*Taiga Tomaru¹, Reishi Takashima², Yuji Orihashi³, Toshiro Yamanaka⁴, Hisao Ando⁵, Yoshihiro Asahara⁶, Hiroshi Nishi⁷, Azumi Kuroyanagi² (1.Department of Earth Science, Graduate School of Science, Tohoku University, 2.The Center for Academic Resources and Archives Tohoku University Museum , 3.Global Environment and Disaster Prevention Sciences, Graduate School of Science and Technology, Hirosaki University, 4. School of Marine Resource and Environment, Tokyo University of Marine Science and Technology, 5.Department of Earth Science, Graduate School of Science and Engineering, Ibaraki University, 6.Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, 7.Institute of Dinosaur Research , Fukui Prefectural University)

*Haruka Katada¹, Hidekazu Yoshida², Tatsuo Oji², Yoshihiro Asahara¹, Masayo Minami³, Yui Kouketsu¹ (1.Graduate School of Environmental Studies, Nagoya University, 2.Nagoya University Museum, 3.Division for Chronological Research, Institute for Space–Earth Environmental Research, Nagoya University)

*li WENSHUAI¹, Yoshio Takahashi¹, Akira Usui², Ryoichi Nakada³, Teruhiko Kashiwabara⁴, Hajime Obata⁵, Naoya Kanna⁵, Yoshihiro Asahara⁶, Hirofumi Tazoe⁷, Masato Tanaka¹ (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan. , 2.Center for Advanced Marine Core Research, Kochi University, Kochi, Japan. , 3.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kochi, Japan. , 4.Submarine Resources Research Center (SRRC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan. , 5.Atmosphere and Ocean Research Institute, The University of Tokyo, Japan. , 6.Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan. , 7. Institute of Radiation Emergency Medicine, Hirosaki University, Honcho, Hirosaki, Aomori, Japan)