https://www.cell.com/current-biology...gg2cetTqTWGgJM

Highlights

We sequenced 20 Native American Y chromosomes chosen for their genetic diversity

A Beringian Standstill of <4,600 years led to both Siberian and American Y-lineages

Y-lineage split times rule out occupation of the Americas before 19,500 years ago

Present-day male population structure in South America arose before 12,000 years ago