, M.B., Vrsansky, P., Blagoderov, V.A. and Lukashevich, E.D. 1999. The unique Lower Cretaceous locality of Baissa and other contemporaneous insect-bearing sites in North and West Transbaikalia. Proceedings of the First Palaeoentomological Conference, Moscow, 1998. Bratislava: Amba Projects, pp. 185-192.
- ^ "Baissa (PIN collection 3064, bed 31) (Cretaceous of Russian Federation)". fossilworks.org. Retrieved 17 December 2021.
Further reading[]
- Vickers-Rich, Patricia; Rich, Thomas Hewett (1993). Wildlife of Gondwana. Reed. ISBN 0-7301-0315-3.
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- Geologic formations of Russia
- Lower Cretaceous Series of Asia
- Cretaceous Russia
- Aptian Stage
- Paleontology in Russia
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