Strontium Isotopes in the Investigation of Early Glass Production: Byzantine and Early Islamic Glass from the Near East*

⁸⁷Sr/⁸⁶Sr ratios have been determined for glasses from four production sites, dated to between the sixth and the 11th centuries, in the Eastern Mediterranean region. On the basis of elemental analyses, the glasses at each location are believed to have been melted from different raw materials. Two glass groups, from Bet Eli‘ezer and Bet She‘an, in Israel, are believed to have been based upon mixtures of Levantine coastal sands and natron, and have ⁸⁷Sr/⁸⁶Sr ratios close to 0.7090, plus high elemental strontium, confirming a high concentration of modern marine shell (⁸⁷Sr/⁸⁶Sr ~ 0.7092) in the raw materials. The isotopic compositions of these two groups of glasses differ slightly, however, probably reflecting a varying ratio of limestone to shell because the sands that were utilized were from different coastal locations. Natron‐based glasses from a workshop at Tel el Ashmunein, Middle Egypt, have ⁸⁷Sr/⁸⁶Sr values of 0.70794–0.70798, and low elemental strontium, consistent with the use of limestone or limestone‐rich sand in the batch. High‐magnesia glasses based on plant ash, from Banias, Israel, have ⁸⁷Sr/⁸⁶Sr values of 0.70772–0.70780, probably reflecting the isotopic composition of the soils that were parental to the plants that were ashed to make the glass. Strontium and its isotopes offer an approach to identifying both the raw materials and the origins of ancient glasses, and are a potentially powerful tool in their interpretation.     

Gender,precarity and hybrid forms of work identity in the virtual domestic arts and crafts industry in Canada and the US

Over the last several decades, there has been a growing recognition of the precarious nature of employment in creative economies, including craft industries. Despite this work, little research has explored how the rise of the platform economy is affecting labour market precarity. Our article explores the nature of precarity in craft blogging, looking in particular at the domestic arts and crafts. We examine how a growing number of women have left other forms of employment to engage in sewing, knitting, quilting, cooking and baking. Many women have also taken to blogging about their endeavors. However, there is a paucity of research on the variety of types of work that craft bloggers engage in and the challenges they face. Drawing upon interviews with female domestic arts bloggers in Canada and the United States, the article explores the work that craft bloggers engage in, the space and time of labour, and the variable sources of income that they access through their work. The article analyzes the experiences of precarious labour that arise at the interface of craft and the internet, and the multiple identities that stem from hybrid forms of creative work.     

Discriminant function analyses in archaeology: are classification rates too good to be true?

The use of discriminant function analyses (DFA) in archaeological and related research is on the increase, however many of the assumptions of this method receive a mixed treatment in the literature. Statisticians frequently use complex statistical models to investigate analytical parameters, but such idealised datasets may be hard to relate to “real-life” examples and the literature difficult to assess. Using two faunal datasets that are more typical of archaeological and related research, one comprised of size-corrected linear measurements of bovid humeri and another of 3D geometric morphometric (GMM) shape data of African monkey skulls, and two simulated datasets, we illustrate some of the most important but often ignored issues of DFA. We specifically show why it is paramount to address “over-fitting” by cross-validation when applying this method and how the probability of correctly classifying cases by chance can be properly and explicitly taken into account.     

The Colocation Quotient: A New Measure of Spatial Association Between Categorical Subsets of Points. 协同区位商：点集分类子集间空间关联性的新度量标准

This article presents a new metric we label the colocation quotient (CLQ), a measurement designed to quantify (potentially asymmetrical) spatial association between categories of a population that may itself exhibit spatial autocorrelation. We begin by explaining why most metrics of categorical spatial association are inadequate for many common situations. Our focus is on where a single categorical data variable is measured at point locations that constitute a population of interest. We then develop our new metric, the CLQ, as a point‐based association metric most similar to the cross‐k‐function and join count statistic. However, it differs from the former in that it is based on distance ranks rather than on raw distances and differs from the latter in that it is asymmetric. After introducing the statistical calculation and underlying rationale, a random labeling technique is described to test for significance. The new metric is applied to economic and ecological point data to demonstrate its broad utility. The method expands upon explanatory powers present in current point‐based colocation statistics.     

Applying GIS tools to define prehistoric megalith transport route corridors: Olmec megalith transport routes: a case study

Applying spatial data management and analytical tools is an accepted method for investigating potential settlement patterns. This study applied Geographic Information System (GIS) technology to the study of Preclassic Olmec megalith transport in Mesoamerica. The GIS slope gradient tool was used to identify potential transport corridors with gradients of less that 1:10, which defines the limit of human effort needed to control these stones as demonstrated in ethnographic and replication experiments by various researchers. These outcomes were also used to refine transportation methods and likely start points that would be used to cross lowlands near to the San Lorenzo centre of Olmec society.     

The Elusive Maya Marketplace: An Archaeological Consideration of the Evidence

The modeling of ancient Maya economies has been a dynamic area of archaeological research in the past few decades, but in most cases there has been little attention on how goods actually changed hands. Through an overview of the literature, this paper considers marketplace exchange as one mechanism of distribution. Researchers have proposed a number of physical features and artifact characteristics that may be expected in association with marketplace activity, and new methods of data collection have been offered that can be used to build a case for marketplace exchange. What remains is the challenge of developing strategies to identify ancient Maya marketplaces convincingly through archaeological excavation.