Researchers at the University of Oxford have announced a major refinement in archaeological dating using a new Pulsed-Laser Optically Stimulated Luminescence (OSL) methodology. Applied to quartz grains from the Ga-Mohana Hill North Rock Shelter in South Africa, the technique has pushed back the timeline of the Middle Stone Age (MSA) behavioral transition to 125,000 years ago with a margin of error of less than 200 years.
This unprecedented precision allows scientists to correlate early human innovation—such as the production of pigment-based symbolic artifacts—with specific millennial-scale climate oscillations. The findings suggest that early modern humans in the Kalahari developed complex social networks and symbolic expression during a brief period of high humidity, rather than as a response to desertification as previously hypothesized.