Episodic fluid flow within continental rift basins: some insights from field data and mathematical models of the Rhinegraben

Vitrinite reflectance data from a petroleum exploration well in the northern Upper Rhinegraben show an unusual vertical maturity trend. Above and below a 500 m thick marl layer the vitrinite reflectance levels are consistent with modern, conductive, geothermal gradients. Between about 1000 and 1500 m depth, however, vitrinite reflectance levels are significantly elevated (about 0.6%Ro). This anomaly cannot be explained with one‐dimensional conductive or conductive–convective heat transfer models, and thermal effects of sedimentation or igneous intrusion seem implausible for this geological setting. The thermal anomaly that formed this maturation anomaly must have been hydrothermal in origin, two‐dimensional in nature, and persisted long enough to elevate the vitrinite reflectance values within this marl unit, yet it must have dissipated before the thermal perturbation would have altered the organic matter below and above the unit. In this study, we propose that the vitrinite reflectance anomalies were caused by a transient thermal inversion induced by episodic, lateral flow of hot (130–160°C) groundwater along conductive fractures and bedding planes. Heat flow constraints suggest that fluids must have moved rapidly up a vertical feeder fault from a depth of at least 3.6 km before migrating laterally. To test this hypothesis, we present a suite of simple, idealized mathematical models of groundwater flow, heat transfer, thermal degradation of kerogen and vitrinite systematics to explore the episodic flow that could have produced the observed thermal anomaly. In these simulations, a single, horizontal aquifer is sandwiched between two less permeable units: the total dimensions of the vertical section model are 4 km thick by 10 km long. The top of the aquifer coincides with the position of the observed thermal maturity anomaly in the Rhinegraben. Boundary conditions along the left edge of this aquifer were varied through time to allow for the migration of hot fluids out into the basin. Inflow temperature, horizontal velocity, duration and frequency of flow and thickness of the aquifer were varied. We found that a thermal maturity anomaly could only be produced by a rather restrictive set of hydrothermal conditions. It was possible to produce the observed vitrinite reflectance anomaly by a single hydrothermal flow event of 130°C fluid migrating laterally into the aquifer at a rate of 1 m a^?1 for about 10 000 years. The anomaly is spatially confined to near the left edge of the basin, near the feeder fault. If the flow event lasted longer than 100 000 years, then the maturation anomaly disappeared as the lower confining unit approached steady‐state thermal conditions. It is possible that such an event occurred about 5 million years ago in response to increases in fault permeability associated with far field Alpine tectonism.     

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.     

Late pre‐Islamic burials at Mleiha,Emirate of Sharjah (UAE)

The history of two monumental grave buildings (nos. 4 and 5), excavated in area P of the late pre‐Islamic city of Mleiha, has been studied in detail. Like all other tombs excavated up to the present day in Mleiha, their chambers had been emptied in ancient times. They were found devoid of human remains and grave‐goods. In the upper parts of the grave fills, however, skeletal remains were encountered. One of the skeletons was radiocarbon dated to AD 623–656, the time of the Islamisation of south‐east Arabia. A radiocarbon date of 384–233 BC for a wooden beam from the same tomb showed that it was built during the late pre‐Islamic period (PIR‐A). These dates and stratigraphic observations made clear that the interments were intrusive. The surrounding sediments were deposited by flooding. Directly underneath the skull of the dated skeleton, a layer of sandy loam was encountered, showing mud cracks. To understand the relationship between the burial and these deposits, micromorphological analyses of the surrounding sediments were conducted. The microstructural organisation of the sedimentary components implied that the skull was interred as part of a burial, and not deposited by natural processes.     

Sagittal Clefting of the Fifth Lumbar Vertebra of a Young Adult Female from Apollonia Pontica,Bulgaria

A rare congenital anomaly in the form of sagittal clefting of the fifth lumbar vertebra was observed in the skeleton of a young adult female excavated from the Greek colonial site of Apollonia Pontica (5th to 3rd centuries BC) on the Bulgarian Black Sea coast. No compensatory changes had occurred to the adjacent vertebrae, and no other skeletal anomalies or pathological conditions were observed in the skeleton. This anomaly, the first of its kind documented in ancient Greek remains, was likely asymptomatic and of no clinical significance. Copyright © 2012 John Wiley & Sons, Ltd.     

