10:15 AM - 10:30 AM
*Takahiro WATANABE1, Norihiro HOSODA1, Noriyoshi TSUCHIYA1, Toshio NAKAMURA2, Shin-ichi YAMASAKI1, Fumiko NARA1 (1.Graduate School of Environmental Studies, Tohoku University, 2.Center for Chronological Research, Nagoya University)