Later Stone Age Technological Strategies at Blydefontein Rock Shelter, South Africa
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Journal of Anthropological Archaeology 24 (2005) 193–226 www.elsevier.com/locate/jaa Coping with risk: Later stone age technological strategies at Blydefontein Rock Shelter, South Africa C. Britt Bousman Department of Anthropology, Center for Archaeological Studies, Texas State University-San Marcos, 601 University Drive, San Marcos, TX 78666-4616, USA Received 19 January 2005; revision received 18 March 2005 Available online 11 July 2005 Abstract I use Later Stone Age artifacts and faunal remains from Blydefontein Rock Shelter in the eastern Karoo, South Africa to investigate the interaction between risk and hunter–gatherer technological organization. ModiWcations in stone-tool repair and replacement are inXuenced by changes in past environments, resources, and the economic and set- tlement strategies of these Later Stone Age hunter–gatherers. The technological approaches range from time-minimiza- tion tactics to resource-maximization tactics. Time-minimization tactics favor the intense curation of extractive tools and the expedient use of maintenance tools, while resource-maximization tactics employ a more rapid replacement of extractive tools coupled with intense curation of maintenance tools. Time-minimization tactics occur with lower risk wetter conditions and the selection of larger animals for prey, while resource-maximization tactics correspond to higher risk conditions during drier periods and the more intensive exploitation of smaller animals. EYcient technologies were also employed for the rapid production of backed microlithic tools, but this does not appear to be in response to eco- nomic or environmental factors. 2005 Elsevier Inc. All rights reserved. Introduction hunter–gatherers manipulated these strategies to cope with changing conditions through time. Tactical shifts In the Karoo of South Africa, Later Stone Age (LSA) coincide with environmental changes and with oscillations hunter–gatherers occupied Blydefontein Rock Shelter in the faunal remains. The correspondence of technologi- sporadically in the Late Pleistocene and throughout the cal indicators with the economic and paleoenvironmental Holocene (Fig. 1). Discarded stone tools, lithic manufac- records suggests that short-term Xuctuations in food turing debris, bone refuse, and hearths scattered through- availability and economic risk inXuenced hunter–gatherer out the stratiWed rock shelter’s deposits, as well as the technological responses. occasional potsherd in the later components, represent the First, I will discuss the theoretical foundations of this enduring record of their encampments. This study exam- paper in terms of risk and organization of technology ines ways by which these hunter–gatherers organized their among hunter–gatherers, then present the South African technological strategies, especially regarding the design, evidence for Later Stone Age technology, and Wnish with use and maintenance of their stone tools, and how these an analysis of the Blydefontein Rock Shelter data. The approach taken here uses optimal foraging theory (Bettinger, 1991; Smith and Winterhalder, 1992; E-mail address: [email protected]. Winterhalder, 2001) and especially those tenets 0278-4165/$ - see front matter 2005 Elsevier Inc. All rights reserved. doi:10.1016/j.jaa.2005.05.001 194 C.B. Bousman / Journal of Anthropological Archaeology 24 (2005) 193–226 Fig. 1. Map of Southern Africa showing location of Blydefontein Rock Shelter, signiWcant LSA sites, and landmarks. concerned with risk management (Cashdan, 1990; risk solely in terms of likelihood-of-loss (cf. Jochim, 1976). Torrence, 1989, 2001; Wiessner, 1982). Risk has many However, as Torrence (1989), and Bamforth and Bleed diVerent meanings, but in a general sense, scholars view (1997) persuasively argue, it is not only the frequency but risk either as a measure of unpredictable physical peril or also the severity of shortfalls, and thus the costs of over- uncertain economic returns. The following discussion only coming these shortfalls that provide the most important considers risk in terms of uncertain economic returns. limiting factors to human survival. Bamforth and Bleed (1997, p. 117) present a simple analogy that is worth Economic risk and hunter–gatherer technology repeating. The probability of falling oV a tightrope is the same whether it is 1 or 100 ft. above the ground, but the Economic risk gauges resource availability in terms of costs of falling oV the two tightropes diVer dramatically. abundance, diversity, and spatial and temporal distribu- Backup resources also diminish the cost-of-loss tions (Cashdan, 1990). Torrence (1989), who published (Bamforth and Bleed, 1997). For example, hunter–gath- one of the