奉节县头堂包遗址2002年发掘简报

重庆奉节头堂包遗址于1992年被发现,2002年共发掘1000平方米。发现灰坑一座,在海拔115-135米左右的断崖上清理砖室墓两座。发现完整和可复原的器物共计60余件。此次发掘的遗存包含了汉代、宋代和明清三个时期,本文按单位对此次发掘获得的材料进行了详细介绍与初步分析。     

Possible cases of scalping from pre‐hispanic highland Peru

For years, the pre‐Hispanic Chachapoya of Northern Peru have been described as the ‘Warriors of the Clouds’. A more detailed look at newly excavated osteological samples from the highland site of Kuelap allows us to better examine the types of traumatic injuries among the Chachapoya. This paper describes an individual with evidence of a recent scalp removal including cut marks encircling the vault and a large area of active inflammatory response due to exposure of the outer table. The degree of osseous response and a small area of healing indicate short‐term survival. A second fragmentary skull demonstrates similar features but more advanced healing. The location and patterning of the cut marks are consistent with North American Indian pre‐historic and historic cases of scalping. The skulls of these two individuals provide the first osteological evidence of scalp removal from a pre‐Hispanic South American Andean context, although it is difficult to determine the motivation whether for therapeutic treatment or trophy taking. These cases, along with other evidence of interpersonal violence and cranial trauma, serve to elucidate the possible volatile nature of cultural contact between this region and lowland Amazonian tribes, where scalps and trophy heads were commonly taken in raids. Copyright © 2009 John Wiley & Sons, Ltd.     

A Study Of The Firing Technique Of Pottery From Kaman‐Kalehöyük,Turkey, by Synchrotron Radiation‐Induced Fluorescence X‐Ray Absorption Near‐Edge Structure (Xanes) Analysis*

Fe K‐XANES spectra of a series of pottery sherds excavated from the archaeological site of Kaman‐Kalehöyük, Turkey, were measured to reveal the firing technique of the pottery. The analysis disclosed relationships among the chemical form of the iron, the firing conditions and the colour of the pottery. The pottery referred to as ‘Grey Ware’ found at this site was classified into two groups according to the chemical form of the iron. Also, it was revealed that the Iron Age pottery referred to as ‘Cream Ware’ was produced first under reducing conditions, and then fired under oxidizing conditions.     

METHODOLOGICAL DEVELOPMENTS IN THE LUMINESCENCE DATING OF BRICK FROM ENGLISH LATE‐MEDIEVAL AND POST‐MEDIEVAL BUILDINGS*

Fired clay brick samples, obtained from a group of seven high‐status late‐medieval and post‐medieval buildings in England ranging in age from c. ad 1390 to 1740, were dated by the luminescence method using an optically stimulated luminescence (OSL) technique. The results obtained indicate that, when applied to quartz extracted from brick, the technique is capable of producing dates that are in consistently good agreement with independent dating evidence for the buildings. For six samples taken from a group of four dating ‘control’ buildings the mean difference between the central values of luminescence and assigned ages was 5 ± 10 years (SD, n = 6). The methodology used is appropriate for application to other standing buildings in other temporal and geographic regions, and may be used with confidence where conventional dating methods are less certain. The study also examines the luminescence characteristics of quartz and the characteristics of the lithogenic radionuclides in brick samples and identifies various aspects related to the assessment of experimental uncertainty in testing the reliability of the method.     

Examples of Mediæval Seals. Seals preserved at Wisby in Gottland

Limited excavations were undertaken between 1975 and 1982 in two areas: south of the upper ward gatehouse and in the area of the lower ward eastern entrance. The excavations revealed traces of four bridges, one of which had left clear evidence of the design of its timber piers. Archaeological evidence suggests that all four bridges date from no later than the middle years of the twelfth century. The eastern gatehouse was shown to be a comparatively insubstantial structure, in spite of a major rebuild, suggesting that the main defence in this area was concentrated forward on the great barbican. The latter awaits future investigation. Limited re-examination of the structure of the lower ward Westgate and finds from this area enabled a sequence of gatehouse development and use to be suggested. South of the upper ward gatehouse excavations uncovered two substantial pits; the southern one was a lime kiln, sealed by construction of the successive bridges to the upper ward, and probably associated with the building of the ‘country house’ in the 1070S. The second pit, on the northern side of the upper ward ditch to the south-west of the upper ward gatehouse, could not be fully excavated and its purpose is rather more enigmatic; it was most likely another lime kiln. Investigation of the original topsoil on the northern lip of the upper ward ditch has identified early occupation levels apparently preceeding construction of the country house.     

