A new study published in Nature Ecology & Evolution examines the remains of 132 individuals buried in a large megalithic tomb near Bury, about 50 kilometers north of Paris. The site was used during two separate time periods, with a significant population decline occurring around 3000 BC between them. Genetic analysis shows that the people buried before and after this decline were not related, indicating a major population replacement. "We see a clear genetic break between the two periods," said Frederik Valeur Seersholm, assistant professor at the Globe Institute at the University of Copenhagen and one of the lead authors of the study. "The earlier group resembles Stone Age farming populations from northern France and Germany, while the later group shows strong genetic links to southern France and the Iberian Peninsula." These results point to a sharp drop in the local population, followed by the arrival of new groups migrating from the south.…