Improving the interpretability of 3D GPR data using target–specific attributes: application to tomb detection

Three–dimensional (3D) ground–penetrating radar (GPR) represents an efficient high–resolution geophysical surveying method allowing to explore archaeological sites in a non–destructive manner. To effectively analyze large 3D GPR data sets, their combination with modern visualization techniques (e.g., 3D isoamplitude displays) has been acknowledged to facilitate interpretation beyond classical time–slice analysis. In this study, we focus on the application of data attributes (namely energy, coherency, and similarity), originally developed for petroleum reservoir related problems addressed by reflection seismology, to emphasize temporal and spatial variations within GPR data cubes. Based on two case studies, we illustrate the potential of such attribute based analyses towards a more comprehensive 3D GPR data interpretation.     

A SIMPLIFICATION AND GENERALIZATION OF THE EXCLUSION THEOREM: A TECHNICAL NOTE

Several researchers have proven that for the integrated production-location problem on the Weberian triangle, intermediate points on the edge of the triangle can never be optimal locations. Authors of previous proofs of this result have used cumbersome trigonometric arguments. We present a much simpler algebraic proof of the result, and present it in terms of the more general n -input model, where the feasible location space is a convex polygon rather than a triangle. In addition, the result generalizes immediately to other cases, such as (1) multifacility production-location problems, (2) stochastic versions of one-facility and multifacility production-location problems, and (3) comparable pure location problems (e.g., the Weber problem).     

Habitat preference of extant African bovids based on astragalus morphology: operationalizing ecomorphology for palaeoenvironmental reconstruction

The habitat preferences of fauna found at palaeontological and archaeological sites can be used to investigate ancient environments and hominin habitat preferences. Here we present a discriminant function model linking astragalus morphology to four broadly defined habitat categories (open, light cover, heavy cover, and closed) using modern bovids of known ecology. Twenty-four measurements were taken on a sample of 286 astragali from 36 extant African antelope species. These measurements were used to generate ratios reflecting shape. An 11 variable discriminant function model was developed that had high classification success rates for complete astragali. Resubstitution analysis, jackknife analysis, and the classification of several “test samples” of specimens suggest that the predictive accuracy of this model is around 87%. The total classification success rates of 87% (jackknifed) or 93% (resubstitution) are considerably higher than those derived in another study of bovid astragalus ecomorphology (67%; [DeGusta, D., Vrba, E.S., 2003. A method for inferring palaeohabitats from the functional morphology of bovid astragali. J. Archaeol. Sci. 30, 1009–1022]) that used a more limited measurement scheme and a smaller sample of bovids than the present study. Different approaches to operationalizing ecomorphic analyses are considered in order to best extract accurate palaeoenvironmental information from palaeontological and archaeological datasets.     

The Importance of Attention Diversity and How to Measure It

Studies of political attention often focus on attention to a single issue, such as front‐page coverage of the economy. However, examining attention to a single issue without accounting for the agenda as a whole can lead to faulty assumptions. One solution is to consider the diversity of attention; that is, how narrowly or widely attention is distributed across items (e.g., issues on an agenda or, at a lower level, frames in an issue debate). Attention diversity is an important variable in its own right, offering insight into how agendas vary in their accessibility to policy problems and perspectives. Yet despite the importance of attention diversity, we lack a standard for how best to measure it. This paper focuses on the four most commonly used measures: the inverse Herfindahl Index, Shannon's H, and their normalized versions. We discuss the purposes of these measures and compare them through simulations and using three real‐world datasets. We conclude that both Shannon's H and its normalized form are better measures, minimizing the danger of spurious findings that could result from the less sensitive Herfindahl measures. The choice between the Shannon's H measures should be made based on whether variance in the total number of possible items (e.g., issues) is meaningful.     

