NDLI: New Riphean microbiotas of the Billyakh Group, the north Anabar region (Fomich River basin): To Riphean biostratigraphy of the Siberian platform

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Stratigraphy and Geological Correlation : Volume 14

New Riphean microbiotas of the Billyakh Group, the north Anabar region (Fomich River basin): To Riphean biostratigraphy of the Siberian platform

Content Provider	Springer Nature Link
Author	Sergeev, V. N. Vorob’eva, N. G. Petrov, P. Yu.
Copyright Year	2007
Abstract	Excellently preserved organic-walled and silicified microfossils are first found in the Lower Riphean Ust-Il’ya and Kotuikan formations of the Billyakh Group in the northern slope of the Anabar Uplift (the Fomich River basin). Similar assemblages were previously known only from sections located southward in the Kotuikan River basin, and taxonomic composition of organic-walled microbiotas from the Ust-Il’ya and Kotuikan formations became a corner stone in competitive microphytological models that are based on different approaches. In their composition and general appearance, microbiotas from the Kotuikan and Ust-Il’ya formations in the Fomich River basin are similar to microbiotas reported from the Kotuikan River basin, although northern sections of the above formations characterize deeper sedimentation settings than in localities known before. The Ust-Il’ya and Kotuikan assemblages of organic-walled microfossils include sphaeromorphic Chuaria circularis and Leiosphaeridia, two-layer vesicles the genus Simia, filamentous Plicatidium and Taenitrichoides, and some others. The silicified microbiota from the lower Kotuikan Subformation is largely composed of akinetes of Anabaena-like cyanobacteria Archaeoellipsoides, spherical Myxococcoides grandis, and short trichomes Filiconstrictosus and Orculiphycus representing initial germination stages of Anabaena-like cyanobacterial spores. Acanthomorphic acritarchs known from lithology-similar Lower and Middle Riphean (Mesoproterozoic) formations of Australia and China have not been observed in the Ust-Il’ya and Kotuikan microbiotas, which are probably of older age. The found microbiotas outline substantially wider distribution area of organic-walled and silicified microfossils, supplement microphytological characteristics of Riphean sediments in the Anabar Uplift, provide information on taxonomic composition of microbiotas from a wider spectrum of facies, and specify relationships between Early and Middle Riphean assemblages of microorganisms from different continents.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	08695938
Journal	Stratigraphy and Geological Correlation
Volume Number	15
Issue Number	1
e-ISSN	15556263
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2007-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	microfossils cyanobacteria prokaryotes eukaryotic phytoplankton acritarchs Riphean Anabar Uplift Historical Geology Structural Geology Geophysics/Geodesy Sedimentology Archaeology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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