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*Shun Chiyonobu
Institute of Geology and Paleontology, Graduate School of Science, Tohoku University
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Tokiyuki Sato
Institute of Applied Earth Sciences, Faculty of Engineering and Resource Science, Akita University
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Makoto Yamasaki
Institute of Applied Earth Sciences, Faculty of Engineering and Resource Science, Akita University
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Takato Saito
Research Institute, Palynosurvey Co. Ltd.