No One Home? New Evidence for MIS 3 Occupations in the Western Cape (South Africa) from Mertenhof Rock Shelter

Southern Africa features an intensively studied Stone Age sequence, though one with geographical and temporal gaps. The archaeology of Marine Isotope Stage (MIS) 3 remains understudied, particularly between similar to 50 and 25 ka. This period encompasses important ecological, demographic and cultural changes, most notably the transition from Middle Stone Age (MSA) to Later Stone Age (LSA) technologies. In western South Africa, previous research postulated a demographic hiatus during the second half of MIS 3, potentially due to hyperarid climatic conditions. Here, we provide evidence of occupation during this period at Mertenhof Rock Shelter (MRS) in the form of new chronometric and technological data. OSL estimates suggest two pulses of low-intensity occupations at similar to 50 ka and 41-37 ka, allowing for a diachronic assessment of technological changes. These sporadic MSA occupations complement the more widespread occurrence of open-air settlements along the Doring River during similar to 50-35 ka. At MRS, knappers procured local rock types and produced small flakes and some laminar elements via platform, bipolar and Levallois reduction. The retouched elements feature splintered pieces and denticulates but mostly lack points. Differences to contemporaneous sites in eastern southern Africa underscore ongoing technological regionalisation and demographic partitioning during MIS 3. The temporal changes in the sequence show some antecedents of Early LSA technological systems, which appear in the region around 25 ka, but not in a unidirectional manner. Lithic and chronometric evidence from MRS supports scenarios of a long MSA persistence within MIS 3 in southern Africa and a late emergence of the LSA sometime after 35 ka.