Alex Mackay

Ages for the Middle Stone Age of southern Africa: implications for human behavior and dispersal.

The expansion of modern human populations in Africa 80,000 to 60,000 years ago and their initial exodus out of Africa have been tentatively linked to two phases of technological and behavioral innovation within the Middle Stone Age of southern Africa—the Still Bay and Howiesons Poort industries—that are associated with early evidence for symbols and personal ornaments. Establishing the correct sequence of events, however, has been hampered by inadequate chronologies. We report ages for nine sites from varied climatic and ecological zones across southern Africa that show that both industries were short-lived (5000 years or less), separated by about 7000 years, and coeval with genetic estimates of population expansion and exit times. Comparison with climatic records shows that these bursts of innovative behavior cannot be explained by environmental factors alone.

Coalescence and fragmentation in the late Pleistocene archaeology of southernmost Africa.

The later Pleistocene archaeological record of southernmost Africa encompasses several Middle Stone Age industries and the transition to the Later Stone Age. Through this period various signs of complex human behaviour appear episodically, including elaborate lithic technologies, osseous technologies, ornaments, motifs and abstract designs. Here we explore the regional archaeological record using different components of lithic technological systems to track the transmission of cultural information and the extent of population interaction within and between different climatic regions. The data suggest a complex set of coalescent and fragmented relationships between populations in different climate regions through the late Pleistocene, with maximum interaction (coalescence) during MIS 4 and MIS 2, and fragmentation during MIS 5 and MIS 3. Coalescent phases correlate with increases in the frequency of ornaments and other forms of symbolic expression, leading us to suggest that population interaction was a significant driver in their appearance.

Big debates over little tools: ongoing disputes over microliths on three continents

Abstract After more than a century, debate over the explanation of microliths continues. We review debates on three continents (Australia, India and southern Africa), and argue that depictions of them as purely symbolic items manufactured for public display are implausible. Two different mechanisms dominate recent discussions: 1) exchange of symbolically loaded artefacts as a device for constructing cultural connections and establishing access to territory/resources, and 2) microliths as portable and standardized tools that helped buffer foragers against economic risk and/or scheduling difficulties by increasing multi-functionality and tool readiness as an aid in reducing fluctuations in resource capture. We show that there is a different history and pattern to microlith use on each continent and dissimilar environmental contexts for microlith-intensive phases. This conclusion challenges any notion that a single simple process underpins microlith use across the globe and implies that comparative studies might enhance understandings of this process of technological change.

A characterization of the MSA stone artefact assemblage from the 1984 excavations at Klein Kliphuis, Western Cape

INTRODUCTION The primary objective of this paper is to present a characterization of the Middle Stone Age assemblage from the site of Klein Kliphuis (KKH) in the Western Cape (Fig. 1). KKH was excavated in 1984 by a team from the South African Museum (now part of Iziko Museums of Cape Town). The excavation was to form part of a larger regional project looking at the nature and distribution of Later Stone Age (LSA) huntergatherer and herder sites. During the course of the excavation a single 1 m × 1 m square was excavated below the perceived end of the LSA, into what were presumed to be Middle Stone Age (MSA) artefact-bearing layers. The excavator’s original division between the LSA and MSA layers of Klein Kliphuis is retained here as a useful distinction, though it is the contention of this paper that some of the artefacts excavated from below this division are of LSA association. Information pertaining to the LSA component of the site was published (van Rijssen 1992), but although the MSA component was sorted, it was neither analysed in depth nor published. Analysis conducted in 2005 and 2006 suggests the presence of a stratified sequence at Klein Kliphuis which appears to parallel part of the sequence at Diepkloof Rock Shelter some 50 km to the southwest. This paper discusses the layers at Klein Kliphuis in terms of their culture–historical affiliation, based on comparison with published data from better resolved MSA excavations elsewhere.

Implications of Nubian-Like Core Reduction Systems in Southern Africa for the Identification of Early Modern Human Dispersals

Lithic technologies have been used to trace dispersals of early human populations within and beyond Africa. Convergence in lithic systems has the potential to confound such interpretations, implying connections between unrelated groups. Due to their reductive nature, stone artefacts are unusually prone to this chance appearance of similar forms in unrelated populations. Here we present data from the South African Middle Stone Age sites Uitpanskraal 7 and Mertenhof suggesting that Nubian core reduction systems associated with Late Pleistocene populations in North Africa and potentially with early human migrations out of Africa in MIS 5 also occur in southern Africa during early MIS 3 and with no clear connection to the North African occurrence. The timing and spatial distribution of their appearance in southern and northern Africa implies technological convergence, rather than diffusion or dispersal. While lithic technologies can be a critical guide to human population flux, their utility in tracing early human dispersals at large spatial and temporal scales with stone artefact types remains questionable.

