Hunter-gatherer subsistence-settlement strategies are discussed in terms of differing organizational components, "mapping-on" and "logistics," and the consequences of each for archaeological intersite variability are discussed. It is further suggested that the differing strategies are responsive to different security problems presented by the environments in which hunter-gatherers live. Therefore, given the beginnings of a theory of adaptation, it is possible to anticipate both differences in settlement-subsistence strategies and patterning in the archaeological record through a more detailed knowledge of the distribution of environmental variables.

A combination of archeological and ethnohistorical evidence indicates that, over an approximately 8,000-year period, from the beginning of the Holocene until European explorers began arriving in the eighteenth century, the societies of Tasmania lost a series of valuable skills and technologies. These likely included bone tools, cold-weather clothing, hafted tools, nets, fishing spears, barbed spears, spear-throwers, and boomerangs. To address this puzzle, and the more general question of how human cognition and social interaction can generate both adaptive cultural evolution and maladaptive losses of culturally acquired skills, this paper constructs a formal model of cultural evolution rooted in the cognitive details of human social learning and inference. The analytical results specify the conditions for differing rates of adaptive cultural evolution, and reveal regimes that will produce maladaptive losses of particular kinds of skills and related technologies. More specifically, the results suggest that the relatively sudden reduction in the effective population size (the size of the interacting pool of social learners) that occurred with the rising ocean levels at the end of the last glacial epoch, which cut Tasmania off from the rest of Australia for the ensuing ten millennia, could have initiated a cultural evolutionary process that (1) kept stable or even improved relatively simple technological skills, and (2) produced an increasing deterioration of more complex skills leading to the complete disappearance of some technologies and practices. This pattern is consistent with the empirical record in Tasmania. Beyond this case, I speculate on the applicability of the model to understanding the variability in rates of adaptive cultural evolution.

It is argued that archaeology has made few contributions to the general field of anthropology with regard to explaining cultural similarities and differences. One major factor contributing to this lack is asserted to be the tendency to treat artifacts as equal and comparable traits which can be explained within a single model of culture change and modification. It is suggested that “material culture” can and does represent the structure of the total cultural system, and that explanations of differences and similarities between certain classes of material culture are inappropriate and inadequate as explanations for such observations within other classes of items. Similarly, change in the total cultural system must be viewed in an adaptive context both social and environmental, not whimsically viewed as the result of “influences,” “stimuli,” or even “migrations” between and among geographically defined units.

Three major functional sub-classes of material culture are discussed: technomic, socio-technic, and ideo-technic, as well as stylistic formal properties which cross-cut these categories. In general terms these recognized classes of materials are discussed with regard to the processes of change within each class.

Using the above distinctions in what is termed a systemic approach, the problem of the appearance and changing utilization of native copper in eastern North America is discussed. Hypotheses resulting from the application of the systemic approach are: (1) the initial appearance of native copper implements is in the context of the production of socio-technic items; (2) the increased production of socio-technic items in the late Archaic period is related to an increase in population following the shift to the exploitation of aquatic resources roughly coincident with the Nipissing high water stage of the ancestral Great Lakes; (3) this correlation is explicable in the increased selective pressures favoring material means of status communication once populations had increased to the point that personal recognition was no longer a workable basis for differential role behavior; (4) the general shift in later periods from formally “utilitarian” items to the manufacture of formally “nonutilitarian” items of copper is explicable in the postulated shift from purely egalitarian to increasingly nonegalitarian means of status attainment.

The cultural aspect of the processes responsible for forming the archaeological record is argued to be an underdeveloped branch of archaeological theory. A flow model is presented by which to view the "life history" or processes of systemic context of any material element. This model accounts for the production of a substantial portion of the archaeological record. The basic processes of this model are: procurement, manufacture, use, maintenance, and discard. Refuse labels the state of an element in archaeological context. The spatial implications of the model suggest a largely untapped source of behavioral information. Differential refuse disposal patterns are examined as they affect artifact location and association. The meaning of element relative frequencies in refuse is discussed.

The results of a study on the relationship between stylistic variation in Kalahari San projectile points and aspects of San social organization are summarized. Five issues relevant to archaeology are discussed in light of the San data: (1) stylistic behavior and the different aspects of style, (2) which items of material culture carry social information and why, (3) which attributes on San projectile points carry social information, (4) what the results of the analysis of stylistic variation in projectile points imply for current methods of stylistic analysis and interpretation, and (5) the correspondence between style in San projectile points and San organization.

Detailed behavioral observations permitted the dimensional analysis of formation processes operative on the Mask site, a Nunamiut Eskimo hunting stand. Activity structure, technological organization, disposal mode, and spatial organization were all seen as behavioral dimensions that could each vary, altering the patterns of assemblage content and spatial disposition at an archaeological site. These ethnoarchaeological experiences were then contrasted with those recently reported by John Yellen (1977), and a critical evaluation of his “conclusions” was conducted from the perspective of the Eskimo experience. It was pointed out that basic differences in philosophy and approach to research largely conditioned the contrasting character of the conclusions drawn from the different experiences.