Wrst and best argued cases illustrating the inXu- erers in far northern latitudes often focus their seasonal ence of risk on technological strategies, partitioned risk economic pursuits on one or two resources with few, if into two components: the probability of an economic any, available backup resources (Kelly, 1995). Risks are shortfall (likelihood-of-loss) and the severity of an eco- diVerent in other areas such as Southern Africa where nomic shortfall (cost-of-loss). In hunter–gatherer econo- hunter–gatherers exploit a wider variety of resources if mies, the likelihood and severity of shortfalls are preferred food sources fail. This is not to say that areas determined by a multitude of factors that include seasonal like Southern Africa are not risky and that the potential climatic patterns, unpredictable weather, prey density and for starvation was not a serious factor for prehistoric their ecological relationships, and the speciWc hunting and hunter–gatherers, but the structure of risk is diVerent. In gathering tactics that include mobility and technology, as this paper, I assume that the timing and severity of well as the social strategies that inXuence access to food shortfalls are the two harshest “selectional forces” that (Wilmsen and Durham, 1988). Most archaeologists view inXuence technology among hunters–gatherers. C.B. Bousman / Journal of Anthropological Archaeology 24 (2005) 193–226 195 Wiessner (1977, 1982) identiWes four generalized Using paleoenvironmental data as a proxy measure strategies used by hunter–gatherers to cope with risk: (1) of risk can lead to erroneous assessments. Minc and prevention-of-loss, (2) transfer-of-loss, (3) food storage, Smith (1989) provide an example of potential pitfalls. and (4) storage though social obligations. Bamforth and Using tree-ring records, they reconstruct resource Xuctu- Bleed (1997) argue that archaeologists have spent too ations for neighboring inland and coastal areas in much eVort investigating prevention-of-loss strategies, Northern Alaska during the historic period, and show and other coping strategies should be our focus. Trans- that risk proWles in these two adjacent areas vary fer-of-loss (sharing within a single group) and storage inversely with climatic conditions. Dry, warm conditions through social obligations (sharing between groups allow greater caribou calf survival in winter and increase using reciprocal exchange systems such as hxaro) do not productively of caribou hunting for inland groups, while necessarily require technological devices (Wiessner, the same conditions decrease the hunting success of 1982), and these can be diYcult to monitor with archae- bowhead whale and ringed seal hunting at the coast due ological evidence. to the early breakup of sea ice. This inverse correlation Food storage often does involve technological strate- with climate shows that simple equations with proxy evi- gies (Testart, 1982; Wiessner, 1982). For example, closer dence can be misleading. Care must be taken, but rea- to the South African southern coast, Holocene sites such sonable measures can be made with an understanding of as Melkhoutboom and Boomplaas have storage pits local paleoecology. with preserved seeds and corms (H.J. Deacon, 1976, 1979; Mitchell, 2002, pp. 175–176, 178), but hunter–gath- Organization of technology erers in the Interior Plateau near Blydefontein never relied on storage intensively enough to develop elaborate Archaeologists have introduced a series of concepts technological devices. Many other hunter–gatherer soci- used in the study of technological organization (see eties follow a similar pattern. Consequently, this paper Bousman, 1993 for more detailed summary). Binford returns to prevention-of-loss strategies, especially those and Binford (1966) distinguish between extractive and that inXuence hunter–gatherer technologies, as a valid maintenance tasks and suggest that technology was topic for analysis. designed to address the needs of these two distinct types While risk is diYcult to monitor with ethnographic or of tasks. We can then classify tools as to their role in archaeological data, a few attempts to document risk these primary functions as either extractive or mainte- have been made over the last 20 or so years (Ambrose nance tools. Extractive tools are those used to obtain and Lorenz, 1990; Dyson-Hudson and Smith, 1978). One food and maintenance tools are those used to manufac- limitation is that very few modern hunter–gatherer stud- ture or repair other technological devices. ies report environmental information in great enough Later, Binford (1973) introduced the concept of detail from which risk can be assessed, but see Wilmsen design goals and made a contrast between expedient and and Durham (1988) and Kent (1996) for notable excep- curated tools. Expedient tools are those