| Project/Area Number |
18K03817
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17050:Biogeosciences-related
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| Research Institution | Hokkaido University of Education |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 暁新世 / 貝類化石群 / 分類学 / 古生物地理学 / 貝類 / 分類 / 古生物地理 / 日本 / 古環境 / 古第三紀暁新世 |
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| Outline of Final Research Achievements |
To clarify the characteristics of Paleocene molluscan faunas in Japan, I investigated the following areas: the Hamatonbetsu area in northern Hokkaido, the Kon-Sen district in eastern Hokkaido, the Sukumo area in eastern Shikoku, and the Amakusa-Shimojima area in western Kyushu. As a result, some new species can be discriminated. It became clear that the molluscan fauna of the Okuutsunai Member of the Hakobuchi Formation in the Hamatonbetsu area, characterized by the abundant occurrence of glycymeridid bivalves, is a sole Paleocene shallow marine molluscan fauna in Japan. In addition, it became obvious that Paleocene deep sea molluscan assemblages between South Sakhalin and western Shikoku are characterized by protobranch bivalves as Acila (Truncacila) hokkaidoensis and apporhaid gastropods. It is suggested that the Paleocene molluscan faunal turnover had occurred before the Paleocene-Eocene Thermal Maximum (PETM) in the Northwestern Pacific.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の結果，これまで明らかではなかった北海道浜頓別地域の函淵層奥宇津内部層や根釧地区霧多布層・汐見層，高知県宿毛地域の百笑層の貝類化石群の群集組成が明らかとなったほか，いくつかの新種が確認できた。また，暁新世の深海性貝類化石群は南サハリンから四国西部まで同一の古生物地理区に属していたことが明らかとなった．さらに，汐見層の貝類化石群の研究を通じて，日本の暁新世の貝類化石群の組成の転換は暁新世-始新世境界の最温暖期（PETM）よりも前に起こっていたことが示唆された。
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