*Akihiro Tanimoto¹, Makoto Okada¹ (1.Ibaraki University)

*Yuki Haneda¹, Riku Nakagawa^2,3, Hiroto Kajita², Masayuki Utsunomiya¹, Yusuke Suganuma⁴, Motohiro Hirabayashi⁴, Hiroyuki Matsuzaki⁵, Takeyasu Yamagata⁵, Daisuke Kuwano⁶, Yoshimi Kubota⁷, Makoto Okada⁸ (1.Geological Survey of Japan, AIST, 2.Hirosaki University, 3.Shizuoka Prefectural Government, 4.National Institute of Polar Research, 5.The University Museum, The University of Tokyo, 6.Kyoto University, 7.National Museum of Nature and Science, 8.Ibaraki University)

*Daisuke Kuwano¹, Nakagawa Riku^2,3, Hiroto Kajita², Yuki Haneda⁴, Masayuki Utsunomiya⁴, Yoshimi Kubota⁵, Yusuke Suganuma⁶, Makoto Okada⁷ (1.Kyoto University, 2.Hirosaki Univeristy, 3.Shizuoka Prefectural Government, 4.National Institute of Advanced Industrial Science and Technology, 5.National Museum of Nature and Science, 6.National Institute of Polar Research, 7.Ibaraki University)

*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)

*Daisuke Kuwano^1,2, Koji Kameo², Shota Sugizaki^2,3, Soki Hirota^2,4, Yoshimi Kubota⁵, Kanako Mantoku⁶, Masayuki Utsunomiya⁷, Makoto Okada⁸ (1.Kyoto University, 2.Chiba University, 3.Japan Petroleum Exploration Co., Ltd., 4.Ise Chemicals corporation, 5.National Museum of Nature and Science, 6.National Institute for Environmental Studies, 7.National Institute of Advanced Industrial Science and Technology, 8.Ibaraki University)

*Makoto Okada¹, Daiki Kotsuka², Takumi Konishi², Akihiro Tanimoto², Daiki Nagatomo², Ryoka Yuhara² (1.Department of Earth Sciences, Faculty of Natural Basic Science, Ibaraki University, 2.Graduate School of Engineering Sciences, Ibaraki University )