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We found emerged cluster of calcareous tubes of Pomatoleios kraussii on a very coarse boulder, 3.0 × 2.7 × 1.0 m in size and estimated to >7 ton, on beach at Iruma, Minami-izu, Shizuoka, Central Japan. The cluster is distributed at 0.8‒1.4 m above mean sea-level. Radiocarbon dating of the fossils indicates that the boulder was emplaced after AD 1950. Based on the occurrence of the fossils and disaster record of the 1974 Izu Peninsula earthquake, the boulder may be rolled by a storm surge associated with typhoon Tip at 1979. [ABSTRACT FROM AUTHOR]