1. Margolis, S. V., and Glasby, G. P., Bull geol. Soc. Am., 84, 3601–3609 (1973).
2. Fewkes, R. H., in Papers on the Origin and Distribution of Manganese Nodules in the Pacific and Prospects for Exploration (edit. by Morgenstein, M.), 21–29 (Hawaii Inst. Geophys., Honolulu, 1973).
3. Woo, C. C., ibid., 165–169 (1973).
4. Greenslate, J. L., Nature, 249, 181–183 (1974); Science, 186, 529–531 (1974).
5. Harada, K., Proc. Kansai Br., Geol. Soc. Japan, 76, 10 (in Japanese, 1974).