SANET: A Toolbox for Spatial Analysis on a Network

This article shows a geographical information systems (GIS)-based toolbox for analyzing spatial phenomena that occur on a network (e.g., traffic accidents) or almost along a network (e.g., fast-food stores in a downtown). The toolbox contains 13 tools: random point generation on a network, the Voronoi diagram, the K -function and cross K -function methods, the unconditional and conditional nearest-neighbor distance methods, the Hull model, and preprocessing tools. The article also shows a few actual analyses carried out with these tools.     

Determining Olmec maize use through bulk stable carbon isotope analysis

Bulk stable carbon isotope analysis on absorbed organic residues in ceramics can be an effective method for discerning patterns of maize use when the ceramics come from relatively uniform archaeological contexts. The bulk stable carbon isotope method is faster and less costly than the more commonly used compound-specific stable carbon isotope analysis. Moreover, the bulk stable carbon isotope method can determine the presence of C4 plant carbon in samples in which organic compounds have degraded. Bulk stable carbon isotope analysis was used to discern patterns of maize (Zea mays mays) use among a sample of 24 ceramic sherds from an Early Franco Period feasting deposit (ca. cal 650 B.C.) at the Olmec site of San Andrés, La Venta, Tabasco, Mexico. A comparison of the δ 13C results of different categories of ceramics showed that proportionally more maize was used in luxury beverage service wares than in utilitarian vessels, suggesting that maize-based beverages were prominent in this probable elite feasting episode.     

Using Technology Absorption as an Evaluation Criterion: Case Studies from a State Research and Development Program

State agencies sponsoring local research and development projects often finance the development of technologies in partnership with other organizations. These contracting partners develop and demonstrate the new technology. This study distinguishes between two types of outcomes from such projects. Technology absorption is the adoption of a technology by an organization participating in the project. Technology transfer is the process by which outcomes are adopted by organizations outside the project (i.e., nonparticipants). From an evaluation perspective, research and development projects that result in the absorption of technology, without any subsequent transfer, are difficult to assess. Often these outcomes are counted the same as a transfer even though the process is subsidized by the state.
Three case studies of absorption outcomes are presented. Absorption projects tend to be distinctive because: (a) they develop technologies that are very large in scale and very complex; (b) project leadership typically is provided by an end-user who attempts to employ the technology for commercial purposes; (c) success is measured through the technological accomplishment and ongoing commercial venture rather than by the number of adopting organizations; and (d) they produce spillover benefits in the cohesion of the social networks formed among project participants.     

Addressing sustainability challenges in micro-municipalities: Insights from the study of Quebec's smallest municipalities

Many empirical studies on large municipalities, ranging from thousands to millions of inhabitants, have helped shape the knowledge of sustainability management in developed countries. However, issues and approaches specific to micro-municipalities with fewer than 1,000 inhabitants have been relatively less covered. In this context, this study presents an empirical content analysis of sustainability-related instruments used in the 487 smallest municipalities of Quebec. A total of 1,962 instrumental documents were identified, and their characteristics (e.g., accountability-based vs. informative-based approach) and scope (e.g., land-use planning and pollution reduction) were assessed. The results are threefold. First, informative-based instruments (e.g., flyers and project presentations) are generally preferred to those with accountability mechanisms (e.g., policies and plans). Second, 90% of the municipalities address sustainability issues, but in pieces and parsimoniously rather than comprehensively; hence, initiatives vary significantly from one municipality to another. Third, because of their mandatory nature, initiatives such as sorted waste collection and pro-environmental zoning are common among municipalities. In contrast, non-mandatory services such as transportation planning have only a few adopters. These findings have policy implications for urban sustainability management in micro-municipal organizations.     

