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Tolokonnikova Z.,Kuzbass State Pedagogical Academy | Ernst A.,University of Kiel
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2010

Bryozoans were widely distributed in marine habitats of the Famennian (Late Devonian) worldwide. This time interval was marked by gradual change in taxonomic composition of bryozoan faunas, which were insignificantly affected by global events (Upper Kellwasser, Handerberg). Distribution of bryozoan faunas was controlled by intrinsic factors (macroevolution) as well as extrinsic factors (eustasy, plate tectonic and volcanic activity). Palaeobiogeographic analysis of bryozoan associations reveals closest similarities between Tian Shan and Kazakhstan during the early to middle Famennian and between the Altay-Sayan Fold Belt, Transbaikalia and Mongolia during the late Famennian. Migration patterns of bryozoan faunas during the Famennian are reconstructed, showing main dispersions from the marine basins of Northern China to Kazakhstan and western offshoots of Tian Shan, and then to other areas. Biostratigraphic markers based on bryozoan taxa are established for each substage (lower, middle and upper Famennian) within relevant regions. © 2010 Elsevier B.V.


Nine bryozoan species are described from the Jurginskaya Formation (Famennian, Late Devonian) from Western Siberia, Russia, namely: Leptotrypella pojarkavi Orlovski, 1961, Khombopora subtilis Nekhoroshev, 1977, Klaucena lalolamina Yang, Hu, Xia, 1988, Eofistulotrypafamennensis sp. n., Atactotoechus cellatus sp. n., Nikijbropora jurgensis sp. n., Eridotrypella tyzhnovi sp. n., Mediapora elegans sp. n., and Klaucena gracilis sp. n. The studied assemblage shows palaeogeographical affinity with Kazakhstan, Kirgizia, Transcaucasia, China, and the United States of America.


Tolokonnikova Z.A.,Kuzbass State Pedagogical Academy
Paleontological Journal | Year: 2010

New bryozoans Saffordotaxis altaicus sp. nov. from the Givetian Stage (Middle Devonian) and Cyphotrypa olgae sp. nov. and Crustopora aliena sp. nov. from the Famennian Stage (Upper Devonian) are described from the Devonian of Gorny Altai. © 2010 Pleiades Publishing, Ltd.


Tolokonnikova Z.A.,Kuzbass State Pedagogical Academy
Paleontological Journal | Year: 2012

Bryozoans from the Mitikha Formation (Lower Famennian, Upper Devonian) in the Kuznetsk depression are described for the first time. This bryozoan assemblage comprises both the well-known species Leioclema numerosum Moroz., L. ramosum Nekh., and Nicklesopora graciosa Troiz. and new taxa: L. kusmense sp. nov. and Megacanthopora glubokaensis sp. nov. The bryozoan assemblage contains some species common with the Famennian bryozoan assemblage of Kazakhstan. © 2012 Pleiades Publishing, Ltd.


Tolokonnikova Z.A.,Kuzbass State Pedagogical Academy
Stratigraphy and Geological Correlation | Year: 2012

The analysis of characteristic bryozoan assemblages from Upper Devonian sections of the western Altai-Sayany region made it possible to define the following biostratigraphic units: lower Frasnian Leioclema vassinense, upper Frasnian Petalotrypa bifoliata, basal Famennian Leioclema numerosum, upper lower Famennian Megacanthopora glubokaensis, upper middle Famennian Eridocampylus striatum-Atactotoechus cellatus, and upper Famennian Monotrypa carbonica-Pseudobatostomella longipora beds. Six bryozoans species from type Frasnian assemblages of the western Altai-Sayany folded region are also recorded in the Nakhichevan Republic (Transcaucasia region) and Kazakhstan, while 11 Famennian species from the study region are known in Mongolia, the eastern Transbaikal region, Kazakhstan, China, and the South Urals. © 2012 Pleiades Publishing, Ltd.

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