*Takayuki Omori¹, Keitaro Yamada², Ikuko Kitaba², Takeshi Nakagawa² (1.The University Museum, The University of Tokyo, 2.Research Centre for Palaeoclimatology, Ritsumeikan University)

*Keitaro Yamada¹, Takayuki Omori², Ikuko Kitaba¹, Takeshi Nakagawa¹ (1.Research Organization of Science and Technology, Ritsumeikan University, 2.The University museum, The University of Tokyo)

*Kenta Suzuki¹, Masanobu Yamamoto^1,2, Brad Rosenheim³, Takayuki Omori⁴, Leonid Polyak⁵ (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.The University Museum, The University of Tokyo, 5.Bard Polar and Climate Research Center, Ohio State University)

*Kenta Suzuki¹, Masanobu Yamamoto^1,2, Brad Rosenheim³, Takayuki Omori⁴, Leonid Polyak⁵ (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.The University Museum, The University of Tokyo, 5.Bard Polar and Climate Research Center, Ohio State University)