Geochemical composition of source obsidians from Kenya

Here we provide a reference resource to archaeologists interested in the sources of obsidian in Kenya, through electron microprobe analyses of 194 obsidian samples from 90 localities. Averaged analyses of each sample and eleven published analyses are categorized into 84 compositional groups of which only about 21 are known to have been used to produce artifacts, possibly because studies of artifactual material in the region are lacking. We also provide trace element analyses determined by XRF and LA-ICP-MS for these same obsidians. In northern Kenya 27 distinct compositions of obsidian have been found, including some of Miocene age, but the source of the most abundant obsidian found in archaeological sites in this part of Kenya remains obscure. The Baringo region contains at least 13 varieties of low-silica obsidian. The Naivasha–Nakuru region contains an abundance of obsidian with 38 compositional types recognized, and is the only region in Kenya apart from the Suregei (northern Kenya) that contains rhyolitic obsidian. Nine compositionally distinct types of obsidian are known from southern Kenya. Although Kenyan obsidians span the compositional range from phonolite to rhyolite, low-silica, nepheline-normative obsidians occur only south of 1°N latitude. One obsidian type, the Lukenya Hill Group, appears to have been derived from a regionally extensive ash flow tuff with a distribution of over 8000 km². From previous studies it is known that obsidians of lowest (Mundui) and highest iron content were used for tool manufacture, as were some obsidians (e.g., Kisanana) with the highest alkali content, and obsidians with both high (Njorowa) and low (Kisanana) silica content.     

Stone-boiling maize with limestone: experimental results and implications for nutrition among SE Utah preceramic groups

Groups living on Cedar Mesa, SE Utah in the late Basketmaker II period (Grand Gulch phase, AD 200–400) were heavily maize-dependent, but lacked beans as a supplemental plant protein, and pottery vessels for cooking. Common occurrence of limestone fragments in their household middens suggests 1) limestone may have been used as the heating element for stone-boiling maize and 2) this practice might have made some maize proteins more available for human nutrition. Experiments examined these possibilities; results indicate that stone-boiling with Cedar Mesa limestone creates an alkaline cooking environment suitable for nixtamalization of maize kernels, and that maize cooked in this fashion shows significant increases in availability of lysine, tryptophan, and methionine. Archaeological limestone fragments from a Grand Gulch phase site show amounts of fragmentation and changes in density consistent with repeated heating. While not conclusive, these data indicate that further research (e.g., examination of archaeological limestone fragments for maize starch grains or phytoliths) is warranted. It is suggested that greater attention be paid to archaeological indications of stone-boiling with limestone among maize-dependent but pre-pottery societies.     

Biomechanical insights into activity and long distance trade in the south-central Andes (AD 500–1450)

Long distance trade has been attributed important social and economic roles in the pre-colonial south-central Andes, but how these trade networks were operated and organised, and the roles played by different populations and social groups (e.g. elites), remain uncertain. This study aims to offer new perspective on these questions through biomechanical analyses of human skeletal remains from a probable key site in these networks, San Pedro de Atacama (SPdA). Groups that were more intensively involved in long distance trade are expected to have been more habitually mobile, and thus to show greater robusticity and less circular lower limb bone cross-sections. Lower limb biomechanical properties of elite and non-elite Middle Horizon groups (MH, AD 500–1000) were compared with subsequent transitional MH-Late Intermediate Period (LIP, AD 1000–1450) and LIP groups from SPdA, and with LIP groups from Pica-8 and the Azapa Valley. The results indicate that MH populations from SPdA had less robust lower limbs and were by inference less mobile than their successors, with no differences between elite and non-elite, while robusticity was elevated in the MH-LIP transition group. Alternative explanations for the results, such as changes in herding activities, cannot be entirely discounted based on current evidence, but the results are consistent with hypotheses that SPdA may have served as a hub on long distance trade networks during the MH, before residents became more actively involved in long distance trade following the collapse of key links with the Tiwanaku polity. The results also indicate similar levels of robusticity among LIP populations at SPdA, Pica-8 and in the Azapa Valley, implying they may have been involved in trading activities to a similar extent, and perhaps to a greater extent than SPdA MH groups, as regional intergroup relationships changed.     

