Kohtaro Ujiie¹, Kazuya Noro¹, Norio Shigematsu², Ake Fagereng³, Naoki Nishiyama¹, Haruna Masuyama¹, Christopher Tulley⁴, Yasushi Mori⁵ and Hiroyuki Kagi⁶, (1)University of Tsukuba, Tsukuba, Japan, (2)Geological Survey of Japan, Tsukuba Ibaraki, Japan, (3)Cardiff University, Earth and Ocean Sciences, Cardiff, CF24, United Kingdom, (4)Cardiff University, Cardiff, United Kingdom, (5)Kitakyushu Museum Natl & Human, Kitakyushu, Japan, (6)Univ Tokyo, Tokyo, Japan