1. Department of Applied Chemistry
2. Faculty of Science and Technology
3. Keio University
4. Yokohama 223-8522
5. Japan
6. Japan Agency for Marine-Earth Science and Technology
7. Yokosuka 237-0061
8. Yokohama National University
9. Yokohama 240-8501
10. Alfred-Wegener-Institut Helmholtz Zentrum für Polar-und Meeresforschung
11. 27515 Bremerhaven
12. Germany
13. Department of Geology and Paleontology
14. National Museum of Nature and Science
15. Ibaraki 305-0005