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Masanori Shimamoto
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Hirofumi Higashino
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Hideaki Suzuki
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Koichi Shimokawa
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Yuichiro Tanaka
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Author's Organization:Institute of Geology and Paleontology,Faculty of Science,Tohoku University Institute of Geology and Paleontology,Faculty of Science,Tohoku University Institute of Geology and Paleontology,Faculty of Science,Tohoku University Environmental Geology Department,Geological Survey of Japan Marine Geology Department,Geological Survey of Japan