Neandertal populations in the Iberian Peninsula were experiencing local extinction and replacement even before Homo sapiens arrived, according to a study published March 30, 2022 in the open-access journal PLOS ONE by Joseba Rios-Garaizar of the Archaeological Museum of Bilbao, Spain and colleagues.

Neandertals disappeared around 40,000 years ago, but many details of their extinction remain unclear. To elucidate the situation, it is useful to explore how Neandertal populations were changing during their final millennia. In this study, researchers examined the distribution of a tool complex known as the Chatelperronian, which is thought to be unique to certain populations of Neandertals in France and the Iberian Peninsula.

The researchers examined over 5,000 remains of Chatelperronian tools from a site called Aranbaltza II in Barrika, in the Northern Iberian Peninsula, dating to around 45,500 years ago. Comparing this site with other nearby Neandertal tool sites, they document that the Chatelperronian system does not overlap in time with older Neandertal technologies in this region, suggesting that Chatelperronian tools were not developed from earlier Iberian technology, but instead originated elsewhere before migrating into the region. They also found that Chatelperronian tools appear earlier than the first Homo sapiens tools in the Iberian Peninsula.

Based on this evidence, the authors suggest that older Iberian Neandertal populations disappeared, taking their tool styles with them, and were replaced by different Neandertal groups using Chatelperronian tools, likely migrating from France, and these populations were in turn replaced by Homo sapiens. The researchers propose that these patterns of local Neandertal extinction and replacement will be an important area of future study, as they might have played a significant role in the decline and ultimate demise of Neandertals.

The authors add: "Neandertals with Chatelperronian technology occupied the Northern Iberian Peninsula ca. 43,000 years ago. This territory was unoccupied at the time, following the earlier disappearance of local Neandertal groups, along with their Mousterian technology."

Research Report: "The intrusive nature of the Chatelperronian in the Iberian Peninsula"

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