Strontium isotope ratios in fossil teeth from South Africa: assessing laser ablation MC-ICP-MS analysis and the extent of diagenesis

This study tests the precision and accuracy of laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) for measuring strontium isotope ratios (⁸⁷Sr/⁸⁶Sr) in fossil teeth from Swartkrans and Sterkfontein in South Africa, and explores the extent of diagenesis in these specimens. Compared to solution MC-ICP-MS or thermal ionization mass spectrometry (TIMS) methods, LA-MC-ICP-MS can be faster and less expensive, but has lower precision and accuracy. We found that ⁸⁷Sr/⁸⁶Sr ratios in fossil rodent teeth measured by LA-MC-ICP-MS were offset from solution values by a mean of 0.0005 ± 0.0010 (2σ). Because of the very wide spread of biologically available ⁸⁷Sr/⁸⁶Sr ratios (∼0.710 to ∼0.790) in the region, LA-MC-ICP-MS is more than sufficient for assessing the geographic origins of the fossil rodents. The concentration of strontium in modern and fossil enamel from the area is statistically indistinguishable, as is the range of ⁸⁷Sr/⁸⁶Sr ratios in modern rodents and fossil rodents from Swartkrans. Thus, there is little evidence of diagenetic Sr in the fossil enamel. In contrast, the fossil dentine may contain up to ∼50% diagenetic strontium, although many dentine ⁸⁷Sr/⁸⁶Sr ratios are still far removed from the background cave value of 0.729. We propose that LA-MC-ICP-MS will also be of use for investigating the geographic origins of other, non-rodent fossil teeth from the Sterkfontein and Swartkrans collections, and may prove of similar utility at other suitable sites.     

Geographic Information Systems (GIS) hydrological modeling in archaeology: an example from the origins of irrigation in Southwest Arabia (Yemen)

From small bands of foragers, pastoralists, and village agriculturists, to states and civilizations water accessibility and management played a crucial role in sustenance and social life throughout the ancient world. Recent advances in Geographic Information Systems (GIS) and related remote sensing technologies offer powerful means of analyzing water flow that are well-suited to clarify design and operational requirements of different irrigation and water management systems. Ancient Southwest Arabian irrigation technologies developed over thousands of years culminating in some the ancient world's most advanced flashflood water systems. This paper describes satellite imagery Digital Elevation Model (DEM) extraction and GIS hydrological modeling procedures conducted for the Wadi Sana watershed of Hadramawt Governate, Yemen. Results help illustrate one of the local contexts in which small-scale irrigation originated in Southwest Arabia and additionally serve as an example for those interested in applying similar methods in other regions.     

Charcoal reflectance measurements: implications for structural characterization and assessment of diagenetic alteration

Charcoal is a valuable source of archaeological and palaeoenvironmental proxy data. However growing evidence suggests that production conditions can strongly influence post-depositional alteration of charcoal. Consequently, both reconstruction of production temperature and understanding of the potential for diagenetic alteration are of great interest. Here, we use mean random reflectance (Ro_mean) in conjunction with other chemical characterization methods to address these questions. Ro_mean was obtained for a suite of modern analogue charcoal, produced under controlled conditions, and for a series of natural charcoal samples, obtained from archaeological and palaeoenvironmental deposits. Ro_mean proves to be a robust measure to assess formation temperature for samples produced at 400 °C and above, even after exposure to highly oxidizing conditions. Ro_mean is also useful for samples formed between 300 °C and 400 °C. However, if an assemblage of charcoals has been exposed to oxidizing conditions, lower temperature charcoals may be preferentially lost. It is apparent that charcoal produced at lower temperatures is more highly susceptible to chemical oxidation, and that there is a continuum in charcoal degradation potential, dependant upon fuel material and production conditions.     

