Figure 5.
The cooling step observed between 2.5 and 3 Ma (as seen in the shift to more positive values of delta18O) marks a change toward greater instability of climate, as seen in increased fluctuations of delta18O values of planktonic foraminifers (Neogloboquadrina pachyderma, Globigerina bulloides) and benthic foraminifers (Cibicides spp.) sampled near the boundary between the South Atlantic and Southern oceans. From Hodell and Venz (1992).

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