Kenta Suzuki², *Masanobu Yamamoto^1,2, Osamu Seki^2,3 (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Graduate School of Environmental Sceince, Hokkaido University, 3.Institute of Low Temperature Science, Hokkaido University)

*Hiromichi Sakurai¹, Masanobu Yamamoto¹, Osamu Seki², Takayuki Omori³, Tomonori Sato¹ (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Low Temperature Research Institute, Hokkaido University, 3.The University Museum, The University of Tokyo, Japan)

*Hitoshi Hasegawa¹, Hisao Ando², Nagayoshi Katsuta³, Yasushi Muraki⁴, Niiden Ichinnorov⁵, Masafumi Murayama⁶, Koshi Yamamoto⁷, Tohru Ohta⁸, Takashi Hasegawa⁹, Masanobu Yamamoto¹⁰, Noriko Hasebe¹¹, Ulrich Heimhofer¹², Masayuki Ikeda¹³, Shoji Nishimoto¹⁴, Koichi Yamaguchi¹⁵, Fumio Abe⁴, Ryuji Tada¹⁶ (1.Faculty of Science and Technology, Kochi University, 2.Department of Earth Sciences, Faculty of Science, Ibaraki University, 3.Faculty of Education, Gifu University, 4.Institute for Space-Earth Environmental Research, Nagoya University, 5.Institute of Paleontology and Geology, Mongolian Academy of Sciences, 6.Faculty of Agriculture and Marine Sciences, Kochi University, 7.Department of Earth and Environmental Studies, Nagoya University, 8.Faculty of Education and Integrated Arts and Sciences, Waseda University, 9.Faculty of Science, Kanazawa University, 10.Faculty of Environmental Earth Science, Hokkaido University, 11.Institute of Nature and Environmental Technology, Kanazawa University, 12.Institut für Geologie, Leibniz Universität Hannover, 13.Institute of Geoscience, Shizuoka University, 14.Nagoya City Science Museum, 15.Nagoya Municipal Industrial Research Institute, 16.Department of Earth and Planetary Science, the University of Tokyo)

*Michinobu Kuwae¹, Masanobu Yamamoto², Beppu Bay sediment core research group (1.Center for Marine Environmental Studies, Ehime university, 2.Faculty of Environmental Earth Science, Hokkaido University)

*Kenta Suzuki¹, Masanobu Yamamoto^1,2, Brad Rosenheim³, Takayuki Omori⁴, Leonid Polyak⁵, Seung-Il Nam⁶ (1.Graduate School of Environmental Science, Hokkaido University, 2.Faculty of Environmental Earth Science, Hokkaido University, 3.College of Marine Science, University of South Florida, 4.University Museum, University of Tokyo, 5.Byrd Polar and Climate Research Center, Ohio State University, 6.Korea Polar Research Institute)

*Masanobu Yamamoto¹, Minoru Ikehara², Naomi Harada³, Yusuke Suganuma⁴, Takuya Itaki⁵, Hirofumi Asahi⁶ (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Center for Advanced Core Research, Kochi University, 3.JAMSTEC, 4.National Polar Research Institute, 5.National Institute of Advanced Industrial Science and Technology, 6.Korean Polar Research Institute)

*Masanobu Yamamoto¹, Minoru Ikehara², Naomi Harada³, Yusuke Suganuma⁴, Takuya Itaki⁵, Hirofumi Asahi⁶ (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Center for Advanced Core Research, Kochi University, 3.JAMSTEC, 4.National Polar Research Institute, 5.National Institute of Advanced Industrial Science and Technology, 6.Korean Polar Research Institute)