A Cave In Poland May Have Just Changed The Neanderthal Story

Poland Was a Neanderthal Hotspot 100,000 Years Ago. We’re Only Finding Out Now.

Seven Neanderthals walked into a cave in southern Poland somewhere between 130,000 and 80,000 years ago. They left behind their teeth. Those teeth carry enough genetic information to reshape how scientists understand prehistoric human history across an entire continent.

A team of researchers extracted ancient genetic material from nine teeth found inside Stajnia Cave, a limestone site in southern Poland. Eight of those teeth yielded usable data. Because some teeth shared identical DNA, suggesting they came from the same person or close relatives, the collection represents at least seven separate individuals. It is the oldest multi-individual Neanderthal genetic dataset yet characterized in Central Europe, placing Poland at the center of a story long dominated by fossil sites in France, Spain, and the Caucasus.

Published in Current Biology and led by Andrea Picin of the University of Bologna, the study combines tooth shape analysis, radiocarbon dating, and complete mitochondrial DNA sequences, the genetic material passed from mother to child, from eight of the nine teeth.

Pulling Ancient DNA From Tiny Samples

Researchers took powder samples between 8 and roughly 30 milligrams from each tooth, nearly invisible to the naked eye and kept small to preserve the specimens. Each sample was treated chemically to strip away modern human and bacterial contamination, then processed to extract whatever ancient DNA remained.

From these fragments, the team reconstructed complete or near-complete genetic profiles for all eight specimens. Authenticity was confirmed by a specific pattern of chemical damage that accumulates in DNA over thousands of years. Placed on a family tree alongside every other known Neanderthal genome, all the Stajnia individuals fell within the established range of Neanderthal genetic variation.

Seven Neanderthals, One Maternal Line, and a Scrambled Cave

One of the most surprising discoveries involved three teeth recovered from completely different layers of the cave. Despite coming from what appeared to be different time periods based on their position in the ground, all three produced identical mitochondrial DNA sequences.

That finding pointed to a problem with the cave itself, not the genetics. Identical maternal DNA scattered across multiple sediment layers strongly suggests the cave’s interior has been shuffled over thousands of years. In other words, the depth at which a tooth was found does not reliably indicate when its owner lived there.

Two of the three matching teeth came from juveniles and could potentially belong to the same child. The third belonged to an adult, almost certainly a different person who shared the same maternal bloodline. Accounting for all genetic profiles, tooth shapes, and estimated ages at death, the team identified at least seven, and possibly eight, distinct individuals.

Radiocarbon dating proved largely unreliable here. Most results were thrown off because the teeth had likely been treated with chemical preservatives after excavation, introducing modern carbon that skewed the readings. The samples were also too small to fully clean before testing. Only one tooth came back with a date old enough to be useful, and even then the broader picture depends heavily on molecular age estimates with significant uncertainty built in.

To work around those limitations, the team used a technique called molecular branch shortening. DNA accumulates mutations at a roughly predictable rate, so by counting how many a sample has compared with others whose ages are known, researchers can estimate when it dates from. Using this approach, the team placed all the Stajnia individuals in a warm period roughly between 130,000 and 80,000 years ago. The younger ends of those ranges, dipping toward colder periods around 70,000 to 60,000 years ago, are archaeologically unlikely for Neanderthal occupation in southern Poland, given what is known about ice sheet expansion during those phases.

An Ongoing Debate Over a Famous French Neanderthal

The study also weighs in on a live scientific disagreement about a Neanderthal nicknamed “Thorin,” discovered in southeastern France and carrying a genetic profile closely related to the Stajnia individuals. That shared lineage is what makes the debate matter: if Thorin is accurately dated, it affects how scientists read the entire Stajnia timeline. A 2024 paper proposed he lived around 50,000 years ago, which would make him surprisingly young for someone carrying that particular genetic lineage.

The Stajnia team argues the radiocarbon measurements used to date Thorin were statistically indistinguishable from background noise and should have been treated as beyond the limit of detection rather than firm ages. They also raise concerns about other dating methods applied to Thorin. When his proposed archaeological age was removed from the genetic model, his estimated age aligned more closely with the older Stajnia specimens. Whether Thorin is genuinely that young remains an open question.

What Polish Teeth Reveal About Neanderthal Range

Neanderthals carrying maternal genetic lines closely related to Stajnia have been found in southeastern France, Spain, and the Caucasus, pointing to a lineage once widespread across the continent before eventually being replaced by the DNA characteristic of later Neanderthal populations.

For decades, Central and Eastern Europe played a supporting role in the Neanderthal story, with DNA-yielding fossils frustratingly rare and most genetic knowledge drawn from Western Europe and the Caucasus. Stajnia Cave shifts that picture. A handful of teeth from a modest Polish site have made it considerably harder to tell the Neanderthal story without Central Europe near the center of it.

---