WEST AFRICAN METALS AND THE ANCIENT MEDITERRANEAN

Summary. Contact between the Mediterranean in Roman or earlier times and the Sahara and lands beyond has commonly been examined from the northern angle with rather negative results (as for instance in Mortimer Wheeler's Rome Beyond the Imperial Frontiers, 1954). Although West African archaeology is still at an infant stage, it is now becoming possible to examine the issue from a southern, inner African, angle. (The multi-volume Cambridge History of Africa, 1975-, and the less consistent UNESCO General History of Africa, 1981-, document some of the progress made in reconstructing the African side of the story.) And, while substantial trans-Saharan communications did not develop till late in the first millennium A. D. with camel-caravans, stimulated especially by the gold of Far-West Africa, evidence is emerging of earlier exploitation of other metals, perhaps connected with horse (and cart?) transport. At two localities on the southern Saharan edge there was copper mining and smelting around the mid-first millennium B.C., with likely trade of the product to the Mediterranean. The case for Nigerian tin at the same period—raised by Taylor in the previous volume of this Journal (1, 317–24)—is less clear, but would make sense in this context. That the same period saw the spread of iron technology in these sub-Saharan regions is doubtless more than coincidence.     

Changing growing conditions for crops during the Near Eastern Bronze Age (3000–1200 BC): the stable carbon isotope evidence

The analysis of carbon isotope discrimination (Δ¹³C) in crop plant remains from seven Bronze Age sites in northern Mesopotamia and the Levant shows clear differences in water availability between the different geographic areas and throughout the different periods (3000–1200 BC). Amongst the different moisture variables modelled precipitation minus evaporation (P-E—using a macrophysical climate model (MCM)) results in very high correlation (0.74) with Δ¹³C values in barley, supporting the significance of climate parameters (effective moisture) in carbon fixation in this species. The comparison of Δ¹³C values of different crops in different periods confirms increased aridity during the Middle Bronze Age (2000–1600 BC), compared to the later Early Bronze Age (2700–2000 BC) particularly in the north-eastern Syrian territory with generally lower Δ¹³C values during the Middle Bronze Age, as has been documented in palaeoclimate proxies, and in agreement with the MCM. Standard deviation in Δ¹³C values from grains or seeds of one species originating from different samples of an individual site may be understood as variability in moisture conditions during the grain-filling period around the considered location. Large standard deviations occur preferably in sites with low mean annual precipitation (e.g. at Emar) and suggest that in these sites, at least some of the crops were irrigated.     

The adoption of culturally contentious innovations: The case of citizen oversight of police

Cultural contentiousness is defined as an attribute of innovation due to which it encounters resistance because of its incompatibility with hegemonic cultural assumptions. I argue that culturally contentious innovations are likely to be adopted when antecedents have productive symbolic force, i.e., they reveal contradictions between dominant cultural assumptions and the material outcomes of existing institutions or empower social actors to resolve such contradictions. However, antecedents with incapacitative symbolic force tend to obfuscate the above contradictions or decrease social actors’ capacity to resolve them, encouraging the adoption of less contentious innovation. Applying these arguments to citizen oversight agencies (COAs) for the police, I examine the antecedents of contentious (i.e., investigative) as opposed to less contentious (non-investigative) COAs. In support of the above argument, I find that productive antecedents (e.g., a consent decree, an increase in civil rights nonprofits) are associated with adopting investigative COAs. In contrast, incapacitative antecedents (e.g., a Law Enforcement Officer Bill of Rights, an increase in the violent crime rate) are associated with adopting non-investigative COAs. The findings broadly demonstrate that policy adoption scholars ought to distinguish policies in terms of cultural contentiousness and account for the symbolic force of antecedents. Further theoretical contributions are discussed.     

