Oxygen isotope analysis of two species of planktonic Foraminifera in deep-sea core RC17–69 reveals a discrepancy of more than 8 cm in the depth of Termination II within the core, indicating a stratigraphic discrepancy of about 4,500 yr. A numerical model of bioturbation, which incorporates variations in relative abundances of species, is used to explain this discrepancy. Model results suggest that variations in species abundance contributes to stratigraphic uncertainty and therefore should be considered in stratigraphic interpretation of the oxygen isotope record.

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