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Soichi Osozawa
Department of Earth Sciences, Graduate School of Science, Tohoku University
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Toru Takeshita
Department of Natural History Sciences, Graduate School of Sciences, Hokkaido University
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Koshi Yagi
Hiruzen Institute for Geology & Chronology Co. Ltd.
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Kazuhiko Ishii
Department of Physical Science, Graduate School of Sceiences, Osaka Prefecture University