Cycladophora davisiana events in sediments of the subantarctic Atlantic Ocean

The relative abundances of C. davisiana and delta18O measurements of benthic and planktic foraminifera have been determined in two sediment cores. Oxygen isotope stratigraphy has been used to date the C. davisiana records and to assign SPECMAP ages to the C. davisiana events.

Comparisons with an existing calibration from the subantarctic Indian Ocean show, that the C. davisiana events 'b2, c1, c2, d, e1, e2, e3, f, h, i1 and i2' occur synchronous within the errors of the oxygen isotope stratigraphy in the Indian and the Atlantic sectors of the Southern Ocean. Larger deviations occur only for events 'b1' and 'g'. Furthermore, the long-term fluctuations in C. davisiana abundances have been studied in a sediment core covering the last 700 kyr.