Cave Sediment Yields Ancient Human DNA in Spain
The method traces who lived in a cave without any bones, pointing to a research approach expected to spread across archaeology.
Updated on Oct. 31, 2026 in Life Sciences
Researchers recovered nuclear ancient human DNA from sediment in El Mirón Cave in Spain, using a sample weighing no more than a few grains of rice. The study, led by researchers at the University of Vienna and published in Science Advances, is research-stage rather than an established technique applied across sites.
Why it matters
The findings suggest human populations in southwest Europe remained genetically continuous between 30,000 and 20,000 years ago. Sedimentary DNA, which can reveal who lived somewhere without any skeletal remains, is increasingly being applied to archaeological sites, and this study demonstrates it can yield human genetic data from a cave layer with no bones.
The analysis required sequencing the sample 100 times and filtering more than a billion DNA fragments to isolate human sequences from a sample of only a few grains of rice. Comparison against a roughly 31,000-year-old French woman's remains and a roughly 25,000-year-old northern Spanish tooth supports the western ancestry group interpretation, though the result rests on DNA alone.
The players
University of Vienna
An Austrian research university whose team led the El Mirón sedaDNA study that recovered ancient human DNA from cave sediment.
The details
Researchers extracted nuclear DNA, the genetic material found in a cell's nucleus, directly from the cave's sediment, which is the layer of soil and debris accumulated over time. Because people shed cells and traces of DNA into the surrounding ground, sediment can preserve a record of who was present even when no bones survive. The team then compared the El Mirón genetic profile against two other ancient human genomes, one from France and one from northern Spain, to place the cave's inhabitants within a broader western ancestry group.
Timeline
Animal and human mitochondrial DNA dated to 46,000 to 21,000 years ago were found in El Mirón dirt samples in 2025.
The DNA recovered in the new study comes from individuals who lived roughly 22,000 years ago.
The study was published in Science Advances in 2026.
The Tech Race
Sedimentary ancient DNA is an emerging method being applied across archaeology, and the study's authors project its use at wide variety of sites will increase rapidly in coming years. The El Mirón work builds on the 2025 mitochondrial DNA results from the same cave and on earlier genome comparisons from France and Spain.
The technique is a research method used by archaeologists and geneticists rather than a consumer tool, so it does not change anything for the general public directly. Its near-term effect is on how researchers study ancient populations at sites where bones are absent.
The takeaway
Watch for further sedimentary DNA studies from additional archaeological sites, which the research team expects to become more common in the next few years. The next test of this approach will be whether the same continuity pattern appears in other cave layers across Europe.
Further reading
For broader context on how genetic science is reconstructing ancient populations, explore Life Sciences.
