*Reishi Takashima¹, Haruka Kusakawa², Yuji Orihashi³, Hiroshi Nishi¹ (1.Tohoku University, 2.Chichibu Taiheiyo Cement Co. Ltd. , 3.Hirosaki University)

*Azumi Kuroyanagi¹, Takashi Toyofuku², Yukiko Nagai², Katsunori Kimoto², Hiroshi Nishi¹, Reishi Takashima¹, Hodaka Kawahata³ (1.The Center for Academic Resources and Archives, Tohoku University, 2.JAMSTEC, 3.Atmosphere and Ocean Research Institute, The university of Tokyo)

*Hiroshi Nishi¹, Reishi Takashima¹, Keiichi Hayashi², Kuwabara Sato², Yuji Orihashi³, Toshiro Yamanaka⁴ (1.The Center for Academic Resources and Archives, The Tohoku Museum Tohoku University, 2.Geological Survey of Hokkaido, 3.Hirosaki University, 4.Tokyo University of Marine Science and Technology)

*Masashi A. Ikeda¹, Ken Sawada², Takuto Ando³, Hideto Nakamura⁴, Reishi Takashima⁵, Hiroshi Nishi⁵ (1.Graduate School of Science, Hokkaido University, 2.Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University, 3.Estuary Research Center, Shimane University, 4.Faculty of Science, Osaka City University, 5.The Center for Academic Resources and Archives, The Tohoku University Museum, Tohoku University)