Twenty‐two objects of glass from the Decapolis city of Gerasa, N. Jordan, with characteristic vessel forms ranging from Hellenistic to Early Islamic (2nd century BCE to 8th century CE) were analyzed for major and trace elements, and 16 samples for Sr‐isotopes. The majority were produced in the vicinity of Apollonia on the Palestine coast in the 6th–7th centuries CE, and strong inter‐element correlations for Fe, Ti, Mn, Mg, Nb reflect local variations in the accessory minerals in the Apollonia glassmaking sand. The ubiquity of recycling is reflected in elevated concentrations and high coefficients of variation of colorant‐related elements as well as a strong positive correlation between K and P. The high level of K contamination is attributed to the use of pomace (olive processing residue) as fuel, and a negative correlation with Cl, due to volatilization as the glass was reheated. This points to an efficient system for the collection of glass for recycling in Jerash during the latter part of the first millennium CE. Differences in elemental behavior at different sites in the Levant may reflect the context of the recycling system, for example, glass from secular contexts may contain less colorants derived from mosaics than glass associated with churches.

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SignificanceUnderstanding how people in the past adapted to environmental and economic challenges can help us anticipate and meet these challenges in the present. However, these very processes threaten the physical remains embodying this information worldwide: Urban expansion and resource exploitation mean that the quantity and quality of archaeological information are diminishing daily. In this work, we demonstrate how multitemporal aerial photography and modern airborne laser scanning are invaluable tools for mapping the remaining archaeological features extant in the present and for adding context to them from what has been lost. This knowledge enables cultural heritage administrators and archaeologists to actively monitor, understand, and manage the existing remains to make sure important information is not lost to posterity.

Archaeological glass contains information about the movement of goods and ancient economies, yet our understanding of critical aspects of the ancient glass industry is fragmentary. During Roman times, distinct glass types produced in coastal regions of Egypt and the Levant used evaporitic soda (natron) mixed with Nile-derived sands. In the Levant, furnaces for producing colourless Roman glass by addition of manganese have been uncovered, whereas the source of the desirable antimonydecolourised Roman glass remains an enigma. In the Edict of Diocletian, this colourless glass is listed as "Alexandrian" referring to Egypt, but its origin has been ambiguous. Previous studies have found overlapping strontium and neodymium isotope ratios for Levantine and Egyptian glass. Here, we confirm these findings and show for the first time, based on glasses from the ancient city of Gerasa, that hafnium (Hf) isotopes are different in Egyptian and Levantine natron glasses, and that Sb Roman glass is Egyptian. Our work illustrates the value of Hf isotopes in provenancing archaeological glass. We attribute the striking difference in Hf isotopes of Egyptian versus Levantine glasses to sorting of zircons in Nile sediments during longshore drift and aeolian transport along the southeastern Mediterranean coast leaving behind a less juvenile fraction. The Roman glass industry underwent a massive expansion over the first century CE. At its peak it supplied not only tablewares for households across the Empire but also furnished major public buildings with many tonnes of glass for windows and mosaics 1,2. The raw glass was made by fusing Egyptian evaporitic soda (natron) and sand to produce large glass slabs in tank furnaces with capacities of 8-20 tonnes 3,4. These were broken up and distributed to glass workshops where the glass was remelted and shaped into objects for use 5,6. This division of production continued until at least the ninth century, when a change from a mineral soda flux over to plant ash occurred bringing about the end of the Roman glassmaking tradition 7,8. The technological achievements of the Roman glass industry were precocious and not surpassed until the rise of the European industries in the eighteenth century. In particular, the Romans produced large quantities of an expensive and highly valued glass, described by Pliny 9 as "colourless or transparent, as closely as possible resembling rock crystal" (Fig. 1), where the iron from the sand was oxidised from blue Fe 2+ to very pale Fe 3+ by the addition of antimony oxide, Sb 2 O 3 10,11. In the Price Edict of Diocletian, this colourless glass is listed as "Alexandrian" thereby referring to Egypt 12. Despite this, the production site for this so-called Sb Roman glass is unknown but several authors have suggested, on the basis of circumstantial evidence, that it was in Egypt 13,14 (see Supplementary Information for details). Strong evidence that the primary glassmaking factories melting sand and natron to glass were predominantly located along the coast of the eastern Me...

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.

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La récente fouille d'un habitat privé à Jerash : nouvelles considérations sur les permanences et les changements de la culture matérielle de l'Antiquité tardive au début de la période islamiqueDepuis 2011, le Projet germano-danois du quartier nord-ouest de Gerasa mène des recherches archéologiques sur la zone la plus élevée de l'ancienne ville enceinte. En 2014, les fouilles ont débuté sur la « terrasse orientale » , qui s'étend sur environ 3 000 m² et surplombe l'Artémision d'époque romaine. Cette zone était recouverte par d'importants déblais qui enfermaient les vestiges d'un habitat domestique du début de l'époque islamique, détruit par le tremblement de terre de 749 et jamais réoccupé depuis. Une maison privée a été en partie fouillée (secteur K). Elle ne recouvre aucune phase ni romaine ni byzantine et a été abandonnée à la suite du tremblement de terre avec l'ensemble de son mobilier. L'absence de phases chronologiques antérieures, le mobilier ainsi que la destruction soudaine de cette habitation en font un exemple important qui permet d'entreprendre une étude des permanences et des changements de la culture matérielle de l'Antiquité tardive au début de l'époque islamique. L'habitat et les découvertes de ce secteur sont présentés ici pour la première fois et contextualisés dans l'arc chronologique des VII e -VIII e siècles. [Trad. de la Rédaction] 2000, as well as Walmsley 2005. major sanctuaries on the development of the urban center, see ACHIM LICHTENBERGER, RUBINA RAJA