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Nature 455, 652-656 (2 October 2008) | doi:10.1038/nature07337;
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Thresholds for Cenozoic bipolar glaciation
The long-standing view of Earth|[rsquo]|s Cenozoic glacial history calls for the first continental-scale glaciation of Antarctica in the earliest Oligocene epoch (|[sim]|33.6 million years ago), followed by the onset of northern-hemispheric glacial cycles in the late Pliocene epoch, about 31 million years later. The pivotal early Oligocene event is characterized by a rapid shift of 1.5 parts per thousand in deep-sea benthic oxygen-isotope values (Oi-1) within a few hundred thousand years, reflecting a combination of terrestrial ice growth and deep-sea cooling.
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