*Akito Nakamura¹, Hitoshi Hasegawa¹, Aki Sakuma², Minoru Ikehara¹, Tomoyo Okumura¹, Chuan-Chou Shen³, Niiden Ichinnorov⁴, Dawadorj Davaasuren⁵, Tsuyoshi Ishikawa⁶, Yoshiro Nishio¹, Asuka Yamaguchi², Trishit Ruj⁷, Goro Komatsu⁸ (1.Kochi University, 2.University of Tokyo, 3.National Taiwan University, 4.Paleontological Institute, Mongolia, 5.Mongolian National University, 6.JAMSTEC, 7.Okayama University, 8.Università d’Annunzio)