Saruq al-Hadid Research Articles

Detecting and Predicting Archaeological Sites Using Remote Sensing and Machine Learning—Application to the Saruq Al-Hadid Site, Dubai, UAE

In this paper, the feasibility of satellite remote sensing in detecting and predicting locations of buried objects in the archaeological site of Saruq Al-Hadid, United Arab Emirates (UAE) was investigated. Satellite-borne synthetic aperture radar (SAR) is proposed as the main technology for this initial investigation. In fact, SAR is the only satellite-based technology able to detect buried artefacts from space, and it is expected that fine-resolution images of ALOS/PALSAR-2 (L-band SAR) would be able to detect large features (>1 m) that might be buried in the subsurface (<2 m) under optimum conditions, i.e., dry and bare soil. SAR data were complemented with very high-resolution Worldview-3 multispectral images (0.31 m panchromatic, 1.24 m VNIR) to obtain a visual assessment of the study area and its land cover features. An integrated approach, featuring the application of advanced image processing techniques and geospatial analysis using machine learning, was adopted to characterise the site while automating the process and investigating its applicability. Results from SAR feature extraction and geospatial analyses showed detection of the areas on the site that were already under excavation and predicted new, hitherto unexplored archaeological areas. The validation of these results was performed using previous archaeological works as well as geological and geomorphological field surveys. The modelling and prediction accuracies are expected to improve with the insertion of a neural network and backpropagation algorithms based on the performed cluster groups following more recent field surveys. The validated results can provide guidance for future on-site archaeological work. The pilot process developed in this work can therefore be applied to similar arid environments for the detection of archaeological features and guidance of on-site investigations.

Bronze age stone flaking at Saruq al-Hadid, Dubai, southeastern Arabia.

Excavations at Saruq al-Hadid, Dubai, UAE, discovered a stone tool technology with backed microliths dating to the Wadi Suq period and Late Bronze Age (ca. 1750–1300 BCE). The stone technology is a contemporary with metal production in the region, and the assemblage was recovered from a thick bone midden deposit at this multi-period site on the edge of the Rub’ al-Khali Desert. Small cobbles of chert were imported to the site and were reduced into flakes by hard-hammer percussion. Cores were frequently rotated during knapping and the reduction strategy was ad hoc, lacking hierarchical reduction stages. Flake tools were used as-is or modified by retouching. Some flakes were selected for backing into geometric microliths, and backing techniques often reflected high levels of stoneworking skill to produce stylised scalene shapes. A review of contemporary archaeological evidence, and the context of the Saruq al-Hadid assemblage, suggest that microliths may have been made as stone armatures for arrows despite the contemporary use of copper-based arrowheads.

FIVE SEASONS OF EXCAVATIONS IN AREAS 2A AND G OF SARUQ AL HADID (DUBAI, UAE): IRON AGE II EVIDENCES OF COPPER PRODUCTION, WORKSHOP AREA AND CEREMONIAL ACTIVITIES

Within five years of excavations in Area 2A and G of Saruq al-Hadid, several pit-like structures used in combustion activities were found whose purpose is still unclear. Near these, a rich collection of metal objects from the Iron Age II was gathered, along with evidences of their production at the site. Frequent identification of raw materials and working tools, mainly for jewellery production, suggests that the site was also a production centre for these kind of objects, as well as a site with religious connotation as suggested by the votive objects discovered, such as copper anthropomorphic figurines, snakes, miniature weaponry, and soft stone and ceramic vessels with parallels in other places of worship.

The provenance of early Iron Age ferrous remains from southeastern Arabia

Recent excavations at Saruq al-Hadid, Dubai, have recovered more than 200 kg of ferrous remains from early Iron Age contexts dated to c. 1250-800 BCE, transforming our understanding of the scale of early iron use in southeastern Arabia. Many of these ferrous artefacts show typological parallels with contemporary objects from Luristan in western Iran, and the possibility of their long-distance import from this well-known iron producing and using region has long been recognized. The present study uses material from Saruq al-Hadid and the contemporary site of Muweilah to explore the provenance of the earliest iron from southeastern Arabia, by (i) summarizing the evidence for the iron resources and technology in the region and adjacent areas; and (ii) compositionally analysing iron ores, iron slags and slag inclusions in artefacts from Saruq al-Hadid and Muweilah, alongside Iron Age ferrous artefacts from Iran, using OM, SEM-EDS, XRF, ICP-MS and LA-ICP-MS. Multivariate statistical analyses are used to explore these geochemical data, alongside a large dataset of ores and artefacts derived from existing geochemical and archaeological publications. The study identifies slag samples from Muweilah as originating from iron smithing activities, providing the first evidence for iron working of any kind in southeastern Arabia. Differences in the geochemical compositions of the material from Saruq al-Hadid and Muweilah and iron ores from the U.A.E. and Oman – particularly the distribution of rare earth elements – suggest that Iron Age ferrous artefacts from southeastern Arabia were not smelted from locally-available iron ores. Rather, the study demonstrates geochemical similarities between southeastern Arabian iron objects, contemporary objects from Luristan, and ores of the Sanandaj-Sirjan metallogenic belt of Iran, suggesting that iron may have been imported, at least partially as complete objects, from this region. Multiple source deposits are indicated, however, and the possible contribution of iron from other regions of ancient Western Asia and neighbouring regions remains to be further explored. The research provides critical new information regarding the long-distance exchange contacts of southeastern Arabia society during the floruit of the early Iron Age, in the late second and early first millennia BCE.

