*Jenielyn PADRONES¹、Akira IMAI²、Ryohei TAKAHASHI²、Jillian aira GABO³、Kenichiro TANI⁴ (1.Graduate School of Engineering and Resource Sciences, Akita University, Japan、2.Faculty of International Resource Sciences, Akita University, Japan、3.Department of Earth Resources Engineering, Kyushu University, Japan、4.Department of Geology and Paleontology, National Museum of Nature and Science, Japan)