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).
To 175 Figure 6
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