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Paleobiological attribution of part of microfossils from a section of South Ural is suggested on the basis of the actuapaleontologic conclusions drawn in forms and their morphologic series from Precambrian section of  the Baikal  folded area  and  the Anabar-Olenek  region. The  short  lithologic  characteristic of Riphean type section lasting more than one billion years is provided. The age of series and formations is corrected according  to  the  latest  isotope chronological data. The history of  studying of microfossils of Riphean stratotype is shown. Microfossil associations had been studied from the Zigazino-Komarov and Avzyan Formations of the Middle Riphean, and Zilmerdak, Inzer and Uk Formations of the Upper Riphean. Among new forms of  the Avzyan Formation, Octaedryxium Rud. had been described, which was known earlier from the Late Riphean. Small volume-preserving forms are identified as benthos of chemolithotrophic or sulfur bacterias. Rich microfossil association of the Upper Riphean includes various cyanobacteria and acritarchs. Of the latter, a new species Trachyhystrichosphaera Tim. et Herm. is interesting, as well as forms, identified as desmidian green algae. Some forms are found which in the Neoproterozoic of the South of Eastern Siberia are included into association of the microfossils compared to coenobic green algae. Volumepreserving Retiforma Mikh. and Bavlinella faveolata Schep. were  found, which were known earlier only from the Vendian. It is shown that the difference in the taxonomical content of the microbiotas is greatly influenced by a difference in sedimentation environments.

Microfossils of the Southern Ural riphean stratotype and late precambrian of Eastern Siberia (paleobiologic aspects)