Ethnographic examples of stone-tool makers in Australia and archaeological examples from three different areas in the western United States indicate that the availability of lithic raw materials is an important variable conditioning stone-tool production technology. Attributes of availability such as abundance and quality of lithic raw materials condition the production of formal- vs. informal-tool types. Poor-quality raw materials tend to be manufactured into informal-tool designs. High-quality lithic raw materials tend to be manufactured into formal-tool designs when such materials occur in low abundance. When high-quality materials occur in great abundance both formal- and informal-tool designs are manufactured. Other factors, such as residential mobility or sedentism, are found to be less-important determinates of lithic-production technology.

Plants metabolize carbon dioxide photosynthetically either through a 3-carbon (Calvin) or 4-carbon pathway. Most plants are of the C-3 type; C-4 plants are primarily grasses adapted to hot, arid environments. Since C-4 plants have a higher 13C/12C ratio than C-3 plants, animals and humans with a significant C-4 plant food-intake will have higher 13C/12C ratios as well. Maize is a C-4 plant, hence maize cultivators living in predominantly C-3 plant environments should show significant isotopic differences from local hunter-gatherers in their skeletal remains; the importance of maize in their diet should also be measurable. The practicability of this method is demonstrated for New York State archaeological materials and wider implications are mentioned.

Archaeologists frequently explain tool curation by its efficiency. Such explanations ignore the fact that curation is a complex activity and that its component parts are efficient in different ways. I argue that the nature and distribution of lithic resources critically affect technological efficiency and I discuss two aspects of curation, maintenance and recycling, asserting that they are responses to raw material shortages. Shortages result from regional geological conditions and from behavior patterns that restrict access to raw material in certain contexts. Ethnographic and archaeological examples support this hypothesis and highlight the relationship between subsistence-settlement organization, raw material distribution, and technology.

Research in experimental archaeology, ethnoarchaeology, geoarchaeology, and vertebrate taphonomy has appreciably increased our general understanding of the formation processes—cultural and natural—of archaeological sites. In synthesizing some of these recent advances, this paper focuses on the traces of artifacts and characteristics of deposits that can be used to identify the formation processes of specific deposits. These observational phenomena are grouped into three basic categories that structure the presentation: (1) simple properties of artifacts, (2) complex properties of artifacts, and (3) other properties of deposits. Also considered is the way in which prior knowledge can help the archaeologist to cope with the large number of processes and the nearly infinite combination of them that may have contributed to the specific deposits of interest. Several analytical strategies are proposed: (1) hypothesis testing, (2) multivariate analysis, and (3) use of published data to evaluate formation processes. This paper demonstrates that the identification of formation processes, which must precede behavioral inference and be accomplished by any research endeavor that uses evidence from the archaeological record, can become practical and routine.

Several independent trajectories of subsistence intensification, often leading to agriculture, began during the Holocene. No plant-rich intensifications are known from the Pleistocene, even from the late Pleistocene when human populations were otherwise quite sophisticated. Recent data from ice and ocean-core climate proxies show that last glacial climates were extremely hostile to agriculture—dry, low in atmospheric CO2, and extremely variable on quite short time scales. We hypothesize that agriculture was impossible under last-glacial conditions. The quite abrupt final amelioration of the climate was followed immediately by the beginnings of plant-intensive resource-use strategies in some areas, although the turn to plants was much later elsewhere. Almost all trajectories of subsistence intensification in the Holocene are progressive, and eventually agriculture became the dominant strategy in all but marginal environments. We hypothesize that, in the Holocene, agriculture was, in the long run, compulsory. We use a mathematical analysis to argue that the rate-limiting process for intensification trajectories must generally be the rate of innovation of subsistence technology or subsistence-related social organization. At the observed rates of innovation, population growth will always be rapid enough to sustain a high level of population pressure. Several processes appear to retard rates of cultural evolution below the maxima we observe in the most favorable cases.

Design engineers share archaeologists' interest in material culture, but unlike archaeologists, engineers have developed concepts for determining the suitability of technical systems to perform specific tasks. Given the difficulty archaeologists face in developing theories of material culture, I suggest that guiding principles of engineering design offer potentially useful insights.

In this article I discuss two design alternatives for optimizing the availability of any technical system - reliability and maintainability. Reliable systems are made so that they can be counted on to work when needed. Maintainable ones can easily be made to function if they are broken or not appropriate to the task at hand. Because these design alternatives have markedly different optimal applications and observably different physical characteristics, archaeologists can link the design of prehistoric weapons to environmental constraints and to specific hunting strategies. Ethnographic examples indicate that primitive hunters do use both reliable and maintainable systems in optimal situations.

