11:45 AM - 12:00 PM
*Yasu'uchi Kubota1,2, Toru Takeshita3, Koshi Yagi4, Tetsumaru Itaya5 (1.Graduate School of Science, School of Science, Hokkaido University, 2.OYO corporation, 3.Hokkaido University, 4.Hiruzen Institute for Geology and Chronology, 5.Okayama University of Science)