1. National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
2. Department of Polar Science, The Graduate University for Advanced Studies (SOKENDAI), Midori-cho 10-3, Tachikawa, Tokyo 190-8518, Japan
3. Department of Earth Sciences, Ibaraki University, 2-2-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
4. Department of Earth Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
5. Department of Earth Sciences, Chiba University, 1-33 Yayoi, Inage, Chiba, Chiba 263-8522, Japan
6. Geological Survey of Japan, AIST, Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
7. Interdisciplinary Graduate School of Science and Engineering, Shimane University, Nishikawatsucho 1060, Matsue, Shimane 690-8504, Japan
8. Faculty and Graduate School of Education, Chiba University, 1-33 Yayoi-cho, Inage, Chiba, Chiba 263-8522, Japan
9. Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan
10. Institute for Rural Engineering, NARO, 2-1-6 Kannondai, Tsukuba, Ibaraki 305-8609, Japan
11. Department of Environmental Sciences, Tokyo Gakugei University, 4-1-1 Nukuikita, Koganei, Tokyo 184-8501, Japan
12. Natural History Museum and Institute, Chiba, 955-2 Aoba-cho, Chuo, Chiba 260-8682, Japan
13. Lake Biwa Museum, 1019 Oroshimo-cho, Kusatsu 525-0001, Japan
14. CEREGE UM34, Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, 13545 Aix en Provence, France
15. Institute of Education, Shinshu University, 6-ro Nishinagano, Nagano 380-8544, Japan