Location of the sampled individuals and estimated dates. The map was obtained from https://mapswire.com under a CC BY 4.0 license (https://creativecommons.org/licenses/by/4.0/)
More than 30,000 years ago, people living in Ice Age Europe were leaving genetic evidence of connections between widely separated populations — tens of thousands of years before the world supposedly existed, according to the familiar young-Earth creationist interpretation of Genesis. Their descendants inherited traces of those encounters, and scientists can now recover those traces from ancient human remains. What emerges is a history of migration, interbreeding and survival through changing climates, on a timescale wholly incompatible with a recent creation followed by a global flood and the repopulation of Earth by Noah’s family.
The evidence comes from a study led by researchers at the University of Vienna, published in Science Advances. A woman who lived around 30,000 years ago, whose remains were found in Isturitz Cave in south-western France, carried predominantly western European ancestry, together with ancestry related to populations farther east. Assuming a single pulse of admixture, genetic modelling places that exchange approximately 32,500–31,500 years ago. This does not mean that the woman herself crossed Europe: her genome preserves evidence of connections between ancestral populations.
The researchers also recovered human nuclear DNA from an approximately 22,000-year-old sediment layer at El Mirón Cave in northern Spain, despite the absence of human bones or teeth. This supports the persistence of western European ancestry through the Last Glacial Maximum. Regional continuity and incoming ancestry could therefore coexist: populations could maintain deep local roots while also exchanging genes with other groups.
For biblical literalism, the difficulty extends beyond finding room for another inconveniently ancient date. Here are distinguishable populations, an inferred episode of interbreeding and evidence of ancestry persisting through a major climatic upheaval. These findings belong to a reconstructable human history stretching far beyond the few thousand years allowed by young-Earth chronology. Compressing that history into a post-Flood dispersal would require evidence for the compression, not simply a declaration that the biblical account must be correct.
There is also a useful lesson here about how science changes its mind. Previous genetic evidence had suggested a more sharply divided regional picture. The new findings reveal earlier connections reaching into south-western Europe, prompting researchers to refine that interpretation. They do not discard everything previously established; they revise the particular claims that the additional evidence challenges. That is how an evidence-based account becomes more accurate.
The contrast with creationism is straightforward. In science, an explanation remains answerable to discoveries that might require its revision. In biblical literalism, the conclusion is fixed in advance, leaving the evidence to be accommodated, dismissed or denied. These Ice Age Europeans had no obligation to live within a chronology devised millennia after their deaths — and their DNA shows that they did not.
How can cave sediment preserve human DNA? A cave floor can retain genetic traces of its former occupants even when archaeologists find no recognisable human bones or teeth. This material is called sedimentary ancient DNA, often abbreviated to sedaDNA. Recovering it involves three separate tasks: extracting tiny surviving fragments, identifying the organisms they came from, and checking that they are genuinely ancient.The paper in Science Advances was accompanied by a University of Vienna news release:
Where does the DNA come from?
Potential sources include faeces, bodily fluids, shed cells and decomposing tissues, together with microscopic fragments of bone and teeth. “No skeletal remains found” therefore does not necessarily mean that the sediment contains no microscopic skeletal material. Research at Denisova Cave showed that tiny bone and faecal particles were particularly important reservoirs of ancient mammalian DNA.
DNA can also bind to mineral surfaces, which may help protect it against destruction. Preservation varies with temperature, moisture, sediment chemistry and microbial activity. What survives is usually a collection of short, damaged molecular fragments, not intact cells or complete chromosomes.
How is it recovered?
Researchers collect sediment from precisely recorded positions within archaeological layers, using precautions against contamination. In dedicated ancient-DNA laboratories, chemical treatments release DNA from the sample. Purification methods retain very short fragments while removing substances that could interfere with subsequent analysis.
The fragments are then prepared for sequencing, which reads the order of their chemical “letters” — A, C, G and T. Because human DNA may form only a minute fraction of the total, researchers often use hybridisation capture: specially designed molecular probes bind to matching DNA sequences, enriching the extract for the genetic regions of interest. This improves recovery but does not, by itself, prove a fragment’s identity or antiquity.
