*Yukiko OHTOMO¹, Ryoichi TAMIYA (1. Yamagata University)

*Norihito KAWAMURA¹ (1. University of Hyogo)

*KIWAMU OKAMOTO¹ (1. Tokai University, School of Biological Sciences, Department of Marine Biology and Sciences)

*【ECS】masaya SAKAMOTO¹ (1. Kyushu Lutheran College)

*Goichiro URAMOTO¹, Riko Nakamura¹, Kota Asayama¹, Kazuya Iki², Osamu Tadai³, Yohei Hamada⁴, Wataru Tanikawa⁴, Takehiro Hirose⁴ (1. Kochi University, 2. Mihara suzuri inkstone Artisans' Guild, 3. Marine Works Japan, 4. JAMSTEC)

*Wataru Tanikawa¹, Hidekazu Tokuyama², Yoshichika Mochizuki², Shota Takagi³, Riko Nakamura², Osamu Tadai⁴, Tetsuya Yamamoto¹, Yasuo Kondo² (1. Japan Agency for Marine-Earth Science and Technology, 2. Kochi University, 3. Kochi Castle Museum of History, 4. Marine Works Japan Ltd.)

*Tohru SAKIYAMA¹, Nobuyoshi Kurokawa², Wataru Tanikawa³, Yukari Moriyama⁴, Hiroshi Kaibe⁵, Kimitoshi Tamura⁶ (1. Institute of Geo-history, Japan Geochronology Network , 2. Cultural Property Protection Council, Ikata Town, 3. Japan Agency for Marine-Earth Science and Technology, 4. Education Board of Ashiya City, 5. Sakai Plaza of Rikyu and Akiko, 6. Education Board of Tosashimizu City)

*Mutsuko INUI¹, Shoji NISHIMOTO², Ayako UMEMURA³, Tsutomu NAKAZAWA⁴ (1. Kokushikan University, 2. Aichi University, 3. Nagoya University Museum, 4. Geological Survey of Japan, AIST)

*Teiji MIKAMI¹, Michio KIJI² (1. Ryukoku Univ., 2. Ritsumeikan High School)

*Michio KIJI¹ (1. Ritsumeikan senior high school)