Covariance Patterns of Foraminiferal δ18O: An Evaluation of Pliocene Ice Volume Changes Near 3.2 Million Years Ago

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Science  09 Nov 1984:
Vol. 226, Issue 4675, pp. 692-694
DOI: 10.1126/science.226.4675.692


Oxygen isotope data for a Pliocene interval from 3.6 to 2.8 million years ago show a mean increase (0.5 per mil) of benthic δ18O at about 3.2 million years ago, whereas planktic δ18O does not increase. This lack of covariance indicates that the event at 3.2 million years did not result in a permanent increase in the ice budget of either the Northern or the Southern Hemisphere.

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