Satomu FUJII¹, *Nobutatsu MOCHIZUKI², Takeshi HASEGAWA³, Makoto OKADA³, Hidetoshi SHIBUYA¹ (1.Department of Earth and Environmental Science, Kumamoto University, 2.Priority Organization for Innovation and Excellence, Kumamoto University, 3.Department of Earth Science, Faculty of Science, Ibaraki University)

*Yusuke SUGANUMA¹, Makoto OKADA², Kenji HORIE¹, Hiroshi KAIDEN¹, Mami TAKEHARA³, Ryoko SENDA⁴, Jun-ichi KIMURA⁴, Osamu KAZAOKA⁵ (1.National Institute of Polar Research, 2.Ibaraki University, 3.Kyushu University, 4.JAMSTEC, 5.Research Institute of Environmental Geology, Chiba)

*Makoto OKADA¹, Yusuke SUGANUMA², Toru MARUOKA¹, Yuki HANEDA¹, Osamu KAZAOKA³ (1.Ibaraki University, 2.National Institute of Polar Research, 3.Research Institute of Environmental Geology, Chiba Pref.)

*Masayuki HYODO¹, Kenta TAKASAKI², Hayato MATSUSHITA², Ikuko KITABA¹, Shigehiro KATOH³, Akihisa KITAMURA⁴, Makoto OKADA⁵ (1.Research Center for Inland Seas, Kobe University, 2.Department of Earth and Planetary Sciences, Kobe University, 3.Division of Natural History, Hyogo Museum of Nature and Human Activities, 4.Institute of Geosciences, Faculty of Science, Shizuoka University, 5.Department of Earth Sciences, Faculty of Science, Ibaraki University)

*Takeshi HASEGAWA¹, Manami SUGAYA¹, Makoto OKADA¹, Nobutatsu MOCHIZUKI², Satomu FUJII², Hidetoshi SHIBUYA² (1.Faculty of Science, Ibaraki University, 2.Kumamoto University)

*Osamu KAZAOKA¹, Makoto OKADA², Shun KAMEYAMA¹, Yusuke SUGANUMA³, Nobuyuki AIDA⁴, Masaaki MORISAKI¹, Atsushi KAGAWA¹, Hisao KUMAI⁵, Hisashi NIREI⁶ (1.Research Institute of Environmental Geology, Chiba, 2.Ibaraki University, 3.National Institute of Polar Research, 4.Shumei University, 5.Osaka City University, 6.Officer of IUGS-GEM)

*Manami SUGAYA¹, Masaaki OKUDA², Makoto OKADA¹ (1.Ibaraki University, 2.Natural History Museum and Institute of Chiba)

*Manami SUGAYA¹, Masaaki OKUDA², Makoto OKADA¹ (1.Ibaraki University, 2.Natural History Museum and Institute of Chiba)