Geologicheskii Vestnik

A summary history of the study of the Early Permian bryozoans of the Southern Cis-Urals is considered. The taxonomic composition of bryozoans from the Lower Permian deposits of the Sterlitamak shikhans (Toratau, Kushtau, Yuraktau and the Shakhtau quarry) has been clarified in result of the processing of new collections and the revision of museum collections. It is represented 78 species 23 genera, most of which belong to the order Fenestrata. Reticulate colonies of fenestrate bryozoans are of various shapes: laminate, fan-shaped, pinnate, lyre-shaped, spiral. They are formed by branches with two or more rows of autozooecia joined by dissepiments or anastomoses. Bryozoans performed the role of accessory frame-builders in the Early Permian reefs. Their colonies served for consolidation of reef bodies, precipitation of carbonate matter, and accumulation of sediment. The bryozoan associations of shikhans are unique. The first time new taxa have been established here: 19 species from 13 genera and the genus Trataucladia Morozova, 1992. In the systematic composition of the Early Permian bryozoans of the Southern Cis-Urals, there are genera common to bryozoan fauna of the Tethyan and boreal regions.

bryozoans, Shakhtau, Toratau, Kushtau, Yuraktau, system, reef, Permian

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