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Americas May Have Fused Earlier Than Thought, Geologists Say

The continents of North and South America came together much earlier than previously thought, according to researchers who found evidence in rock deposits from ancient rivers in Colombia of the land bridge that connected the long-isolated land masses. The two continents are linked at Panama, but there has been a debate about when this land bridge first appeared, with most experts placing its formation at about 3 million years ago. The new study, published Thursday in the journal...

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