1. Office for Graduate School of Education, Graduate School of Science; Kyushu University; Fukuoka 819-0395 Japan
2. Hazama Ando Corporation; Tokyo 107-8658 Japan
3. Institute of Lowland and Marine Research; Saga University; Saga 840-8502 Japan
4. Department of Earth Resources Engineering; Graduate School of Engineering, Kyushu University; Fukuoka 819-0395 Japan
5. Kyoto Fission-Track Co. Ltd.; Kyoto 603-8832 Japan
6. National Institute of Polar Research; Tokyo 190-8518 Japan
7. Department of Polar Science, School of Multidisciplinary Sciences; The Graduate University for Advanced Studies (SOKENDAI); Tokyo 190-8518 Japan
8. Hiruzen Institute for Geology and Chronology; Okayama 703-8252 Japan