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Axel Heiberg fossilsPhys Org
•89% Informative
The Canadian island of Axel Heiberg is a frozen desert devoid of nearly all life.
45 million years ago , it supported a lush rainforest on the shores of the Arctic Ocean .
The forest has been buried first beneath layers of sediment, then accumulated ice, leaving it frozen in time.
The walnuts had been eroded from the soil and were sitting on the surface.
The fossils were found to represent three new species in the genus Juglans .
The study adds a clearer picture of how walnuts evolved during periods of shifting climates.
Researchers once thought the walnut family originated somewhere in Asia .
More recently, fossil data indicates they instead first appeared in the warm, moist environments of North America or Europe .
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