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Signs of ancient sea ice

Fossils of certain marine algae suggest floating ice debuted in the Arctic at least 47.5 million years ago

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1:09pm, July 15, 2009

Fossils of ice-dependent algae reveal that Arctic sea ice, which is today very much an endangered species, formed at least 47.5 million years ago, about 1.5 million years earlier than previously recognized.

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