North and South America was inhabited only 25,000 years ago. New research, and evidence of Neanderthals and Denisovans, turns the basic notion of a north-to-south migration upside-down.
We know that the Americas were the last two continents that humans called home. We also know that from an archeological perspective, neither North or South America was inhabited that long ago — specifically, only around 25,000 years ago.
“This is the first time that we’ve proposed this south-to-north migration,” says study co-author Andre Luiz Campelo dos Santos, a postdoctoral fellow at Florida Atlantic University. One ancient sample from Panama even harbored genetic traces of Indigenous Australians and those from Papua New Guinea. While these genetic signals have been found before in ancient Amazonians, this is the first time they have been found in Central Americans. Even stranger, these markers are not found in North American samples.
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