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.
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.