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*Hiroyoshi Arai
Department of Earth Sciences, School of Education, Waseda Univrsity
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Atsushi Miyashita
Seikei High School
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Hideo Takagi
Department of Earth Sciences, Faculty of Education and Integrated Arts and Sciences, Waseda University
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Koshi Yagi
Hiruzen Institute for Geology & Chronology
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Tetsumaru Itaya
Research Institute of Natural Sciences, Okayama University of Science