in Jurassic and Cretaceous Stratigraphy

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Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 dary there is noted a significant drop in sea level. At the same time, both in marine basins, and in terrestrial ecosystems in different regions of the Northern Hemisphere, there is noted a negative shift in the isotopic composition of organic and carbonate carbon, which is usually associated to the cooling and low content of СО2 in the atmosphere. This is also evidenced by numerous finds of glendonites in the Lower Bajocian of Siberia. Close down of Viking Corridor in the Aalenian-Early Bajocian resulted in limited ingress of Paleoatlantic waters to Arctic, 220 changing of water circulation system, cooling, changing in emigration and immigration directions and in relatively rapid restructuring of communities. At the same time, the eastern ecotone zone functioned in the normal for the Jurassic period mode. Acknowledgements: This job was supported by RFFI (Russian Foundation for Basic Research) (project № 09-05-00136) and RAS (Russian Academy of the Sciences), programs 15 and 17. Fig.1 Phases of development of benthos and nekton in Siberian Jurassic paleobasins and main abiotic events
Earth Science Frontiers, Vol. 17, Special Issue, Aug. 2010 ISSN 1005-2321 Key words: Jurassic events; Molluscs; Micro- fauna; Siberia References: Nielsen S.B., Clausen O.R., Trautnner S.P., et al. Basin evolution constrained by joint inversion of many wells. Geophys. Res. Abstract, 2003, 5: 08989. Nikitenko B.L., Mickey M.B. Foraminifera and ostracodes across the Pliensbachian-Toarcian boundary in the Arctic realm. Geol. Soc. London, Spec. Publ., 2004, 230: 137-173. Nikitenko B.L., Shurygin B.N. Lower Toarcian black shales and pliensbachian-Toarcian crisis of the biota of Siberian paleoseas. 1992 Proceeding International Conference on Arctic Margins, Anchorage, Alaska, Dep. Inter. Minerals Manag. Serv. Alasks outer Continen. Shelf Region< Anchorage, USA, 1994: 39-45. Shurygin B.N., Nikitenko B.L., Deviativ V.P., et al. Stratigraphy of oil and gas basins of Siberia. Jurassic system. Novosibirsk: Academic Pub. House “Geo”, 2000: 480pp (in Russian with English Summary). Shurygin B.N., Nikitenko B.L. Aalenian-baocian reorganization of benthos communities in connection with all-boreal variations of abiotic factors. Russian Foundation for Basic Research in Siberian Region. Abstracts, v.1. Irkutsk, RFBR, 2005: 83 (in Russia). Shurygin B.N. Lower and Middle Jurassic biogeo- graphy, facies and stratigraphy in Siberia based on bivalve mollusks. Novosibirsk, Academic Pub. House “Geo”, 2005: 154pp (in Russian with English abstract). Zakharov V.A., Shurygin B.N., Il’ina V.I., et al. Pliensbachian–Toarcian biotic turnover in North Siberia and the Arctic Region // Stratigraphy and Geological Correlation. 2006, 14,4: 399-417. 221
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