Mid to late quaternary landscape and environmental dynamics in the Middle Stone Age of southern South Africa

The southern Cape of South Africa hosts a remarkably rich Middle Stone Age (MSA) archaeological record. Many of the associated caves and rock shelters are coastal sites, which contain evidence for varied occupational intensity and marine resource use, along with signs of notable landscape, environmental, and ecological change. Here, we review and synthesize evidence for Quaternary landscape and climatic change of relevance to the southern Cape MSA. We seek to highlight the available data of most relevance to the analysis and interpretation of the region’s archaeological record, as well as critical data that are lacking. The southern Cape MSA occupation spans the full range of glacial-interglacial conditions (i.e., 170–55 ka). It witnessed marked changes in coastal landscape dynamics, which although driven largely by global eustatic sea level changes, were modulated by local-scale, often inherited, geological constraints. These prevent simple extrapolations and generalizations concerning paleolandscape change. Such changes, including pulses of coastal dune activity, will have directly influenced resource availability around the region’s archaeological sites. Evidence for paleoclimatic change is apparent, but it is scarce and difficult to interpret. It is likely, however that due to the same diversity of rainfall sources influencing the region today, compared to parts of the continental interior, the southern Cape climate was relatively equable throughout the last 150 kyr. The region’s paleoecology, particularly in relation to the coastal plains exposed during sea level lowstands, is a key element missing in attempts to synthesize and model the resources available to occupants of this region. Technology, settlement, and subsistence probably changed in response to these paleoclimate/landscape adjustments, but improvements in baseline archaeological and paleoenvironmental data are required to strengthen models of ecosystem variation and human behavioral response through the MSA.

Primordialism and the ‘Pleistocene San’ of southern Africa

Abstract Analogies are an important tool of archaeological reasoning. The Kalahari San are frequently depicted in introductory texts as archetypal, mobile hunter-gatherers, and they have influenced approaches to archaeological, genetic and linguistic research. But is this analogy fundamentally flawed? Recent arguments have linked the San populations of southern Africa with the late Pleistocene Later Stone Age (c. 44 kya) at Border Cave, South Africa. The authors argue that these and other claims for the Pleistocene antiquity of modern-day cultures arise from a fundamental misunderstanding of the nature of cultural and archaeological taxonomies, and that they are a misuse of analogical reasoning.

Pleistocene archaeology and chronology of putslaagte 8 (PL8) Rockshelter, Western Cape, South Africa

We report on excavations of a small rock shelter — Putslaagte 8 (PL8) — located on the arid interior fringe of South Africa’s Fynbos biome. The shelter preserves a long sequence of Holocene and late Pleistocene occupation dating back beyond 75,000 years BP. This paper presents data on the technological, faunal and chronological sequence. Occupation is markedly pulsed and includes three late Pleistocene Later Stone Age (LSA) units (macrolithic, Robberg and early LSA), as well as several distinct Middle Stone Age (MSA) components from Marine Isotope Stage (MIS) 3–5. Pulsing may reflect the arid and possibly marginal environments in which the shelter is situated, and to that end some elements of the sequence contrast with occupational patterns towards the coast. Viewed in a regional setting PL8 suggests: 1) complementarity of resource movements between the coast and interior in terminal MIS 2; 2) distinctions in material selection, and possibly technology, between the coast and interior in earlier MIS 2; 3) an MSA lasting to at least 40,000 years before present; 4) a weak Howiesons Poort and post-Howiesons Poort in the interior; 5) possibly distinct periods of denticulate manufacture within the MIS 5 MSA; 6) highly localised patterns of material acquisition in the earlier MSA.

Why was silcrete heat-treated in the Middle Stone Age? An early transformative technology in the context of raw material use at Mertenhof Rock Shelter, South Africa

People heat treated silcrete during the Middle Stone Age (MSA) in southern Africa but the spatial and temporal variability of this practice remains poorly documented. This paucity of data in turn makes it difficult to interrogate the motive factors underlying the application of this technique. In this paper we present data on heat treatment of silcrete through the Howiesons Poort and post-Howiesons Poort of the rock shelter site Mertenhof, located in the Western Cape of South Africa. In contrast to other sites where heat treatment has been documented, distance to rock source at Mertenhof can be reasonably well estimated, and the site is known to contain high proportions of a diversity of fine grained rocks including silcrete, hornfels and chert at various points through the sequence. Our results suggest the prevalence of heat treatment is variable through the sequence but that it is largely unaffected by the relative abundance of silcrete prevalence. Instead there is a strong inverse correlation between frequency of heat treatment in silcrete and prevalence of chert in the assemblage, and a generally positive correlation with the proportion of locally available rock. While it is difficult to separate individual factors we suggest that, at Mertenhof at least, heat treatment may have been used to improve the fracture properties of silcrete at times when other finer grained rocks were less readily available. As such, heat treatment appears to have been a component of the MSA behavioural repertoire that was flexibly deployed in ways sensitive to other elements of technological organisation.

The hybrid origin of "modern" humans

Recent genomic research has shown that hybridization between substantially diverged lineages is the rule, not the exception, in human evolution. However, the importance of hybridization in shaping the genotype and phenotype of Homo sapiens remains debated. Here we argue that current evidence for hybridization in human evolution suggests not only that it was important, but that it was an essential creative force in the emergence of our variable, adaptable species. We then extend this argument to a reappraisal of the archaeological record, proposing that the exchange of cultural information between divergent groups may have facilitated the emergence of cultural innovation. We discuss the implications of this Divergence and Hybridization Model for considering the taxonomy of our lineage.