The bird remains from Saruq al-Hadid: Insights into human activity and the environment in late prehistoric southeastern Arabia

Excavations at Saruq al-Hadid, a late prehistoric (c.2000 BCE – c.800 BCE) site located in the Emirate of Dubai, U.A.E., have recovered several tonnes of animal bone. Due to a thorough sieving and retention strategy the remains of a range of taxa were collected, from camels to rodents. Within this wealth of material several dozen fragments of a variety of bird species were identified that have given a unique insight into human activity in the interior of southeastern Arabia; from sea birds (an unexpected find, given that the site is 40 km away from the current coastline), to a fragment of raptor that might reflect early hunting practices. The presence of certain bird species in the remains may also be indicative of the site's past environment and suggests it was likely different to the sparsely vegetated mobile dune field it is today. This paper outlines these remains, from their excavation to their analysis. The insights they provide into the nature of the occupation at Saruq al-Hadid are discussed, thereby demonstrating the great utility of studying even a relatively small assemblage of archaeological bird remains.

Preliminary insights into late prehistoric fish procurement strategies in the desert interior of southeastern Arabia: The results of LA-ICP-MS analysis of a fish otolith assemblage from Saruq al-Hadid, UAE

Fishing is known to have been an integral component of life in prehistoric coastal communities in southeastern Arabia and the recovery of fish bones from sites away from the coast indicates that fish were also an important resource at inland sites in this area. Recent excavations undertaken at the late prehistoric (c.2000–c.800 BCE) site of Saruq al-Hadid, UAE, a desert site located c.40 km away from Emirate of Dubai's coastline, have recovered a large assemblage of fish remains including a substantial number of sagittal otoliths from a variety of marine species. In this paper, we present the results of Laser Ablation ICP-MS analysis of the chemical composition of 143 sagittal otoliths recovered from Saruq al-Hadid and use the data to make preliminary inferences regarding the provenance, season of capture and method of preservation of these fish. We tentatively suggest that the otolith chemistries observed in this study indicate that fish from both the Persian Gulf and Omani coast are present at Saruq al-Hadid. Additionally, we are also able to rule out salting as a preservation method for the fish represented by these otoliths. However, we also highlight the extensive array of variables that may influence these data and acknowledge that the nature of the dataset prevents any firm conclusions being drawn regarding these topics at this stage in the study. Despite the limitations of this preliminary study, we argue that the otoliths from Saruq al-Hadid have significant research potential and conclude by outlining methods that might be employed to take this study further in the future.

Dating Persistent Short-Term Human Activity in a Complex Depositional Environment: Late Prehistoric Occupation at Saruq al-Hadid, Dubai

ABSTRACTThe archaeological site of Saruq al-Hadid, Dubai, United Arab Emirates, presents a long sequence of persistent temporary human occupation on the northern edge of the Rub’ al-Khali desert. The site is located in active dune fields, and evidence for human activity is stratified within a deep sequence of natural dune deposits that reflect complex taphonomic processes of deposition, erosion and reworking. This study presents the results of a program of radiocarbon (14C) and thermoluminescence dating on deposits from Saruq al-Hadid, allied with studies of material remains, which are amalgamated with the results of earlier absolute dating studies provide a robust chronology for the use of the site from the Bronze Age to the Islamic period. The results of the dating program allow the various expressions of human activity at the site—ranging from subsistence activities such as hunting and herding, to multi-community ritual activities and large scale metallurgical extraction—to be better situated chronologically, and thus in relation to current debates regarding the development of late prehistoric and early historic societies in southeastern Arabia.

Scrapping ritual: Iron Age metal recycling at the site of Saruq al-Hadid (U.A.E.)

This paper presents an integrated approach to the identification of complex re-processing operations of ancient ferrous artefacts from the multi-period site of Saruq al-Hadid, Dubai, United Arab Emirates. Spatial and morphological studies and a range of archaeometric analyses – optical microscopy, X-Ray diffraction, Micro-Raman spectroscopy, neutron tomography – are used to identify various processing markers preserved in these heavily corroded objects and to distinguish two groups of differently processed fragments. The main analytical focus is the investigation of corrosion layers preserving traces of hot oxidation and forging of metallic iron, along with re-heating of previously formed rust layers. The collected evidence suggests that the numerous iron artefacts ritually deposited of at the site in the early Iron Age were subsequently retrieved and re-forged into semi-products as a part of larger scheme of recycling operations, in which Saruq al-Hadid was a first node.

