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Nature Geoscience 1, 294–295 (1 May 2008) | doi:10.1038/ngeo191

Palaeoclimatology: A tale of two climates

Katharina Billups

Substantial Antarctic glaciation commenced rapidly 34 million years ago at the geologic interval known as the Eocene–Oligocene boundary, which separates one of the warmest intervals of the past 65 million years from one of its coldest periods (Fig. 1).