Moving sources: A preliminary study of volcanic glass artifact distributions in northeast China using PXRF

Recent studies have highlighted the long-distance transport of obsidian from the Paektusan (Tianchi or Baitoushan in Chinese) volcano on the border between China and North Korea to eastern Russia and Korea, but little is known about the role of the local population in the production and movement or exchange of this important raw material. This paper addresses this data lacuna by presenting sourcing results of 440 artifacts from 18 Late Paleolithic sites located in northeast China. A portable XRF enabled rapid non-destructive characterization of samples. The results show that although Paektusan obsidian was widely transported throughout northeast Asia, material from at least three other sources was also used. In particular, we highlight the significance of basaltic glass artifacts with the same geochemistry as sources found in the Primorye region of Far East Russia in sites from northeast China. This result indicates a two-way movement of volcanic glass artifacts between Primorye and the northeast of China rather than a unidirectional long-distance exchange system originating from Paektusan Volcano.     

Death has a touch of class: society and space in Brookwood Cemetery, 1853–1903

Changes in the cultures and spaces of death during the Victorian era reveal the shifting conceptualisations and mobilisations of class in this period. Using the example of Brookwood Necropolis, established 1852 in response to the contemporary burial reform debate, the paper explores tensions within the sanitary reform movement, 1853–1903. Whilst reformist ideology grounded the cemetery's practices in a discourse of inclusion, one of the consequences of reform was to reinforce class distinctions. Combined with commercial imperatives and the modern impulse towards separation of living and dead, this aspect of reform enacted a counter-discourse of alienation. The presence of these conflicting strands in the spaces and practices of the Necropolis and their changes during the time period reflect wider urban trends.     

Experimental examination of animal trampling effects on artifact movement in dry and water saturated substrates: a test case from South India

This paper presents the motivation, procedures, and results of an experiment that examines short episodes of animal trampling in dry and water saturated substrates in South India. While horizontal artifact displacement was similar to that modeled by other trampling experiments, vertical artifact displacement in water saturated substrates was greater than any reported experiment to date. The toolstone used in this experiment, a silicious limestone, exhibited minimal damage after trampling. Artifact inclination patterning appeared to be a potentially diagnostic middle-range marker of trampling in water saturated substrates. Given the abundant number of Paleolithic sites that are located on flat, open surfaces near water-bodies, or experience monsoonal climatic regimes, we propose that future excavations should measure artifact inclination on a regular basis.     

Balancing London? A Preliminary Investigation of the “Core Cities” and “Northern Way” Spatial Policy Initiatives Using Multi-City Corporate and Commercial Law Firms

This paper reports a preliminary investigation into the economic efficacy of two spatial frameworks—English Core Cities and the Northern Way—recently promoted by national policy makers. We ask whether they are consistent with contemporary economic process in the UK space economy through analyses of commercial multi-city law firms. The latter are treated as an “indicator sector” to define the contemporary UK space economy as practised by law firms. Within this new space of flows, the location strategies of the law firms do confirm the salience of the Northern Way (as trans-Pennine corridor) and Core Cities as part of a larger UK metropolitan space of flows. Conflating the two spatial frameworks leads us to identify hints of a rebalancing of London within a metropolitan UK space. A Manchester polycentric mega-city region is found to be the likely candidate for this role. This finding in no way impinges on London's dominant global role, and we conclude that perhaps mutuality between London and provincial cities is beginning to replace past negative dependency relations.     

Between anatamo- and bio-politics: Geographies of sexual health in wartime Seattle

We offer an analysis of public health governmentality and its constitutive elements during a moral panic around venereal disease in World-War II Seattle, Washington. Tracing how norms of sexuality, gender, race, age and class were instilled through urban public health practices, we highlight the importance of the local state’s spatial ontologies and imaginations in connecting in particular the elements of anatamo-politics and bio-politics. By doing this, we extend current work on governmentality in geography by suggesting that geographical imaginations and ontological framings by the local state – particularly urban public health authorities – are themselves important elements in the control of populations and identity.