Optimal-foraging theory and the concept of energetic efficiency have been used in archaeology for over a decade, usually to explore subsistence behavior. People, however, made choices for energy expenditure in other areas of culture, including lithic technology. It is suggested that a shift in the allocation of energy as an adaptive response to changes in social organization caused the widely noted decline in formal tool types and stone-tool refinement in the late prehistoric periods in eastern North America. Data from an Upper Mississippian village are used to demonstrate the economic use of poor-quality lithic raw material. A bipolar technique was used to produce flake blanks for triangular projectile points as well as a peculiar but common Upper Mississippian tool, the humpback biface. It is suggested that bipolar reduction and other lithic efficiency and economizing strategies are indicators of stress on the energy budgets of human populations.
The histories of maize utilization in eastern North America have been substantially revised recently, primarily because of the analysis of charred cooking residues encrusted on pottery. A multifaceted research strategy of bulk δ13C assays coupled with accelerator mass spectrometry radiocarbon data and microbotanical evidence can yield coherent regional maize use histories. Bulk δ13 C assay interpretation complications include (1) variations among vessels by site, (2) a potential for false negatives, and (3) a wide range of variation potentially present for any given time period. Regional histories using this approach can be quite variable without appropriate use of multiple lines of evidence.
Mortuary archaeology has always been viewed as one of the most richly evocative sources of evidence for past social systems, particularly those without writing. However, the political context within which archaeology developed as a discipline, especially in countries with a colonial past, has made it difficult or impossible for the burial record to be utilized to its full potential. Ironically, this moratorium on the use of human remains for research purposes has been accompanied by the development of new analytical techniques, including ancient DNA (aDNA) and chemical analysis of skeletal material, which provide powerful tools for understanding complex social relationships and mobility within and between ancient populations. This review focuses on the United States and Europe because of the close relationship between their scholarly communities, as a result of which the limits placed on mortuary archaeology in the United States has had and continues to have a direct impact on the development of the discipline in numerous European countries. The inferential potential of bioarchaeology in particular is discussed against the backdrop of these sociohistorical developments, and the case studies presented highlight the powerful array of interdisciplinary approaches now being brought to bear on our understanding of ancient social systems.
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