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Expansion of the Cathaysian Oldland through the Ordovician-Silurian transition:Emerging evidence and possible dynamics

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Science China Earth Sciences 2010年第1期53卷 1-17页

作者： RONG JiaYu ZHAN RenBin XU HongGen HUANG Bing YU GuoHua State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Zhejiang Institute of Geological Survey Hangzhou 311203China

Located northwest of the Jiangshan-Shaoxing Fault Zone,western and northwestern Zhejiang and northeastern Jiangxi provinces experienced major changes in bio-and litho-facies and paleogeography through the Ordovician-Silurian transition (late Katian,Hirnantian,and early Rhuddanian),as manifested by stratigraphic,paleontologic and synecologic *** geographic units under consideration are South,Central,and North *** western margin of the South area was occupied by the Huaiyu Mountains,whereas the other two parts were covered by the Zhe-Gan Sea during late Katian (Late Ordovician) *** the early stage of the Changwu Formation deposition (late Katian),the sea was deepening northeastward,but with shallower conditions in the southwest and deeper conditions in the *** mid to late stages of Changwu Formation deposition (latest Katian),the sea became much shallower and the sea bottom was uplifted substantially,which occurred somewhat prior to the global *** the Hirnantian (latest Ordovician) and early Rhuddanian (earliest Silurian),the study region became a shallow bay under expansion of the Cathaysian *** occurred a major drop of sea level and great changes in benthic biota with the occurrence of many new immigrants through the Ordovician-Silurian transition,which are closely related to a unique regional *** Yangtze and Cathaysian blocks may have amalgamated within the South China Paleoplate during this interval to cause the continuous uplifting and northwestward expansion of the Cathaysian Oldland.

关键词： Cathaysian Oldland Jiang-Shao Fault Zone Ordovician-Silurian transition biostratigraphy synecology paleogeography

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Community Structure in the Amber Forest:Study of the Arthropod Syninclusia in the Rovno Amber(Late Eocene of Ukraine)

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Acta Geologica Sinica(English Edition) 2010年第4期84卷 954-958页

作者： Evgeny E.PERKOVSKY Alexandr P.RASNITSYN Anatoly P.VLASKIN Sergej P.RASNITSYN Schmalhausen Institute of Zoology National Academy of Sciences of Ukraine15 Kiev 01601Ukraine Palaeontological Institute Russian Academy of Sciences117997 MoscowRussia Natural History Museum London SW7 5BDUK E.I.Marcinovsky Institute of Medical Parasitology and Tropical Medicine Moscow 119435Russia

Arthropodan syuinclusions in the Late Eocene Rovno amber were examined using x^2 to reveal correlation of the component groups （some taxa of Diptera, ants, aphids, and mites） supposedly indicative of the biocoenotic relationships in the ancient amber forest. Three tightly correlated groups were identified, representing a putative aerial plankton guild （Chironomidae ＋ Ceratopogonidae） and two tree-trunk guilds, one of which （Dolichopodidae ＋ Germaraphis） is possibly connected to more open or/and more hygrophilous habitats than the other （Sciara zone Diptera ＋＂Acarus＂ rhombeus）. The ants were not linked with any of the above components.

关键词： syninclusion Rovno amber Eocene synecology amber forest biocoenosis Diptera Formicidae Germaraphis "Acarus" rhombeus

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