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1992 Fiscal Year Final Research Report Summary

Appearance process of the Cenozoic cold-water molluscan assemblages in the Japanese Islands

Research Project

Project/Area Number 02640606
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Stratigraphy/Paleontology
Research InstitutionThe University of Tsukuba (1991-1992)
Tohoku University (1990)

Principal Investigator

OGASAWARA Kenshiro  Inst. Geosci. Univ. Tsukuba Professor, 地球科学系, 教授 (20110653)

Project Period (FY) 1990 – 1992
KeywordsCenozoic / Mollusca / Cold-water / Zoogeography / Subarctic / Cooling / Oyashio / Adaptation
Research Abstract

The purpose of this research is to make clear the appearance process of Cenozoic cold-water fauna in the Japanese Islands on the basis of shallow-marine molluscan records. Firstly, the definition of the cold-water realm from zoogeographic point of view has been studied based on modern marine zoogeographic studies in relation to various data of surface temperature. As the result, the relationship between the zoogeographic divisions and annual mean temperature of Northern Pacific can be divided into the Subarctic (less than 8゚C), Cool-temperate (14-9゚C), Mild-temperate (16-15゚C), Warm-temperate (20-18゚C) and so on, respectively. Secondly, comparative analysis and interpretations from paleomarine-climatical viewpoint on the Japanese Cenozoic molluscan assemblages have been done based on modern analogous method as referring the characteristic molluscan genera/species of the arctic/subarctic realms. Consequently, it can be concluded that l) the Oyashio-type cold-water mass has not been appeared in Northern Pacific during the Miocene, 2) shallow marine cold-water molluscs have first appeared at latest Plioecne to early Pleistocene time at southern Hokkaido, that are of the cool-temperate origin, and 3) Sea of Japan and Sea of Okhotsk might be addorded the important biotope (biotic places) for such adaptation as from the cool-temperate to subarctic marine conditions corresponding world-wide cooling event towards the Glacial age (Quaternary).

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] OGASAWARA,K: "Neogene paleogeography and marine-climate of the Japanese Islands on the basis of shallow-marine molluscs" Paleogeogr.,Paleodimatol.,Palcoecol.(1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小笠原 憲四郎: "「新生代化石生物温度計の試み:その論理と適用」その背景と課題" 化石(日本古生物学会邦文誌). (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] OGASAWARA,K: "Paleozoogeographic Significance of Mizuhopecten slodkewitschi Sinelnikova from the Miocene Shibiutan Formation, northern Hokkaido" Sci.Rep.Inst.Geosci.Univ.Tsukuba.Sec.B. 14. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] OGASAWARA,K: "Tropical molluscon association in the Middle Miocene marginal sea of the Japanese Islands:An example of molluscs from the Oyama Formation ,Tsuruoka city,North-east Honshu,Japan." Trans.Proc.Palaeont.Soc.Japan,N.S. No,167. 1224-1246 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ogasawara, K.: "Neogene paleogeography and marine-climate of the Japanese Islands on the basis of shallow-marine molluscs" Paleogeogr.,Paleoclimatl,Paleoecol.(1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogasawara, K.: "Paleozoogeographic significance of Mizuhopecten slodkewistchi Sinelnikova from the Miocene Shibiutan Formation, northern Hokkaido." Sci. Rep., Inst. Geosci., Univ. Tsukuba, Sec. B. v. 14. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogasawara, K.: "Tropical molluscan association in the Middle Miocene marginal sea of the Japanese Islands: An example of molluscs from the Oyama Formation, Tsuruoka City, Northeast Honshu, Japan." Trans. Proc. Palaeont. Soc. Japan, N. S.no. 167. 1224-1246 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogasawara, K.: "Neogene of the Yatsuo area, Toyama Prefecture." Guidebook for 5th CPNS and IGCP-245 Inter. Nat. Congress, Shizuoka. 1-25 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Okami, K.: "Geological age and sedimentary environment of the Iioka Formation distributed in eastern marginal part of the Tohoku Backbone range." Prof. Nakagawa, H.Commem.223-234 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogasawara, K.: "Neogene marine sequences and benthic foraminifers." Guidbook for field Excur. C, 4th Internat. Benthic Foram., Sendai. 1-17 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ogasawara, K.: "A new Miocene gastropod species co-occurred with Paleoparadoxia specimens from the Yanagawa Formation, Fukushima Prefecture, Northeast Honshu, Japan." Saito Ho-on Kai Mus. Nat. Hist., Res. Bull., no. 58. 25-30 (1990)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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