Six new stromatolitic microbiotas from the Proterozoic of the Soviet Union |
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| Authors: | JW Schopf TA Dolnik IN Krylov CV Mendelson BB Nazarov AV Nyberg YuK Sovietov MS Yakshin |
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| Institution: | 1. Department of Geology, University of California at Los Angeles (UCLA), Los Angeles, Calif. 90024 U.S.A.;2. Irkutsk Geological Administration (IGU), Eastern-Siberian Scientific Research Institute of Geology, Geophysics and Mineral Resources, Irkutsk U.S.S.R.;3. Geological Institute, Academy of Sciences USSR (GIN), Moscow U.S.S.R.;4. Institute of Geology and Geophysics, Siberian Branch, Academy of Sciences USSR (IGG), Novosibirsk U.S.S.R. |
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| Abstract: | Diverse assemblages of cellularly preserved Precambrian microorganisms have been discovered in cherty stromatolitic sediments from six formations in the Soviet Union: Sukhotungusin Fm. (Middle Riphean, Siberia); Valukhtin Fm. (Middle Riphean, Siberia); Shorikha Fm. (Upper Riphean, Siberia); Minyar Fm. (Upper Riphean, Bashkiria); Olkhin Fm. (Upper Riphean, Siberia); and Chichkan Fm. (Vendian, Kazakstan). These cyanophyte-dominated microbial communities, occurring in both stratiform (cf. Stratifera) and columnar stromatolitic deposits (Baicalia hirta and Conophyton gaubitza), are the first stromatolite-building microbiotas to be reported from the Soviet Union; collectively they comprise more than one-fifth of all such Precambrian assemblages now known. |
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