Early Iron Age ferrous artefacts from southeastern Arabia: investigating fabrication techniques using neutron tomography, optical microscopy, and SEM-EDS

The study presents a new approach for the investigation of ancient ferrous artefacts, by combining non-invasive and invasive techniques: neutron tomography, optical microscopy, and SEM-EDS, as applied to the objects from Saruq al-Hadid, U.A.E. It is revealed that despite the severe degradation of the objects, neutron tomography allows the detection of various features associated with the mechanisms of degradation and working (manufacturing, re-processing) of the ferrous artefacts including (1) different corrosion products and their specific distribution patterns; (2) surface dents from the use of hammers; and (3) various structural heterogeneities such as mineralised pierced holes, incised patterns, and ex-welding lines. The ex-welding lines present in every artefact have a major significance because they can be conveniently used for the investigation of the manufacturing techniques of the objects. The complementary invasive investigation via optical microscopy (OM) and SEM-EDS is used to relate the carburization patterns of the objects to their welding techniques, which are then associated with the patterns of variability of slag inclusion composition. The integrated data provide insight into the socio-technological aspects underlying the choices in the manufacturing of the Saruq al-Hadid objects, and broader aspects of early Iron Age iron-working in the ancient Near East.

Goldwork technology at the Arabian Peninsula. First data from Saruq al Hadid Iron Age site (Dubai, United Arab Emirates)

The Spanish team that leads a research project at Saruq al Hadid excavated an area where about 450 gold items were recovered during the campaigns from 2015 to 2017. The site with a lengthy occupation from the end of the fourth millennium to the Islamic period is well known for its important finds attesting copper metallurgy production during Iron Age II. Other rich archaeological finds in iron, stone and pottery, in some cases showing a snake iconography, point to a ceremonial place where production processes and exchanges took place.We present an archaeometric study of a significative sample of the gold items found at the site using OM (Optical Microscopy) and SEM-EDS (Scanning Electron Microscopy with Energy Dispersive Spectroscopy). Our provisional results suggest the existence of a workshop -the first archaeologically attested at the Arabian Peninsula- where lost wax casting and plastic deformation were usual practices, together with other goldwork techniques like polychrome alloying, filigree and granulation. Evidence of the production processes were workshop wastes and raw material, although no associated archaeological structures could be identified.

Integrating a complex late prehistoric settlement system: Neutron activation analysis of pottery use and exchange at Saruq al-Hadid, United Arab Emirates

Temporary sites were a critical component of the prehistoric Near Eastern economy but, because of their ephemeral nature, are less frequently the focus of research than sedentary settlements. The present article presents the results of neutron activation analysis conducted on pottery from the temporary site of Saruq al-Hadid, United Arab Emirates. The results identified both continuity and change in the pottery consumed at the site in the Bronze and Iron Ages, which suggests that the peoples gathering here were integrated into economic practices observed at sedentary sites throughout southeastern Arabia.

Saruq al-Hadid: a persistent temporary place in late prehistoric Arabia

ABSTRACTIn this paper, the authors use the site of Saruq al-Hadid – a ‘persistent temporary place’ located in the mobile dune fields of the north eastern edge of the Rub’ al-Khali desert – as a lens to focus discussion on the variable nature of temporary sites and mobile adaptations within the archaeology of southeastern Arabia, the relationships between temporary sites and permanent settlements, and the evidence for collective events and gatherings from later prehistory into the Islamic period. They discuss evolving arguments regarding sedentary and mobile sites and groups in Arabia from the Neolithic period to the Iron Age, and summarize the material record of human activity at Saruq al-Hadid. This research emphasizes the site’s changing significance as a temporary place and its emergence, in the early Iron Age, as a locus for periodic interaction between multiple community groups.

Conservation of archaeological artefacts in Saruq Al-Hadid

The article documents and discusses field conservation methods and procedures applied to metal artifacts, both copper and iron, discovered by the Polish team working at the Saruq al-Hadid archaeological site in the UAE (Emirate of Dubai) in 2016/2017 and 2017/2018. An overview is given of the conservation challenges that the state of preservation of the metal finds presented and the methods and procedures that were applied on the site, including brief case studies of the most important finds and treatments.

Three‐Dimensional Mapping of Archaeological and Sedimentary Deposits with Ground‐penetrating Radar at Saruq al‐Hadid, Dubai, United Arab Emirates

ABSTRACTA three‐dimensional model of aeolian deposits interleaved with layers of cultural materials was created from the results of a ground‐penetrating radar (GPR) survey at Saruq al Hadid, a multiperiod archaeological site located on the eastern fringe of the Rub al‐Khali desert in the United Arab Emirates. Results from this survey provide some context for artefacts collected in prior excavations and offer valuable insight into the physical processes that shaped the present manifestation of the site. Concentrations of artefacts within the dune deposits and the possible footprints of architectural installations have been located through the examination of two‐dimensional time slices and three‐dimensional depictions of isosurfaces. A three‐dimensional model of the dune interior, paired with absolute dates from related excavations, illustrates a history of occupation and sediment accumulation recorded at Saruq al‐Hadid that is consistent with chronologies of environmental change and settlement proposed elsewhere for the third through first millennia bce. Copyright © 2013 John Wiley & Sons, Ltd.