Urban-Riverine Hinterland Synergies in Semi-Arid Environments: Millennial-Scale Change,Adaptations, and Environmental Responses at Gerasa/Jerash

This interdisciplinary study addresses issues of urban-riverine hinterland relationships in semi-arid environments over millennia at Gerasa/Jerash in Jordan, presenting research that stimulates new lines of enquiry with much broader implications than those relating to this single site. Through the presentation of new data on wadi-sediment responses to social and environmental change, we assess ways in which urban settlements, their hinterlands, and rivers interact over long time periods and how such changes may be read together with historical sources and shed new light on urban-hinterland dynamics. We explore the hypothesis that synergistic relationships between an urban core and its hinterland are essential to the long-term sustainability of both. Our integrated approach gives new insight into settlement dynamics and resource use and carries implications for our understanding of the present through the past.     

Dropping Out or Signing Up? The Professionalisation of Youth Travel

Leaving school and dropping out of employment or further education was once an act of rebellion by cohorts of young people expressing anti‐establishment sentiments. Now it has become a neoliberal market place in the UK. Over the last five years the "gap year" has changed from a radical activity, dominated by charities and inspired by the travel of the hippie generation, to an institutionally accepted commercial gap year industry which helps form new citizens for a global age. This transformation has seen the dramatic growth in commercial gap year companies and in the numbers of young people in the UK taking gap years. Such growth, taking place under an increasingly engaged public gaze, has led to the professionalisation of the sector and to profound changes in its underlying values. Drawing on a range of empirical sources, I examine how the transformation of the gap year through the neoliberal market place has involved the application of corporate values and rhetoric to youth travel. Becoming "professional" has entailed a shift from collective idealism to the infinitely more saleable values of individual career development. While professional values give legitimacy to the gap year industry, its professional gaze is also proving to be relatively myopic—it has yet to be turned on the volunteer development projects through which many companies in the industry make their names, and money.     

Soils and palaeo-climate based evidence for irrigation requirements in Norse Greenland

Establishing and sustaining agricultural production was a key factor in the success of Norse settlements during the landnám colonisation across the North Atlantic. In light of the occurrence of channel features in several abandoned home-field areas of the Norse Eastern Settlement of Greenland, and the irrigation requirements of present-day Greenlandic sheep-farmers questions are raised: was irrigation used by the Norse settlers of Greenland on their home-field areas? and, if so, how frequently? Modelling of soil chemical, physical and soil-water hydraulic properties integrated with contemporary high-resolution climatic data demonstrate a frequent requirement for irrigation. Soil moisture deficits are related to the duration and intensity of winter temperature. Using the winter Dye 3 ice core δ¹⁸O record as a climatic proxy, the frequency of moisture deficits, based on comparing mean winter temperatures, indicates that there was a frequent irrigation requirement to maintain home-field productivity, increasing throughout the period of settlement until the 14th Century.     

First results on thermally induced porosity in chlorite cooking vessels from Merv (Turkmenistan) and implications for the formation and preservation of archaeological lipid residues

Excavations at the ancient city of Merv in Turkmenistan have yielded a significant assemblage of ceramic and stone vessel fragments from contexts dating to the Sasanian and medieval periods (5th–13th centuries AD). Many of the vessel fragments are encrusted with apparent food residue deposits offering scope for organic residue analysis and the potential to compare the use of these two very different vessel types. To enable meaningful comparison we sought to establish whether the vessel stone (a talc-chlorite schist) can absorb and preserve organic residues indicative of past use. This paper reports the first investigation to address this question using standard methods for archaeological residue analysis coupled with study of the properties of the schist fabric and basic absorption experiments. The results demonstrate that heating during cooking, even at relatively low temperatures, modifies the stone microstructure by increasing its porosity. These pores enhance the absorption capacity of the schist fabric such that chlorite cooking pots can absorb and preserve sufficient organic residue to reflect the original processing of foodstuffs, as has been previously demonstrated for ceramic fabrics. Comparison of pore capacity, archaeological residue yield and experimental absorption indicates the significance of pore-size distribution for the relative retention and preservation of organic residues in these fabrics. The results of this study indicate that a wider range of archaeological material may be suitable for absorbed residue analysis than has previously been recognised. The findings also challenge previous assumptions concerning the relationship between the properties of chlorite vessels and their mode of use in Central Asia and Near East in antiquity.     

Prospection of two circular Bronze Age ditches with multi-receiver electrical conductivity sensors (North Belgium)

Two types of electrical conductivity sensors were evaluated to prospect circular ditches surrounding former Bronze Age burial mounds, complementing aerial photography. The first sensor was based on the electrical resistivity (ER) method, while the second sensor was based on frequency-domain electromagnetic induction (FDEM). Both sensors were designed with multiple receivers, which measure several depth sensitivities simultaneously. First, the sensors were tested on an experimental site where a rectangular structure with limited dimensions was dug in a sandy soil. The structure appeared as a higher conductivity anomaly in the low-conductivity sand. Then, both methods were applied on two Bronze Age sites with different soil properties, which were discovered by aerial photography. The first site, in a sandy soil, gave only very weak anomalies. Soil augering revealed that the ditch filling consisted of the same sandy material as the surrounding, therefore this filling was not able to cause a high-conductivity contrast. Due to its lower sensitivity to noise in the low-conductive range, the ER-sensor produced a more pronounced anomaly than the FDEM-sensor. The second site was located on top of a ridge with a shallow substrate of Tertiary, coastal sediments. The ditch was very clearly visible on the sensor maps as a conductive low. At this location, the soil augering revealed that the ditch was dug through an alternating clay-sand layer and subsequently filled up with silty material from the topsoil. Overall, the shallow receiver separation produced anomalies that were both stronger and that corresponded better to the geometry of the ditches. The other receiver separations provided more information on the natural soil layering, and in the case of the ER-array they could be used to obtain a cross-section of the actual electrical conductivity with 2-D inversion modelling. The results of this study proofed that conductivity sensors can detect Bronze Age ditches, with varying contrast depending on the soil geomorphology. Moreover, the sensor maps combined with soil observations by coring provided insight in the environmental conditions that influence the contrast of the anomalies seen on the aerial photographs and the sensor maps.