Geochemistry of sauceboats excavated from Independence National Historical Park (Philadelphia): evidence for a Bonnin and Morris (c. 1770–73) provenance and implications for the development of nascent American porcelain wares

Porcelain sauceboats excavated from a privy with a late 18th century (1786 or later) context at Independence National Historical Park (INHP) are anomalously Al-rich compared with previously analysed Anglo-American sulphurous phosphatic wares. Apart from their S content, they are most similar to phosphatic W^m Reid porcelain (Brownlow Hill, Liverpool, c. 1755–67, and its branch at Shelton, Staffordshire) in terms of their major element constituents, but they contain heavy minerals (e.g., TiO₂ polymorphs) and in this regard resemble a dated (1773) silicious-aluminous-calcic (S-A-C) Bonnin and Morris porcelain (Philadelphia) openwork porcelain basket. In terms of morphology and composition, some TiO₂ polymorphs in the 1773 basket match those from clay from White Clay Creek, Delaware, a resource reputedly exploited by Bonnin and Morris. Their high Nb/Cr ratios indicate derivation from a metapelitic (or granitic pegmatite) source. So too do some from the INHP sauceboats, although others are chrome-rich (∼1% Cr₂O₃), indicating a mafic source. The bedrock beneath White Clay Creek includes metasediments, granitic pegmatite, and metabasites (e.g., of the Wissahickon Formation), pointing to a local source for the TiO₂ polymorphs in the porcelains described here. Although the evidence for a Bonnin and Morris provenance for the INHP sauceboats is circumstantial, their enrichment in heavy minerals, unusual – perhaps experimental – compositions, and aesthetic characteristics nonetheless suggest a Philadelphia origin for these artifacts. The compositions of 18th century Philadelphia porcelain support the contention that knowledge of phosphatic and S-A-C pastes originating in London was transferred first to Staffordshire and Liverpool, and then to Philadelphia, perhaps via a potter by the name of W^m Ball.     

Debating Belarus: A Framing Comment

A British political scientist and eminent specialist on the politics of the post-Soviet states comments on the divergent perspectives offered in the two preceding papers in the symposium on Belarus in the same issue of Eurasian Geography and Economics. He first briefly reviews the diverse approaches to the study of Belarus evident in the academic literature, and the reasons scholars might be led to the country as a topic of study, especially its suitability as a test bed for several issues of importance in comparative studies (e.g., the nature of presidential power and of political "charisma," of governance without political parties, and an economic model that has appeared until now to have resisted the path of accelerated market reform). Probing more deeply, the author identifies issues of the comparative method of particular relevance to the exchange that warrant further investigation, and goes on to present his own survey data (from early 2011 for Belarus and from 2010 in Ukraine and Russia) in an effort to advance the debate on these issues. In concluding, he suggests a line of further enquiry for understanding better the seeming paradox that is Belarus—the role played by retention of "Soviet" institutions (e.g., trade unions, local councils) that offer a means of communication between ordinary citizens and the authorities.     

Assessing the macrofracture method for identifying Stone Age hunting weaponry

Macrofracture analysis is an experimentally derived method used as an initial step in investigating the hunting function of stone artefacts. Diagnostic impact fractures, which can only develop as a result of longitudinal impact, underpin this method. Macrofracture analysis recently gained favour in Middle Stone Age studies, supporting hypotheses for effective hunting during the late Pleistocene in southern Africa. However, the factors affecting diagnostic impact fracture formation and the interpretation of these fracture frequencies are not yet fully understood. This paper outlines a set of experiments designed to test macrofracture formation under human and cattle trampling and knapping conditions. The results show that: (a) macrofractures occur frequently when stone artefacts are trampled by cattle and humans and in knapping debris; (b) diagnostic impact fractures occur on some of the trampled flakes and knapping debris (≤3%), but significantly less often than in previous hunting experiments; (c) when they do occur, they are likely produced by longitudinal forces similar to those experienced during hunting; (d) considering artefact morphology is important during macrofracture analysis; and (e) macrofracture analysis is not a standalone method, but is most useful as part of a multi-analytical approach to functional analysis. These experiments help to establish a significant baseline diagnostic impact fracture frequency for the interpretation of archaeological macrofracture frequencies.     

