The devolution of mudbrick: ethnoarchaeology of abandoned earthen dwellings in the Bolivian Andes

This ethno-geoarchaeological study considers the formation of archaeological deposits through a study of abandoned contemporary mudbrick structures on the Taraco Peninsula, Bolivia. The study site was a domestic compound with rooms for different functions that had been abandoned for over 50 years. Structures were in variable states of decay in terms of roof cover, walling integrity and abandonment fills. Geoarchaeological samples were collected from intact and weathered adobes, earthen hearths, mud plaster, and flooring. Adobes and mud plaster were locally derived from topsoil containing archaeological sediments with added gravel and plant temper. This study found a relatively light anthropogenic signature for decayed earthen houses.Rising damp exfoliated mud plaster despite un-mortared cobble wall foundations. Organic matter from roof fall attracted thriving soil faunal populations, which furthered site destruction through bioturbation, particularly packed earth floors. Sediments derived from weathered mudbrick retained little evidence of prior use as construction materials unless exposed to heat. Sediments exposed to high-temperatures produced the most distinctive rubified features but were structurally compromised. Isolated thermal features from decomposed adobe would not be distinguishable from other hearth types. Adobes exposed to low or moderate heat had few distinctive features in thin section. Intact adobes and floors that were not exposed to heat have fewer pores than natural sediments and distinctive grass inclusions. These adobes disarticulated into loose sediments when exposed to weathering. Adobe fall outside the crumbling structures blended into topsoil.This study sheds light on functional attributes of pre-Columbian construction practices. Thick, fine-textured sterile flooring is commonly encountered in the study region. This would control bioturbation from roof fall in a previous occupation enabling reconstruction in abandoned dwellings. In contrast to the contemporary dwelling, prehistoric mortared cobble foundations would resist rising damp. Cobbles without mortar may relate more to design and construction than durability. These contrasts between contemporary and prehistory construction practices reflect differences in the design, construction costs and functional use-life of adobe structures.     

Recent carbon isotope research and its implications for African archaeology

A number of new developments in the carbon isotope field are reviewed, some of these having immediate and others potential application to African archaeology. Mass spectrometric analysis of¹³C/¹²C ratios in human and animal bone collagen makes it possible to reconstruct prehistoric foodwebs and to draw conclusions about dietary adaptations. Alternatively, where dietary behaviour is known, analysis of the bone of certain animal species allows for reconstruction of past environments. Ratio mass spectrometers are widely available in research institutions, and provided that the proper techniques for sample preparation are followed, this method of analysis should be of immediate use to most Africanists. It is already making an impact on African archaeology. The development of accelerator-based or high energy mass spectrometry (HEMS) radiocarbon dating provides the potential for extending the method back to 100,000 years, particularly in the case of bone samples. Practical applications, however, are still a few years off. In the immediate future HEMS dating is likely to be applied to small samples of ages less than 50,000 years. In competition with HEMS is the use of mini-counters for conventional radiocarbon dating of small samples. This procedure is available in a few laboratories with more under development. Dating of small samples has potential applications in many areas, specifically in the direct age measurement of critical specimens as opposed to the dating of associated materials.     

Lithostratigraphy of Border Cave, KwaZulu, South Africa: a Middle Stone Age sequence beginning c. 195,000 b.p.

Border Cave is well-known for its Middle Stone Age (MSA) sequence and associated hominids, as well as for the earliest demonstrable Later Stone Age (LSA) (c. 38,000 b.p.) strata in southern Africa. Detailed lithostratigraphic and sedimentological study permits identification of 8 Pleistocene sedimentary cycles, including 6 major cold phases and 2 intervening weathering horizons. The 2 youngest cold phases are associated with the LSA and have 8 ¹⁴C dates 38,600-13,300 b.p. By gauging sedimentation rates in finer and coarser sediments, duration of sedimentary breaks, and allowing for differential compaction, the excellent radiocarbon framework provided by 28 available ¹⁴C dates can be extrapolated to the 6 cold intervals and 2 palaeosols that are older than 50,000 b.p. These clearly span oxygenisotope stages 4, 5 and 6, placing the base of the MSA deposits at c. 195,000 b.p., Homo sapiens sapiens at c. 90,000–115,000 b.p. and the sophisticated, microlithic “Howieson's Poort” industry at 95,000 b.p. These results require radical reassessment of the age and nature of the MSA complex and of the earliest evolution of anatomically-modern people.     

