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Publication date: August 2016Source:Journal of Archaeological Science, Volume 72 Author(s): Vladimír Sládek, Martin Hora, Kristýna Farkašová, Thomas R. RocekThis paper proposes and tests the idea that a major change in technology associated with the grinding of cereals may account for changes in asymmetry in the upper arms of women in the Neolithic through Iron Age across a large area of Europe. It has been observed that bilateral asymmetry in humeral strength (i.e., polar section modulus) decreased to near zero in early agricultural females, but increased again during the Iron Age. These changes in asymmetry in females have been interpreted as the direct consequence of the adoption of the saddle quern at the start of the Neolithic and its subsequent replacement by the rotary quern in the Iron Age. To test the impact of these alternative cereal grinding methods, we tested the efficiency of saddle and rotary quern grinding with 16 female volunteers and the effect of grinding on muscle activity of the upper limb with 20 female volunteers. We used electromyography to measure muscle activity in the pectoralis, deltoideus, infraspinatus and triceps muscles and adjusted muscle activity for efficiency and muscle size. Saddle quern grinding was 4.3 times less efficient than rotary quern grinding and produced a significantly higher amount of coarse- and middle-grained flour but a significantly lower amount of very fine grained flour than rotary quern grinding. Saddle quern grinding showed symmetrical muscle activity in all four studied muscles, whereas rotary quern grinding yielded consistent directional asymmetry in a majority of muscles even during bimanual rotation. Saddle quern grinding required about twice as much muscle activity per kg of grain when adjusted for muscle size than rotary quern grinding. Our results support the view that saddle quern grinding may have played a major role in the decrease in directional asymmetry in humeral strength in early agricultural females and that the adoption of the rotary quern during the Iron Age may have increased humeral directional asymmetry mainly because of increased asymmetrical loading and the reduced time needed for grinding in favor of other manipulative tasks.

Publication date: June 2016Source:Journal of Archaeological Science, Volume 70 Author(s): Monica MărgăritRaw materials deriving from the aquatic environment were systematically used for personal ornamentation by modern humans throughout their entire history. In this study we analyse three types of raw materials: Lithoglyphus sp. shells, Unio sp. valves and Cyprinus carpio opercular bones. The central purpose of this paper is to initiate a database of the way in which wear develops according to the system of attachment and the longevity of use. In order to identify the costs invested in the manufacturing of these types of items, both from the point of view of time and effort, an experimental programme has been developed, which permits the recording of all the variables (means of gathering the raw material, technological stages, time recorded for each operation, and tools used). Furthermore, it was set the task of wearing the beads experimentally processed, as adornments, for two years, and of periodically evaluating the perforation and the surface of the pieces under a microscope. Moreover, observations made on archaeological specimens were compared to experimental replicas. The archaeological assemblages from the Romanian Neolithic were used as a case study to illustrate the relevance of the results.

Publication date: August 2016Source:Journal of Archaeological Science, Volume 72 Author(s): Michael Holton PriceI extend Metcalfe and Barlow’s field processing model to account for the opportunity cost of home labor and test the model using ethnographic observations of clove harvesting, cacao harvesting, and sago processing on the island of Seram in eastern Indonesia. The ethnographic observations are consistent with the opportunity cost of home labor time being between 0.58 and 0.96 that of field labor time. Since the Metcalfe-Barlow model assumes that the opportunity cost of home labor is zero, this refinement of the Metcalfe-Barlow model is warranted in the social and ecological context in which the data was collected and in archaeological contexts where the opportunity cost of home labor cannot clearly be ignored. The extended model predicts a lower threshold than the Metcalfe-Barlow model for the critical transport time beyond which field processing should occur, which has broad implications for recognizing and explaining archaeological and paleoecological signatures of subsistence transitions. I illustrate this by showing that for sago processing the extended model predicts a threshold that is less than half that predicted by the Metcalfe-Barlow model. This low threshold suggests that sago is unlikely to be processed at home. Given this and the perishable nature of both sago starch and traditional containers used to transport it, the limited evidence for sago in archaeological assemblages should not be taken as evidence that it was an unimportant resource in prehistory.

