Nature reports: The meeting of the Society of American Archeology listened to Dr. Fehren-Schmitz, who presented the sequencing of human bone found in Peru at a site called Lauricocha. The remnants are from five individuals, two of them died around 9000 years ago, a third 2.500 years later and another a further 2300 years later, the fifth was dated. The sequences were derived from mitochondria and from the Y chromosome.
The results are in agreement with a single wave of migration. There might be earler migration but not necessarily. It is now up to investigator to sequence the actual indigenous population to see whether there are dicrepancies to this determination