*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)

*Hideki Iwano^1,2, Sota Niki¹, Hisashi Asanuma³, Shuhei Sakata⁴, Yuji Orihashi⁵, Takafumi Hirata¹ (1.Geochemical Research Center, The University of Tokyo, 2.Kyoto Fission-Track Co., Ltd., 3.Graduate School of Human and Environmental Studies, Kyoto University , 4.Earthquake Research Institude, The University of Tokyo , 5.Graduate School of Earth and Environmental Sciences, Hirosaki University )