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Reishi Takashima
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Noritoshi Suzuki
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Toshio Koike
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Tsunemasa Saito
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Author's Organization:Institute of Geology and Paleontology,Graduate School of Science,Tohoku University Institute of Geology and Paleontology,Graduate School of Science,Tohoku University Department of Earth Science,Faculty of Education,Yokohama National University Institute of Geology and Paleontology,Graduate School of Science,Tohoku University