Scientists finally discovered who made these mysterious 45,000-year-old Ice Age tools

The debate over the origin of an unusual collection of stone tools found across Europe during the Ice Age has been ongoing among archaeologists for many decades. Some archaeologists thought the stone tools were made by Neanderthals, while others believed they were made by early Homo sapiens. However, breakthroughs in solving this mystery did not occur until 2024.

The discovery was made at the Ilsenhöhle cave site in Ranis, with scientists tracing the mysterious Lincombian-Ranisian-Jerzmanowician, or LRJ, tool industry back to modern humans, dating it to around 45,000 years ago. It also pushed back the secure timeline for modern humans living in northern Europe during the Ice Age.

A cave that changed the debate
The breakthrough centred on a sparse collection of human remains discovered beside LRJ stone tools at Ilsenhöhle cave. It had been difficult for archaeologists to identify the makers of these distinctively shaped stone tools, since both Neanderthals and modern humans lived in Europe at the time.

According to a 2024 Nature report, researchers extracted DNA from bone fragments found at the site. The fossils belonged to Homo sapiens and dated back about 45,000 years. Another revelation made in this study was that the LRJ industry could be attributed to modern humans. Similar artifacts had been found across Britain, Poland, and central Europe; however, it was unclear whose remains were associated with them.

A research summary released by the Max Planck Institute for Evolutionary Anthropology stated that the findings “reveal for the first time the makers of the LRJ”.

Why ancient DNA mattered
The Ranis site did not contain a large human settlement or complete skeletons. Instead, archaeologists worked with tiny and highly fragmented bones, making traditional identification difficult.

As stated in another paper, the investigation's findings indicated sporadic visits by small groups of humans to the site. The authors described the area's landscape as a cold steppe, populated with reindeer, horses, and woolly rhinoceroses. Because the material record was limited, the role of genetics became vital. Using ancient DNA, researchers established a direct connection between the species of mankind and the LRJ tools.

The same paper highlighted thousands of tiny animal bones found in the cave, indicating sporadic use by humans, bears, and hyenas. It was concluded that early Homo sapiens temporarily visited the place, passing through the cold northern regions.

Modern humans farther north than expected
The age of the Ranis places them in a critical phase of European prehistory when modern humans and Neanderthals overlapped across the continent. In a separate study, the genomes from these people revealed their place in the early lineage of modern humans in Europe. It also helped researchers determine when and how Neanderthals interbred with humans.

Furthermore, the study highlighted the broader geographic significance of the finding, noting that Homo sapiens had already reached northern Europe more than 45,000 years ago.

This is particularly significant since the earliest evidence of modern humans in Europe was predominantly found in the south and centre of the continent. The discovery showed that modern humans had spread farther north in Europe during a period when Neanderthals still occupied parts of the continent.


More than just stone tools
Ranis discoveries highlight yet another change in the way modern archaeologists work, as more genetic studies are being performed along with traditional excavations. Ranis represents the oldest known evidence of Homo sapiens in northern Europe. The museum noted that the discovery helped solve a long-running mystery surrounding the LRJ industry, whose makers had long remained uncertain.

At Ranis, researchers applied a range of methods, including traditional archaeology, sediment DNA, isotopic analysis, and zooarchaeology. Thus, they gained deeper insights into the patterns of early human migration across Europe during the Ice Age. It has also been reported that genetic analysis of bone fragments indicates the presence of modern humans in northern Europe, even though Neanderthals lived further south on the continent.

Although the Ranis cave contains only a meagre number of remains and tools, its significance is far greater. Just a few fragments of DNA provided clues to the identities behind an obscure technology, extended the territory covered by Homo sapiens farther north than ever before, and changed our understanding of our species' migration.