00:005,000 years ago, early farmers in northwestern Europe cleared forests, cultivated fields,
00:06and left behind massive, enduring stone monuments to house their dead.
00:11But then, this sprawling agricultural network collapsed.
00:15Across the region, fields were left untended, and thick, wild forests slowly crept back
00:21over the once-cultivated land, plunging these communities into a mysterious demographic slump
00:27known as the Neolithic Decline.
00:29For decades, archaeologists debated why.
00:32No signs of massive invasion.
00:34No evidence of widespread conflict or sudden mass migration.
00:38Why would an entire civilization simply abandon their homes?
00:43This period represents a massive disruption in the human record.
00:46A centuries-long silence that required new biological data to explain.
00:51That data recently emerged 50 kilometers north of Paris.
00:55At the Burry tomb, researchers uncovered the jumbled, overlapping skeletons of 132 individuals.
01:02At first glance, this looked like a typical communal graveyard, a place where a single farming
01:08community laid their dead to rest over a long period.
01:11But genomic sequencing revealed a chronological anomaly.
01:15The data shows the tomb was used in two completely separate phases.
01:19One group of bodies clusters around 3100 BC, followed by centuries of silence, until a second, genetically
01:27distinct population appears much later.
01:29This gap in the timeline suggests the original builders did not slowly evolve or move away.
01:35They hit an absolute end point.
01:38The people from that first phase, around 3200 BC, were a deeply interconnected local clan.
01:44Genomic reconstruction shows their family bonds were sprawling, spanning up to five generations
01:49within the same tomb.
01:51Yet this family was struggling.
01:53The bones show young people dying prematurely, pointing to a catastrophic event rather than natural
01:59decline.
01:59The mortality data confirms that an active and lethal force was moving through the community,
02:05striking indiscriminately across every generation.
02:08The stark evidence for what happened was preserved inside their teeth.
02:12By extracting ancient DNA directly from the dental pulp, scientists isolated the pathogens present
02:18at the time of death.
02:19The sequencing ultimately matched the DNA of Borrelia recurrentis, which causes relapsing fever,
02:25and Yersinia pestis, the plague bacterium.
02:27This disease load explains the environmental shift seen in the Paris Basin.
02:32Pollen records show a massive regrowth of wild forest over grazing land, confirming that
02:37human activity in the region had effectively ceased.
02:40The combined impact of these infections fractured the clan's social structure, creating a centuries-long
02:46demographic vacuum.
02:47When the Burry tomb finally reopened centuries later, the people using it were complete strangers
02:52to the original builders.
02:53Their DNA reveals a long migration from southern France and the Iberian Peninsula.
03:00These newcomers brought different traditions, burying their dead in flexed positions and favoring
03:06smaller family lines.
03:07For this new society, shared culture or social status had become as important as biological
03:13bloodlines.
03:14There is no sign of integration with the original population.
03:18These migrants claimed an empty landscape and imported an entirely foreign social order.
03:24The Burry tomb reveals that the Neolithic decline was a total population replacement, driven
03:30by disease.
03:31This local collapse mirrors a broader disruption across northwestern Europe, where microscopic
03:36pathogens emptied the landscape and cleared the way for new lineages to arrive.
03:41It leads us to question how many other thriving societies were erased by pathogens long before
03:47we had the tools to detect them.
03:49Biological forces decided who remained to inherit the earth.
03:53While we see the stone monuments they left behind, their true history is written in their
03:59DNA.
04:00Subscribe to explore more stories from our ancient past.
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