THE EYE OF THE SAHARA HYPOTHESIS - Richat: A Testable Candidate for Saharan Migration to the Nile

Between ~14,800 and 5,500 years ago the Sahara was green — savanna, rivers, lakes, and home to tens of thousands of pastoralists. When the African Humid Period ended abruptly at ~5.5 ka, populations across the western Sahara faced a collapsing landscape. This predictive model hypothesizes that climate-forced eastward migration from this drying region introduced new demographic and technological elements into the Nile Valley — including western Saharan isotopic signatures now documented in Predynastic cemeteries and the sudden appearance of sophisticated hard-stone vessels with no clear local antecedents. The framework prioritizes the Richat Structure in Mauritania as a high-diagnostic geological candidate due to its unique co-located assemblage of rhyolite, gabbro, and breccia — a tri-lithic suite that directly matches the Egyptian hard-stone sourcing problem. The migration is proposed to have unfolded through a refugia-stage process, with initial displacement to intermediate zones (Gilf Kebir, Abu Ballas) between ~5.5–5.0 ka, followed by consolidation and movement to the Nile by ~5.0–4.5 ka, coinciding with the Naqada I–II period.