Publication date: June 2016Source:Journal of Archaeological Science, Volume 70 Author(s): Joan Negre, Facundo Muñoz, Carla LancelottiMaps representing the distribution of chemical residues over anthropogenic floors are the main diagnostic tools used by archaeologists for addressing the identification of geochemical signatures of past actions. Geostatistics allows producing these maps from a sample of locations by modelling the spatial autocorrelation structure of these kind of phenomena. However, the homogeneity of the prediction regions is a strong assumption in the model. The presence of barriers, such as the inner walls of domestic units, introduces discontinuities in prediction areas. In this paper, we investigate how to incorporate information of a geographical nature into the process of geostatistical prediction. We propose the use of cost-based distances to quantify the correlation between locations, a solution which has proved to be a practical alternative approach for archaeological intrasite analysis. The cost-based approach produces more reliable results avoiding the unrealistic assumption of the homogeneity of the study area. As a working example, a case study of the distribution of two specific chemical signatures in domestic floors is presented within a controlled ethnographical context in Northern Gujarat (India). On a broad disciplinary scale, the benefits of using our approach include improved estimates in regions with complex geometry and lower uncertainty in the kriging predictions.

Publication date: Available online 26 July 2016Source:Journal of Archaeological Science Author(s): Ximena S. Villagran, André Strauss, Christopher Miller, Bertrand Ligouis, Rodrigo OliveiraFew archaeological sites in the Americas contain high concentrations of human burials dating back to the early Holocene. The tropical karstic region of Lagoa Santa, in central Brazil (state of Minas Gerais) is one of the richest bioanthropological records available to study the behaviors and funerary practices of early Holocene South Americans, with more than 200 skeletons found so far. One of the key locations to examine the history of human settlement in Lagoa Santa is the site of Lapa do Santo, a rockshelter known to contain the oldest rock art and the earliest evidence of funerary complexity in the continent. In this geoarchaeological investigation we focus on the early Holocene settlement at Lapa do Santo (7.9–12.7 cal kyBP) applying high-resolution geoarchaeological techniques, such as micromorphology, organic petrology and μFTIR, on both archaeological, modern reference and experimental samples. This is the first time that a micro-contextual approach integrated with experimental geoarchaeology has been applied to study the formation of rockshelter deposits in a tropical setting. Our results show that the stratigraphic sequence formed under the dual influence of anthropogenic sedimentation—through continuous combustion activities—and geogenic sedimentation in the form of oxisol aggregates which fell from above the limestone cliff into the rockshelter. Intact hearths and remobilized combustion debris, possibly hearth rake-out, are close to the graves suggesting repeated burning activities as part of the ritual behavior of early Holocene South Americans. Large amounts of ash are intermixed with heated and unheated oxisol aggregates. Heated termite mound fragments were also found mixed within the sediments. Post-depositional alteration of the site includes limited bioturbation and localized, low energy surface water and sub-surface concentrations of moisture, leading to precipitation of dense, secondary carbonates. The age inversions can be attributed to the human action of reworking the ashy sediments and not to post-abandonment processes. Despite this, the overall preservation of the sediments is good and most human burials can be considered to be in primary context.

Publication date: June 2016Source:Journal of Archaeological Science, Volume 70 Author(s): Gwenaëlle Goude, Michel FontugneStudies on Holocene periods in France and Liguria over the past 15 years provide an important isotopic database (δ13C and δ15N) on human and animal bone collagen during the Neolithic period (ca. 5500–3100 BC cal.; n = 573). The distribution of archaeological sites (n = 30) along a latitudinal transect from the Mediterranean to the Channel offers a broad data base reflecting a variety of environments and potential cultural practices. We propose a new insight into δ13C and δ15N data to understand the variability in both environment and human diet at the onset of farming. Statistical comparisons highlight significant geographical variation in both δ13C and δ15N ratios in most of the examined species and particularly in wild herbivores (Δ13C = 3.8‰; Δ15N = 8.5‰). Higher δ15N and lower δ13C ratios are found in samples from northern France. Conversely, lower nitrogen and higher carbon isotopic ratios are present in samples from the Mediterranean area. Results indicate the probable strong influence of natural factors impacting soil and plant isotopic ratios and passing this variation further on into the whole food chain. Our data indicate that the isotopic baseline depends on the local environmental particularities which must be taken into account in reconstructing human palaeodiets.