Mon. May 27, 2019 12:00 AM - 12:00 AM
*Mutsumi Iizuka1, Osamu Seki1, Takuya Itaki2, Tomohisa Irino1, Minoru Ikehara4, Saiko Sugisaki2, Masanobu Yamamoto1, Keiji Horikawa5, Yuusuke Suganuma3 (1.Hokkaido university, 2.Geological Survey of Japan, 3.National Institute of Polar Research , 4.Center for Advanced Marine Core Research, Kochi University, 5.University of Toyama)