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The Middle Stone Age (MSA) of southern Africa represents a period during which anatomically modern humans adopted a series of diverse cultural innovations. Researchers generally attribute these behavioral changes to environmental, neurological, or demographic causes, but none of these alone offers a satisfactory explanation. Even as patterns at site level come into focus, large-scale trends in cultural expansions remain poorly understood. This paper presents different ways to view diachronic datasets from localities in southern Africa and specifically tests hypotheses of environmental and cultural causality. We employ an array of analyses in an attempt to understand large-scale variability observed during the MSA. We evaluated the diversity of stone tool assemblages to model site use, examined transport distances of lithic raw materials to understand patterns of movement, assessed the cultural capacities required to manufacture and use different sets of tools, applied stochastic models to examine the geographic distribution of sites, and reconstructed biome classes and climatic constraints. Our large-scale analysis allowed the research team to integrate different types of information and examine diachronic trends during the MSA. Based on our results, the range of cultural capacity expanded during the MSA. We define cultural capacity as the behavioral potential of a group expressed through the problemsolution distance required to manufacture and use tools. Our dataset also indicates that the actual behavior exhibited by MSA people, their cultural performance as expressed in the archaeological record, is not equivalent to their cultural capacity. Instead we observe that the J Archaeol Method Theory

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Systematic prospection and excavations in the Rustaq region of northern Oman, approximately 45 km from the coast in the foothills of the Western Hajar Mountains, have revealed an unexpectedly dense record of Neolithic sites. Besides surface scatters of lithic artefacts, excavation at the site of Hayy al‐Sarh recovered two stratified archaeological horizons (AHs). The upper horizon, AH I, contained pierced marine shells that provided an age of the archaeological material of about 6800 to 7500 years cal BP. Typologically the AH I lithic assemblage compares to the Suwayh facies defined at the coast 300 km to the east. Whether the marine shells and cultural affinities point towards exchange with coastal communities or possibly seasonal movement remains an open question at this state of research, but this new evidence for inland Neolithic settlement near Rustaq provides important new data that will help improve our understanding of spatial patterns of Neolithic demographic variability.

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