Novokuznetsk, Russia
Novokuznetsk, Russia

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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.


Gutak J.M.,Kuzbass State Pedagogical Academy | Ruban D.A.,Southern Federal University
Cadernos do Laboratorio Xeoloxico de Laxe | Year: 2013

Catastrophes were common in the geologic past, but their distinction from other events is necessary. Besides magnitude (strength), scales of events are important in a solution of this task. Several examples, which involve Late Paleozoic and Quaternary megafoods, Hadean and Phanerozoic extraterrestrial impacts, and Phanerozoic mass extinctions, ensure that scaling by spatial extent and diversity of consequences facilitates tracing the boundary between catastrophes and "ordinary" events. This boundary, however, is dynamic and its position depends on our subjective needs. Considerations of the geologic past should not mix catastrophes of different scales. The event analysis helps to avoid such a pitfall, and, therefore, it should be preferred to neocatastrophism in modern geoscience.


Gutak J.M.,Kuzbass State Pedagogical Academy | Antonova V.A.,Kuzbass State Pedagogical Academy | Ruban D.A.,Southern Federal University
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2011

Devonian deposits of the Southeastern Mountainous Altay, a large region in Southern Siberia, contain abundant remains of terrestrial plants. A semi-quantitative analysis of this regional palaeobotanical record reveals how both the diversity (number of taxa) and richness (number of taxa with an account of their abundances) of floristic assemblages changed during the Emsian-early Famennian time interval. A total of 60 species, representing 42 genera, are known from 8 regional assemblages. Changes in diversity of species and genera occurred simultaneously. The number of taxa was high in the early Emsian, declined in the late Emsian, rose again in the Eifelian-middle Givetian, dropped in the late Givetian, reached the highest values in the early Frasnian, and experienced the greatest decline taking place in the late Frasnian-early Famennian. The standing diversity (number of taxa crossing the time boundaries) was maximal in the Middle Devonian. The dynamics of terrestrial plant richness was similar to that of diversity with an exception of middle Givetian decline in richness despite growth of diversity. The floras were dominated by pteridophytes. Propteridophytes were less abundant, and pinophytes were very rare. Propteridophyte extinctions were high in the middle Givetian, concurrent with a brief decline in pteridophytes. Some regional and global patterns of floral dynamics were similar. However, propteridophyte decline was not abrupt globally. The main abiotic driving factor influencing species richness and diversity appears to have been regional shoreline shifts. It does not appear that climate changes was important for regional changes in phytodiversity, although both regional and global phytodiversity was at its high during the Middle Devonian cooling phase. A comparison of palaeobotanical data from the Southeastern Mountainous Altay and Kazakhstan suggests palaeogeographic proximity and proves an idea of Altay-Mongolian terrane wandered between Gondwana, Kazakhstan, and Siberia. The early Emsian and the early Frasnian, when floras of the study region were diverse and rich, are characterized by the very high degree of similarity. Thus, interregional floral exchanges would facilitate plant radiations. © 2010 Elsevier B.V.


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.


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: 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.


Tolokonnikova Z.A.,Kuzbass State Pedagogical Academy
Paleontological Journal | Year: 2013

An assemblage of Viséan-Serpukhovian bryozoans from the vicinity of the village of Kodinka (Sverdlovsk Region, Middle Urals) is studied for the first time. This assemblage is represented by two new species, Primorella kodinkensis sp. nov. and Heloclema uralicum sp. nov.; already known species Heloclema magnificum Gor. and Nikiforopora concentrica (Nikif.); and three morphotypes Fistulamina sp., Penniretepora sp., and Polyporella sp. Some specific features in the distribution of bryozoans of the Middle Urals at the beginning of the Carboniferous are discussed. © 2013 Pleiades Publishing, Ltd.


Mesentseva O.P.,Kuzbass State Pedagogical Academy
Paleontological Journal | Year: 2013

The species and generic compositions of bryozoans of the order Cryptostomata from the Emsian Stage of the Salair Ridge are discussed. A new genus, Vadimella gen. nov., comprising V. optima sp. nov. (type species) and V. devonica sp. nov. (kitabicus Zone), as well as the species Niigaella formosa L. Nekhorosheva (serotinus Zone), which has for the first time been recorded on the Salair Ridge, are described. The generic diagnosis of Niigaella is supplemented. © 2013 Pleiades Publishing, Ltd.


The evolution of the Neotrematopora species is shown to trend in the direction of developing stronger colonies, implemented in different ways: through changes in the diameter of apertures and thickness of walls of autozooecia, changes in the location and number of diaphragms, number of acanthozooecia and mesozooecia, and the degree to which the latter are filled. An increased development of some structural elements of the colony was compensated for by a decrease in the role of others. Based on the general direction of evolution in the genus Neotrematopora and the succession of its species changing each other in time, several phylogenetic lines in the development of the Early Devonian-Early Givetian Neotrematopora species in the Altai-Sayan folded region are outlined. During the Middle Emsian transgression the species of the Salair paleobasin invaded Gornyi Altai, and those of the Gornyi Altai invaded the Salair. New species from the Emsian (N. spinula sp. nov.) and Eifelian (N. alveolata sp. nov., N. ariadnae sp. nov.) stages of the Salair Ridge and from the Emsian Stage (N. rudnoaltaica sp. nov.) of Rudnyi Altai are described. © 2011 Pleiades Publishing, Ltd.

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