Abstract
AUSTRALIA and Antarctica separated about 50 million years (Myr) ago1. Echinoid populations indicate a warmer climate at the time of separation than later. A model of oceanic circulation in the Southern Hemisphere, consistent with this observation, leads to a more precise dating of the opening of the Drake Passage between South America and Antarctica.
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FOSTER, R. Eocene echinoids and the Drake Passage. Nature 249, 751 (1974). https://doi.org/10.1038/249751a0
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DOI: https://doi.org/10.1038/249751a0
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