Kenneth Glad
New research is adding detail to a long-debated prehistoric turning point. The evidence points to crisis, movement and changing social life in ancient Europe.
According to the University of Copenhagen, DNA from a large Stone Age tomb near Bury, north of Paris, points to a sharp population decline followed by the arrival of people with southern European roots.
The finding matters because archaeologists have long debated the Neolithic decline, a period around 5,000 years ago when populations fell in parts of Europe, farming appears to have weakened and large stone burial traditions began to fade.
Researchers analyzed genetic material from 132 people buried in the megalithic grave. The study, published in Nature Ecology & Evolution, shows how ancient DNA can reveal family ties, migration and social change, even when it cannot fully explain why a society came under pressure.
Two communities used one tomb
Used in two separate phases around 3000 BC, the grave preserved evidence of a striking break. The earlier group was genetically varied and linked to farming communities in northern France and Germany.
Frederik Valeur Seersholm, assistant professor at the Globe Institute and one of the study’s lead authors, said: “We see a clear genetic break between the two periods.”
He added: “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.”
That break does not simply describe a change in burial custom. It suggests that the people using the tomb before and after the decline were largely different communities.
Disease may have added pressure
The researchers also looked for ancient pathogens preserved in bone. They found traces of Yersinia pestis, the bacterium linked to plague, and Borrelia recurrentis, which causes louse-borne relapsing fever.
Martin Sikora, associate professor at the University of Copenhagen and senior author of the study, said: “We can confirm that plague was present, but the evidence does not support it as the sole cause of the population collapse.”
That caution is important. A pathogen can show that people were exposed to disease, but it does not by itself prove that disease destroyed a population. The decline may have involved several overlapping pressures, including illness, food shortages, environmental strain or conflict.
Skeletal evidence also suggested unusually high mortality in the earlier phase, especially among children and young people. Laure Salanova, research director at CNRS, described the demographic pattern as a strong sign of crisis.
Burials point to a new social order
The DNA also revealed a change in how people were grouped after death. In the earlier phase, the tomb held several generations from extended families, suggesting a community organized around broad kinship ties.
After the break, the burials became more selective. Researchers found a stronger focus on one male line, a pattern that may point to inherited status or a more hierarchical social structure.
Seersholm said: “This indicates that the population change was accompanied by a shift in how society was structured.”
For archaeologists, that shift may help explain why megalithic tomb building faded in parts of Europe around the same period. If the communities that built and used such monuments declined, the traditions connected to them may have weakened as well.
The Bury site is especially valuable because it connects genetic evidence with burial practice, disease traces and environmental clues. The study also notes forest regrowth between the two phases, which may suggest abandoned farmland and reduced human activity.
The grave does not offer one simple answer to the Neolithic decline. Instead, it points to a population that appears to have declined sharply, a later movement from the south, and a prehistoric transition still coming into focus.
Sources: University of Copenhagen; Nature Ecology & Evolution
