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HISATAKE OKADA
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MASAHARU YAMADA
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HIROMI MATSUOKA
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TAKASHI MUROTA
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TATSUO ISOBE
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Author's Organization:Department of Earth Sciences,Faculty of Science,Yamagata University Department of Earth Sciences,Faculty of Science,Yamagata University Department of Earth Sciences,Faculty of Science,Yamagata University Institute of Geology and Paleontology,Faculty of Science,Tohoku University Hitachi Software Engineering Co.,