Cutmarks and hominid handedness

Handedness in humans has been linked to brain lateralization and the evolution of language, but recent data on chimpanzee tool use suggest that the lateralization of hand and brain function may have instead preceded the time when the hominid and panid lineages split. The hominid paleontological and archaeological records are two sources for testing this hypothesis by helping to establish the antiquity of hominid handedness. As such, several methods have been proposed for identifying traces of hominid handedness in those records. Included among those methods is using the orientation of stone tool cutmarks on ungulate limb bone fragments. Here we report on an experiment created to test the accuracy and efficacy of one such method proposed by Bromage and his colleagues [Bromage, T.G., Boyde, A., 1984. Microscopic criteria for the determination of directionality of cutmarks on bone. American Journal of Physical Anthropology 65, 359–366; Bromage, T.G., Bermudez de Castro, J.M., Jalvo, Y.F., 1991. The SEM in taphonomic research and its application to studies of cutmarks generally and the determination of handedness specifically. Anthropologie 29, 163–169]. Our data indicate that the methodology proposed by Bromage and colleagues can yield accurate results in an experimental setting. However, considering the complexity of uncontrolled (i.e., non-experimental) human butchery, we question the method's efficacy for investigating the antiquity of human handedness as potentially recorded in the zooarchaeological record. Our results highlight the limitations of current approaches, but it is hoped that they will also stimulate new, more productive techniques that use the archaeological record to discern the development of human handedness and its evolutionary significance.     

Correcting temporal frequency distributions for taphonomic bias

In this paper, we expand upon a prior study [Surovell, T.A., Brantingham, P.J., 2007. A note on the use of temporal frequency distributions in studies of prehistoric demography. Journal of Archaeological Science 34, 1868–1877.] that explored the problem of taphonomic bias. Taphonomic bias refers to the tendency for younger things to be over-represented relative to older things in the archaeological record due to the operation of destructive processes like erosion and weathering. Using a database of radiocarbon dated volcanic deposits from Bryson, R.U., Bryson, R.A., Ruter, A. [2006. A calibrated radiocarbon database of late Quaternary volcanic eruptions. Earth Discussions 1, 123–124.], we develop an empirical model of taphonomic bias. In contrast to our prior study in which we modeled taphonomic bias as an exponential function wherein the likelihood of site loss remains constant through time, we argue that the probability of site destruction actually decreases with site age. We further demonstrate how this model can be used to correct temporal frequency distributions and extract demographic histories. We illustrate this approach using databases of radiocarbon dates from rockshelter and open-air sites in the Bighorn Basin, Wyoming, USA, and mammoths and humans in Siberia, Russia.     

Subsistence economics,family size,and the emergence of social complexity in hunter–gatherer systems in eastern North America

A consideration of ethnographic data, computational model results, and archaeological data suggest that changes in family-level economics coincident with subsistence intensification contributed to the emergence of social complexity among prehistoric hunter–gatherers in eastern North America by creating the conditions for a “rich get richer” scenario. Ethnographic data are used to construct a general computational model representing key person- and family-level behaviors, constraints, and decisions affecting the size and composition of hunter–gatherer families. Results from model experiments suggest that lowering the age at which children make a significant contribution to subsistence (e.g., through the broadening of the diet to include the kinds of mass-harvested, “low quality” foods that were increasingly exploited during the Archaic and Woodland periods) relaxes constraints on family size and makes large, polygynous families economically viable. Positive feedbacks between the productive and reproductive potentials of larger families produce right-tailed distributions of family size and “wealth” when the productive age of children is low and polygyny is incentivized. Size data from over 800 prehistoric residential structures suggest right-tailed distributions of family size were present during the Late Archaic through Middle Woodland periods. These distributions would have provided variability in family-based status that permitted the emergence of hereditary social distinctions.