- Archaeological News
-
Image Credit: Robrrb, CC BY-SA 3.0, via Wikimedia Commons
Ancient DNA Reveals Migration and Family Burial Traditions in Pre-Inca Peru
A new ancient DNA study has revealed evidence of long-distance migration and close family burial practices on the Pacific coast of southern Peru before the rise of the Inca Empire. The research analyzed genome-wide data from 21 individuals buried in the Chincha Valley, a major coastal region that later became part of the Inca world.
The study shows that people with ancestry linked to groups about 700 km to the north had arrived in the Chincha Valley no later than the 13th century AD. This means that migration from the northern coast began before the Inca Empire incorporated the region in the 15th century. The findings suggest that earlier coastal interaction networks were already active before Inca expansion.
Researchers examined human remains from Las Huacas in the lower Chincha Valley and from several cemeteries in the middle valley. At Las Huacas, ancient DNA helped identify relatives buried together in a communal ossuary. The evidence suggests that this was a family burial place used by closely related individuals over at least two generations. Some members of this group also appear to have practiced marriage within a limited kin network.
The study also found that later generations in the Chincha Valley showed increasing genetic mixture with other coastal populations. Early migrants appear to have had ancestry mainly from the northern coast, while later individuals show ancestry linked to northern, central, and southern coastal groups. This points to continued movement, intermarriage, and social connections along the Pacific coast.
The archaeological evidence adds further context. Some individuals had cranial modification, a practice shaped during infancy, while others had red pigment applied to their remains after death. These traditions continued from the 13th to the 15th centuries and may reflect shared cultural identity among coastal communities.
The research also improves the dating of human remains from coastal Peru, where radiocarbon dating is complicated by marine diets. By combining ancient DNA, family relationships, archaeological context, and dietary evidence, the study developed a more precise generational chronology for the Chincha Valley.
Overall, the findings show that the Chincha region was shaped by long-distance mobility, coastal exchange, and kin-based social organization before Inca rule. Rather than beginning with imperial expansion, these networks appear to have deep local and regional roots.
Published on: 25-05-2026
Edited by: Abdulmnam Samakie
Source: Nature Communications
