9:15 AM - 9:30 AM
*Masaaki Okuda1, Yuki Haneda2, Yusuke Suganuma3, Makoto Okada4 (1.Natural History Museum and Institute, Chiba, 2.Geological Survey of Japan, AIST, 3.National Institute of Polar Research, 4.Department of Earth Sciences, College of Science, Ibaraki University)