*Tatsuhiko Yamaguchi¹, Tomohiro Tsuji², Futoshi Nanayama^3,4, Toshimichi Nakanishi⁹, Michiharu Ikeda⁸, Yasuo Kondo⁵, Michiko Miwa⁶, Yohei Hamada⁷ (1.Nation. Mus. Nat. Sci., 2.Yamaguchi Univ., 3.AIST, 4.Kumamoto Univ., 5.Kochi Univ., 6.JAPEX, 7.JAMSTEC, 8.Shikoku Research Institute Inc, 9.Japan Atomic Energy Agency )

*Futoshi Nanayama^1,2, Tatsuhiko Yamaguchi³, Nakanishi Toshimichi⁴, Tomohiro Tsuji⁵, Michiharu Ikeda⁵, Kondo Yasuo⁶, Michiko Miwa⁷, Shinji Sugiyama⁸, Kazunari Kimura⁹ (1.Geological Survey of Japan, AIST, 2.CWMD, Kumamoto University, 3.National Museum of Nature and Science, 4.Japan Atomic Energy Agency, 5.Shikoku Research Institute Inc., 6.Kochi University, 7.JAPEX Research Center, 8.Paleo Environment Research Center, 9.Naiba Ehime Branch)