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When the world turned cold

As massive ice sheets grew on Antarctica during the first major glaciation of the Cenozoic era, the northern continents cooled and dried. The coincidence in timing implies that the cause was global rather than regional.

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Figure 1: The Eocene–Oligocene boundary in context.


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Bowen, G. When the world turned cold. Nature 445, 607–608 (2007).

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