AAAS EurekAlert
Posth et al. 2018. Reconstructing the Deep Population History of Central and South America" Cell 175: 1185-1197.

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Posth et al. 2018

Ancient DNA evidence reveals two unknown migrations from North to South America

"An international research team has used genome-wide ancient DNA data to revise Central and South American history. Their analysis of DNA from 49 individuals spanning about 10,000 years in Belize, Brazil, the Central Andes, and southern South America has concluded that the majority of Central and South American ancestry arrived from at least three different streams of people entering from North America, all arising from one ancestral lineage of migrants who crossed the Bering Strait some time before 15,000 years ago."