Abstract
According to successive appearance of subfossil diatom, ebridian and silicoflagellate remains found in three sediment cores, levels of dissolution of biogenic opal are determined. It is suggested that the successive entry levels of siliceous organisms could reflect the oxygen history of the basin. On the basis of the better preserved coccolithophorid remains and an absolute time scale provided by excess 210Pb profiles, changes in primary productivity are discussed.
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