Terr(it)or(ies) of Peace? The Congolese Mining Frontier and the Fight Against “Conflict Minerals”

This article traces the geography of the “conflict minerals” campaign and its impact on artisanal mining in the eastern Democratic Republic of the Congo, a region that currently emerges as a pioneer case of traceability and due diligence efforts with regard to the exploitation and trade in tantalum, tungsten and tin. We subsequently analyse the opening and attempted closure of the Congolese resource frontier in the context of recent market reform, and we describe how this process has accompanied a transnational corporate–government nexus bent on monopolising Congo's artisanal 3 T resources. Specifically, we argue how the conflict minerals campaign and its implementation “on the ground” has brought about a harmful, disruptive logic for an artisanal mining sector that is notoriously categorised as unruly, illegal, and informal, but of which upstream stakeholders have in practice been jeopardised by transnational reform. We thus shift the attention from questions on the political economy of “resource wars” towards a deeper understanding of the intersecting spaces of production and regulation that underpin formalisation and traceability of “conflict minerals” in this protracted conflict environment.     

New Research on the Late Prehistoric Coastal Polities of Northern Peru

Previously, the Chimú empire was thought to have dominated the north coast of Peru during the Late Intermediate period, virtually to the exclusion of other polities. However, new research on sites from this period has not only changed perspectives on the Chimú, but also shed light on two other important coastal polities: the Lambayeque/Sicán and the Casma, providing insights with the potential to reshape our understanding of the development of urbanism and the Andean state. This article presents a critical summary of recent literature, fieldwork, and discoveries. Analyses of these new data address a wide range of topics that can be loosely grouped into four major areas: complexity in political organization and the geopolitical landscape, variations in the urban environment, the intensification of trade and exchange, and dynamic expressions of religion and ideology. The latest interpretation of the north coast Late Intermediate period is a story of three major, competing polities that were eventually subsumed under one.     

Gendering the city: the lived experience of transforming cities,urban cultures and spaces of belonging

Debates centred on ‘planetary urbanisation’ have raised questions over the adequacy of existing theories and epistemologies to explain the quantitative and qualitative transformations of cities. However, this theorization of the urban has met with opposition from post-colonial and feminist researchers amongst others. The comparative, empirical research in this collection, from Bolivia, India and Turkey, highlights that the city remains an important analytical and concrete framework, demarcated by contingency and cultural change through which residents must navigate. In particular we focus on the specificity of women’s lives and their capacity to problematise universalist theory, documenting their interrogation of simplistic binaries such as modern/traditional; their innovative approaches to informal settlement, housing and markets; their production of urban knowledge in order to negotiate the city; and processes and practices of mobility, experimentation, risk taking and aspiration that contest or support a myriad of urban imaginaries. Whilst not rejecting the need for theories that allow comparative perspectives on cities, our conclusions underscore the importance of recognising the multiple logics that generate city space and urban cultures, and the consequent need to parochialise the empirical basis of theories that claim to be global in outreach.     

Consequences of conquest? The analysis and interpretation of subadult trauma at Puruchuco-Huaquerones, Peru

This paper examines bioarchaeological evidence of violence and traumatic injury on subadult skeletal remains from two Late Horizon (A.D. 1470-1540) cemeteries within the archaeological zone of Puruchuco-Huaquerones, Peru. Here we present the frequency and types of traumatic lesions on the 242 subadults analyzed. We observed significant increases in the frequency of subadult trauma, particularly among the burials associated with Spanish Conquest. Specifically, we noted a statistically significant increase in the frequency of cranial trauma in a subsample of individuals from one of two cemeteries at the site, 57AS03. These perimortem cranial injuries suggest an intensification of violence and lethality that may have affected the children from this community. We then discuss the biocultural implications of this analysis within the context of Spanish invasion and conquest.