30,000-Year-Old Geometric Microliths Reveal Glacial Refugium in Dhofar, Southern Oman

Despite its significant geographic position along the southern corridor into and out of Africa, little is known of the period between 70 and 12 thousand years ago in South Arabia. The existing archeological data come from a handful of lithic surface scatters and buried sites with broad chronological constraints. Here, we report the open-air site of Matafah, a stratified deposit in the Wadi Ghadun drainage system of Dhofar, southern Oman. The accretional terrace discovered at Matafah is composed of low-energy overbank sediments interstratified with cemented layers of fluvial gravels, eolian sands, and hillslope deposits. Three discrete archeological horizons were excavated from the 2.5-m stratigraphic sequence, including Holocene assemblages that overlie a heretofore-unknown assemblage type with geometric microliths. Optically stimulated luminescence age estimates bracket this lower assemblage between 33 and 30 thousand years ago, providing the earliest evidence for the use of projectile armatures in the Arabian Peninsula.