How is human DNA distinguished from bacterial or animal DNA?
Although organisms use the same DNA alphabet, their sequences differ. Computer programmes compare recovered fragments with reference sequences from humans and other organisms. Many bacterial sequences are readily distinguishable from human ones; short sequences shared by several organisms are more problematic.
Researchers therefore apply quality filters and exclude ambiguous matches rather than assuming that every fragment resembling human DNA must be human. Identification depends on sufficiently informative sequence matches, supported across multiple fragments. Where suitable genetic positions survive, comparisons can also distinguish modern-human, Neanderthal and Denisovan lineages.
Mitochondrial DNA, normally inherited through the maternal line, is often easier to recover because cells contain many copies. Nuclear DNA, inherited from both parents, provides a much broader basis for investigating population ancestry and interbreeding.
How do scientists exclude modern contamination?
DNA from an excavator or laboratory worker is also human, so identifying the species is insufficient. Researchers combine several safeguards:
- Contamination prevention: protective clothing, clean equipment and dedicated laboratory facilities reduce the introduction of modern DNA.
- Blank controls: samples processed without sediment help reveal DNA introduced by reagents or laboratory procedures.
- Fragment length: ancient DNA is generally highly fragmented, although shortness alone cannot establish its age.
- Chemical damage: ancient molecules often show characteristic changes near their ends. In particular, damaged cytosine can be read as thymine during sequencing.
- Consistency checks: researchers assess whether conclusions persist after stringent filtering, including analyses restricted to fragments showing ancient damage.
No single test is decisive in every case. Confidence comes from the agreement of independent checks. Damage patterns help authenticate ancient DNA; they are not a precise calendar for dating each fragment.
How is its age established?
The age generally comes from the sediment’s archaeological and geological context, supported by methods such as radiocarbon dating of associated material or luminescence dating of sediment grains. Researchers must also investigate whether water, burrowing animals or later disturbance could have moved material between layers. An ancient molecule is not automatically the same age as the layer in which it was recovered.
What did this study recover?
At El Mirón Cave in northern Spain, the researchers recovered information at approximately 14,000 variable positions in the human nuclear genome from a sediment layer dated to around 22,000 years ago. These data supported the persistence of western European ancestry through the Last Glacial Maximum.
This was not a complete genome reconstructed from a single identifiable person. Sediment can contain DNA from several individuals, potentially deposited during different visits. Its value lies in revealing genetic ancestry where conventional human fossils are missing, while retaining appropriate limits on what can be inferred.
Ancient human DNA reveals hidden connections across Ice Age Europe
New genomic data show long-distance population contacts alongside thousands of years of regional continuity
More than 30,000 years ago, people associated with one of Europe’s major Palaeolithic cultures (the Gravettian) were more interconnected than previously thought. An international research team led by the University of Vienna has uncovered new genetic evidence of long-distance connections between these populations. Published in Science Advances, the study combines genomic data from rare human remains with human DNA preserved in cave sediments.
The Gravettian culture was widespread across Europe around 34,000 to 25,000 years ago. While archaeological finds have long suggested extensive contacts across the continent, genetic data pointed to relatively stable eastern and western ancestry groups. By analysing new and previously published genomic data alongside human DNA from cave sediments, the researchers found evidence of east-west genetic exchange and long-term population continuity in southwestern Europe.
Inside Isturitz Cave in southwestern France.© Severine Dabadie.
A woman's genome links east and west
The remains of a woman from Isturitz Cave in southwestern France, who lived around 30,000 years ago, yielded the oldest to date genome-wide dataset of a modern human from southwestern Europe. Her genetic data provide key evidence of east-west exchange: most of her ancestry was related to the western European lineage, but she also carried ancestry related to populations from central and eastern Europe. Genetic modelling dates this gene flow to around 32,500 to 31,500 years ago.
