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1992 Fiscal Year Final Research Report Summary

Vicissitudes of ostracode assemblages and mechanisms involved

Research Project

Project/Area Number 03640650
Research Category

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

Allocation TypeSingle-year Grants
Research Field Stratigraphy/Paleontology
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

ISHIZAKI Kunihiro  東北大学, 理学部, 助教授 (90004316)

Project Period (FY) 1991 – 1992
Keywordsostracodes / paleoenvironment / faunal analysis / Cenozoic / Miocene / Pleistocene / Cretaceous / heteronomy of species
Research Abstract

Fossil ostracodes from the Cretaceous of Hokkaido were published in two papers proving the position of the Japanese Islands in relative to Tethys at the time and hererochroneity of ostracode faunas between Japan and Europe. Analysis of ostracode fauna from the Pleistocene Omma Formation distributed in and around Kanazawa City disclosed a prominent spike of Kuroshio flowing into the Japan Sea at 1.2 Ma, and distinct fluctuations of water conditions in a cycle of 0.12 to 0.09 My (Alcheringa, in press).
Afterward, I concentrated in collecting fossils ostracodes from the Moniwa Formation, one of the Neogene distributed in and around Sendai City, to enable work supplementary to the report in 1966. Ostracode faunas from the Tsunaki Formation distributed near the southern border of Sendai City,were found containing the form which has been reported to date as Cornucoquimba moniwensis from the Pleistocene in Northeast Japan, together with Cornucoquimba moniwensis (s.s.), both being morphologically separated clearly by their carapace ornamentation. The dimorphism invoked at this time is shown subject to an increasing warming toward the end of Miocene time, leading their habitats extended to shallower waters, where a new form was established to linger on, at least, in Pleistocene shallow sea. With respect to the Cretaceous, the genus Krithe was found first appearing from the lowest part of the Hakobuchi Group (Campanian). This occurrence, the oldest record in Japan, may represent some changes in ostracode faunas to allow the introduction of a new element of ostracode faunas, offering us one of the very attractive subjects of our study.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 石崎 国煕: "Japan in early Cenomanian and Campanian Times relative to Tethys and Arctic waters -ostracode implications-." Saito Ho-on Kai Spec. Publ.3. 177-189 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石崎 国煕: "Campanian plaanktonic foraminifers and ostracodes from Hobetsu, Hokkaido, northern Jyapan.Part 2. Ostracodes." Centenary of Japanese Micropaleontology, eds. by K. Ishizaki and T. Saito, Terra Sci. Publ. Co.327-333 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石崎 国煕: "A Cobb Mountain spike of the Kuroshio Current detected by Ostracoda in the lower Omma Formation (Pleistocene), Kanazawa City, central Japan." Alcheringa.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石崎 国煕: "Late Miocene ostracodes from Sendai area, northern Japan -paleoclimatic implications-." Proc. Palaeont. Soc. Japan, N.S.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石崎 国煕: "Lata Cenozoic ostracodes on the Sea of Japan coast in central Japan." Proc.2nd European Ostracodologists' Meeting.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石崎 国煕: "Cretaceous and Paleogene ostracodes from Hokkaido, northern Japan." Proc. Palaeont. Soc. Japan, N.S.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] ISHIZAKI, Kunihiro and KAIHO, Kunio: "Japan in early Cenomanian and Campanian times relative to Tethys and Arctic waters -ostracode implications-." Saito Ho-on Kai Spec. Publ.v.3. 177-189 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] ISHIZAKI, Kunihiro,: "Campanian planktonic foraminifers and ostracodes from Hobetsu, Hokkaido, northern Japan. Part 2. Ostracodes." Centenary of Japanese Micropaleontology, eds. by K. Ishizaki and T. Saito, Terra Sci. Publ. Co.327-333 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] ISHIZAKI, Kunihiro,: "A Cobb Mountain spike of the Kuroshio Current detected by Ostracoda in the lower Omma Formation (Pleistocene), Kanazawa City, central Japan." Alcheringa.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] ISHIZAKI, Kunihiro,: "Late Miocene ostracodes from Sendai area, northern Japan -paleo-climatic implications-." Proc. Palaeont. Soc. Japan, N. S.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] ISHIZAKI, Kunihiro,: "Late Cenozoic ostracodes on the Sea of Japan coast in central Japan." Proc. 2nd European Ostracodologists' Meeting.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] ISHIZAKI, Kunihiro,: "Cretaceous and Paleogene ostracodes from Hokkaido, northern Japan." Proc. Palaeont. Soc. Japan, N. S.

    • 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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