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. The formation is known for its numerous compression fossils of many varieties of insect found predominantly at the Baissa locality. 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.
Stratigraphic range: Aptian
|Overlies||Paleozoic granite basement|
|Thickness||Around 80 metres at Baissa|
|Primary||Sandstone, siltstone, marl, and bituminous shale|
- 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 2020-01-26.
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