Our results show that eastern and western European populations were not as genetically isolated as previously assumed. Gene flow across such large distances adds a new dimension to our understanding of how Gravettian populations were connected.
Pere Gelabert, first author
Department of Evolutionary Anthropology
University of Vienna
Vienna, Austria.
A similar signal was found in a previously studied individual from Ormesson, France. Together with archaeological evidence, the new findings also support the idea that Isturitz may have been a meeting place for different groups.
Human DNA from cave sediment
At the same time, the researchers found evidence for long-term population continuity in southwestern Europe. Genomic data from Chufín Cave in northern Spain indicate that western European ancestry persisted in the region over thousands of years. The team also analysed ancient human DNA preserved directly in cave sediment. At El Mirón Cave in Cantabria, they recovered enough human nuclear DNA from a 22,000-year-old layer to determine its genetic ancestry – despite the absence of human bones or teeth.Sedimentary DNA allows us to recover genetic information from periods where human remains are missing. This gives us a way to connect archaeological layers with the genetic ancestry of the people who occupied a site.
Ron Pinhasi, senior author.
Department of Evolutionary Anthropology
University of Vienna
Vienna, Austria.
The El Mirón DNA shows that this ancestry persisted through the Last Glacial Maximum, supporting the idea of the Iberian Peninsula as an Ice Age refuge.
What mother and son reveal about mating
In southern Italy, the team analysed Ostuni1b, a male fetus and most likely the son of the previously studied woman Ostuni1. His father probably came from the same genetic population, yet the parents were not closely related – suggesting mating practices that helped avoid high levels of inbreeding. Together, the findings show that regional population continuity could coexist with genetic exchange over large distances. Gelabert's team is now combining sedimentary DNA with advanced proteomic analyses to investigate the first trans-European expansions of modern humans and their interactions with carnivores where organic remains are scarce.
Summary:
- New genomic data reveal previously undetected genetic connections between eastern and western Gravettian populations in southwestern Europe.
- Genetic modelling dates this gene flow to around 32,500–31,500 years ago.
- Human DNA recovered directly from cave sediment traces long-term population continuity even where skeletal remains are missing.
- Genetic data from a mother and her son provide clues to population stability and mating practices in Gravettian Italy.
Publication:
The history emerging from these discoveries is one of human populations moving, meeting and exchanging genes across Ice Age Europe, while some regional ancestry persisted through thousands of years of climatic change. These were people with ancestors, relatives and descendants, embedded in a history already ancient long before the supposed date of biblical creation. Their genetic connections cannot be reconciled with young-Earth chronology simply by relabelling them as descendants of Noah.
The evidence also presents a challenge to the alleged global flood. Ancient remains and sedimentary DNA occur within archaeological sequences whose chronology and integrity must be investigated, rather than assumed. A creationist explanation would need to account for the preservation of those sequences and their genetic evidence through the proposed catastrophe, as well as explain why independent methods place them so far outside the biblical timetable. Invoking a flood supplies none of that explanatory work.
Meanwhile, the researchers have done precisely what scientists are supposed to do when new evidence challenges an earlier interpretation: revise it. The emerging picture allows for more extensive early connections between eastern and western populations than previous genetic sampling had revealed. Regional continuity remains part of the explanation, but it no longer implies the same degree of isolation. This is a specific improvement in our understanding, with uncertainties acknowledged and conclusions open to further testing.
For creationism, such revisions are often presented as evidence that science cannot be trusted. Yet the willingness to identify and correct an incomplete explanation is one of science’s principal strengths. A belief protected from correction can remain unchanged indefinitely, regardless of how wrong it is. Scientific knowledge advances because evidence is allowed to change the answer.
These people left no written account of their origins, but traces of their lives have survived in their bones and even in the sediment beneath their feet. With careful analysis, those traces reveal a human past far deeper and more complex than biblical mythology allows. The cave floor was never intended to tell a story, yet it preserves evidence that a supposedly infallible creation narrative fails to accommodate.
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