1. Department of Anthropology, National Museum of Nature and Science, Tsukuba City, Ibaraki 305-0005, Japan.
2. Laboratory of Physical Anthropology, Ochanomizu University, Bunkyo-ku, Tokyo 112-8610, Japan.
3. Kyoto Fission-Track Corporation, Ltd., Omiya, Kita-ku, Kyoto 603-8832, Japan.
4. Earthquake Research Institute, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
5. Geochemical Research Center, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
6. Centre for Geological Survey, Bandung 40122, Indonesia.
7. Institute of Education, Shinshu University, Nagano City, Nagano 380-8544, Japan.
8. Research Center for Inland Seas, Kobe University, Nada-ku, Kobe 657-8501, Japan.
9. Department of Planetology, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan.
10. Research Centre for Palaeoclimatology, Ritsumeikan University, Kusatsu City, Shiga 525-8577, Japan.
11. Institute of Geosciences, University of Potsdam, 14476 Golm, Germany.