ИСТИНА

Monotaxon organogenic structures are composed with bryozoa, sporadically common in the Kazan era (P2kz) on the northeastern periphery of the Eastern European Platform among the polyfacial carbonate complex of medium Permian. They were formed on certain parts of the sea basin, often with "pre-biogerm formation" due to the intrusion of boreal sea waters. This led to the short-term flourishing of biocenosis and the formation of multi-scale bryozoa organogenic strucures. Later on, there was a shallowing and an evaporiteization against the background of a sharp and rapid depletion of the composition of biocenosis up to the complete disappearance of eukaryotes and the domination of prokaryotes.