A group of early Homo sapiens crossed into Arabia more than 100,000 years ago, long before the migration that shaped modern populations. Their presence was brief. Archaeological evidence shows they disappeared without leaving any genetic legacy.
The prevailing model states that all non-African humans descend from a dispersal that occurred between 70,000 and 50,000 years ago. This later wave succeeded where earlier ones did not.
New findings from southern Oman highlight one of these failed expansions. By documenting a human presencedating backover 100,000 years, the study adds to a growing body of evidence that early migrations out of Africa were more frequent and more fragile than once believed.
Stone Tools Reveal An Early Journey Out of Africa
At four sites in Dhofar, researchers uncovered tools associated with the Nubian Levallois technology, a method first identified in northeast Africa around 150,000 years ago. These artifacts date to between 109,000 and 95,000 years ago, pointing to an early human occupation of Arabia.
The technological similarities are significant. They suggest that these populations originated in Africa and carried their techniques across regions.
As reported in the study, currently available on Research Square, this movement likely occurred via the Bab al-Mandab Strait, which narrowed to about 5 kilometers around 115,000 years ago due to lower sea levels. This geographical shift may have created a rare window for migration.
A Habitable Landscape That Did Not Last
The Arabian Peninsula was not always the desert seen today. The researchers expalined that the evidence from the region indicates a much wetter climate during the period of occupation.
The study describes large lakes forming around 100,000 years ago, while cave formations such as stalactites and stalagmites point to active water systems.
This phase ended abruptly. Around 93,000 years ago, the Nubian Levallois tools vanish from the archaeological record. They are replaced by artifacts linked to the Mudayyan industry, which shows no continuity with earlier technologies. The authors suggested that the original population vanished entirely.
Did Climate Change Wipe Out Entire Human Populations?
Environmental data provides a consistent explanation for this shift. The region experienced rapid aridification, transforming once-habitable areas into dry landscapes.
“Groundwater-fed springs once sustained by aquifer recharge were reduced to desiccated basins,” the researchers stated, “These results demonstrate that early human expansions beyond Africa were climate-dependent and demographically fragile, and that the global establishment of our species was preceded by repeated failures.”
The study also noted that similar tools appear in the eastern Mediterranean at roughly the same time. This suggests that multiple groups left Africa in parallel. One moved into Arabia and disappeared. Another traveled north and may have encountered Neanderthals.
Neither group left a genetic trace in modern humans. As the researchers reported, lasting human expansion beyond Africa only occurred after 80,000 years ago, following earlier dispersals that failed to establish enduring populations.
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