Hunter-gatherer adaptations to long-term fluctuations in regional resource structure require mechanisms to cope with periodic subsistence stresses. Among documented groups, a common response to such stress is temporary movement into adjacent occupied areas-moving in with "relatives" when things go wrong. However, in the case of early (ca. 12,000-10,000 B.P.) Paleoindian groups in the Americas, the availability of neighboring groups with a detailed knowledge of local resource geography could not be relied upon. Post-Pleistocene environmental changes and the low initial population of the New World are important factors conditioning a lifeway characterized by a dependence on hunting (though not exclusively of megafauna), and by high residential, logistical, and range (territorial) mobility. Early Paleoindian groups had to adopt a subsistence technology that could be employed regardless of the specific resource microstructure. In some regards, Paleoindians seem to have behaved like tropical foragers while in others like arctic collectors. Use of high quality lithic raw materials from large quarry sources, reliance on a bifacial technology, limited use of caves and rockshelters, and a low level of processing of food products for storage all may be indicative of such a subsistence technology, which would have been unlike that of any modern hunter-gatherers.

The statistical technique of this paper is based upon the empirically established fact that over the course of time pottery types come into and go out of general use by a given group of people. It is further based upon the established fact that in cultures where chronology has been determined the differential use of types takes on a form illustrated in Figure 89. The data of this diagram are hypothetical, the purpose being merely to illustrate the present discussion.

Three different sorts of bifacial tools-by-products of the shaping process, cores, and long use-life tools-are used to consider the role mobility plays in producing variability in hunter-gatherer lithic technologies. The relations among tool roles, raw-material distribution, and mobility as well as the archaeological consequences of the different roles are key factors. An examination of temporal trends in the use of bifacial implements in the Carson Sink of western Nevada shows how the proposed perspective on lithic technology can help to elucidate change in mobility strategies. A shift from the use of bifaces as cores to an infrequent use of bifaces as tools suggests a shift from logistical to short-term residential use of the raw-material-poor Carson Sink; a later shift to the use of small, frequently unifacial, nonresharpenable points may indicate a shift to target-specific hunting strategies.

The animal body-part utility indices developed by Lewis Binford have been used to interpret faunal assemblages ranging from Plio-Pleistocene sites in East Africa to a late prehistoric bison kill in the High Plains of North America. Little attention, however, has been placed on refining or further developing these scales of economic utility. We examine Binford's derivation of the modified general utility index (MGUI) and demonstrate that it is needlessly complex. A nearly identical index, the food utility index (FUI), is presented. It simply scales variation in the amount of meat, marrow, and bone grease associated with different caribou body parts. We then use the insights provided by this simple scale to explore relations among economic utility, differential body-part representation, and human decision making.

Certain aspects of what archaeologists have traditionally called stylistic variation can be understood as the result of the introduction of selectively neutral variation into social-learning populations and the sampling error in the cultural transmission of that variation (drift). Simple mathematical models allow the deduction of expectations for the dynamics of these evolutionary mechanisms as monitored in the archaeological record through assemblage diversity and interassemblage distance. The models are applied to make inferences about the causes of change in decorative diversity and interassemblage distance for Woodland ceramics from Illinois.

Radiocarbon dates can provide an effective overview of regional trends in non-complex societies when treated in a quantitative manner. In spite of intervening biases, numbers of radiocarbon dates should reflect the patterns of occupation across time. Using the date record of preceramic Perú, I illustrate very different radiocarbon trends for highland and coastal zones. These suggest exponential growth, equilibrium, and altitude shift for the occupations of coastal, puna, and highland valley regions. Biases caused by variation in temporal and geographic investigation, and the effects of sea-level rise are considered, but I argue that general occupational patterns overshadow distortions of the date record.

It is widely believed that the design of transported artifacts and toolkits employed by mobile populations is influenced by two main factors, portability and potential utility. Choices about the kinds of artifacts to carry around can be modeled as an optimization problem, in which it is beneficial to obtain the greatest potential utility for the minimum total weight. This study approaches the problem analytically, making a few simple assumptions about artifact geometry and the relations between utility and artifact size. If artifact utility is calculated as a function of potential for renewal, transported toolkits should consist entirely of relatively small finished tools. Moreover, most gains in durability or multifunctionality that require increases in overall size are outweighed by increased transport cost. Inconsistencies between these expectations and ethnographic and archaeological observations point to situations in which artifact functionality is more closely constrained by overall size or mass.

Pleistocene societies are viewed in this paper as manifestations of band society from which Paleolithic archaeologists can generate hypotheses about this cultural system and against which they can evaluate the validity of general cultural explanations. A general model is posited toward the isolation of Paleolithic societies in the archaeological record. Their numerical size is predicted from Monte Carlo simulations of model populations, and ways are discussed in which distinguishable equilibrium states of such societies can be predicted in time and space. Under the assumption of maximal constraints, simulations are used to predict the size and longevity of social units. The frequency of settlements produced during an equilibrium state of a society is simulated and the utility of survey for activity areas outside the settlements is demonstrated. The models developed in this paper are intended to stimulate deductive research in Paleolithic archaeology.