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The bases of the colonies, which were separated from the upper living parts by algal growth, were 14C dated by AMS in the Leibnitz Laboratory in Kiel. Precision of Dating came to  30 years. The stratigraphy obtained from 14C dating was confirmed by the strong correspondence of the present proxy time series with a continuous 800-year coral skeletal chronology from Bermuda, presented by P�tzold et al. 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