BREEDEN III, Benjamin1, IZUMI, Kentaro2, KEMP, David B.3, MANABE, Makoto4, TAKAHASHI, Fumio5 and SAKATA, Chisako4, (1)Department of Geology & Geophysics, University of Utah, 115 S 1460 E, Salt Lake City, UT 84112, (2)Faculty & Graduate School of Education, Chiba University, 1-33 Yoyoi-chō, Inage-ku, Chiba, 263-8522, Japan, (3)State Key Laboratory of Biogeology and Environmental Geology and School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China, (4)National Museum of Nature and Science, 4 Chome-1-1 Amakubo, Tsukuba, 305-0005, Japan, (5)Mine City Museum of History and Folklore, Higashibun-279-1, Omine-chō, Mine, 759-2212, Japan