The Byzantine‐Period Dor 2006 Shipwreck,Israel: preliminary hull construction report

The Dor 2006 shipwreck was discovered in 2006, 100 m offshore, 800 m south of Dor (Tantura) lagoon. The wooden hull remains included sections of large frames, stringers and ceiling planks, a large number of strakes and wales, some with unpegged mortise‐and‐tenon joints. Among the finds were ceramic sherds, wooden objects, matting, ropes, food remains, and coins. The shipwreck was dated to between the second half of the 6th and the first quarter of the 7th centuries AD. The wooden components of the hull indicate a large ship compared with other shipwrecks of the period, and the largest ever excavated in the Dor area.     

Resistance,Symbolism and the Language of Stateness in Timor‐Leste

On gaining independence in 2002 after a protracted struggle against Indonesian occupation, the sovereign Timor‐Leste state began to assert its sovereignty in a range of discursive and expressive media. These assertions developed a distinct ‘language of stateness’ that is the focus of this article. This East Timorese expression of state sovereignty draws heavily on the legacy of the Timorese resistance struggle and on a variety of other sources of symbolic power such as flags, buildings, logos, and uniforms. Yet these efforts have been contested by a range of non‐state actors in Timor‐Leste and the shape that this language of stateness has taken now evokes complaints from martial arts groups (MAGs), ritual arts groups (RAGs), and veterans' organisations that seek to ‘become like the state’ themselves, and who also employ a ‘national language of stateness’ in the form of flags, graffiti, and official buildings. While not challenging the idea of an independent East Timorese state per se, these groups question the prerogative of the state to use and define the language of stateness. In this article I explore the way the state and its challengers use ‘languages of stateness’ and how this shapes their ambivalent stance vis‐à‐vis each other, with both sides often drawing upon a discourse of the fulfilment of the millenarian promises that have for a long time been tied to the achievement of independence.     

COMPOSITION PROFILES AND TIME EVOLUTION OF BURIED MARBLE PATINAS BY LA–ICP–MS AND LASER‐INDUCED MICRO‐PHOTO‐LUMINESCENCE

The present work aims to study surface composition profiles on buried marbles as well as their time evolution. Fifty samples from gravestones, buried for up to 80 years, were analysed by laser‐induced photoluminescence and LA–ICP–MS. The results include profiles of ²⁵Mg, ²⁷Al, ⁵⁵Mn, ⁵⁷Fe, ⁸⁸Sr and organic complexes of calcium, existing in the marble patina. The depth at which ⁸⁸Sr reaches its bulk value proved to be the best parameter to measure patina thickness. A diffusion model adopted from dissolution studies made on gravestones exposed to the atmosphere was successfully applied to the patina thickness data. The model fails to predict patina thicknesses for ancient excavated objects. However, it seems that ‘Sr alteration depth’ values alone can be used for discriminating ancient from recently buried surfaces.     

THE ANALYSIS OF DYESTUFFS FROM FIRST‐ TO SECOND‐CENTURY TEXTILE ARTEFACTS FOUND IN THE MARTRES‐DE‐VEYRE (FRANCE) EXCAVATIONS*

A series of Gallo‐Roman clothes and miscellaneous textile fragments from the first and second centuries from the Martres‐de‐Veyre necropolis (Puy‐de‐Dôme, France) was investigated. The objects studied were excavated between 1851 and 1923, during successive rounds of archaeological work. Since that time, they have been conserved in the Barguin Museum at Clermont‐Ferrand. The target of our research was dye identification, as it gives very interesting and useful information regarding the ancient technology. This approach has until now not been considered to be relevant and, unfortunately, is not systematic. The analysis was carried out by high‐performance liquid chromatography with photodiode array detection (HPLC–PDA). The small samples (threads up to 0.6 mg, less than 1 cm long) of coloured textile fibres were submitted to this technique. In one case, X‐ray fluorescence (XRF) analysis was applied. According to the analysis, the dyeing sources proposed are the Rubiaceae family for red, a luteolin ‘base’ for yellow, ellagitannins for brown and indigo for blue colours. Several samples did not seem to contain any dye. We point out possible factors for the partial dye source determination: instrumental limits, sample size, low dyestuff content in analysed samples and the dyes’ decomposition during ageing. Some improvements of dye analysis in archaeological samples by separation techniques based on recent analytical instrumentation and combined approaches are proposed.     

Flint and Quartzite: Distinguishing Raw Material Through Bone Cut Marks

Since the 1980s, several experimental analyses have been able to differentiate some lithic tool types and some of their raw materials according to the morphology of cut marks imprinted by such tools when used for butchering activities. Thus, metal tool use has been differentiated in contexts with an abundance of lithic tools, or even the use of hand axes has been documented in carcass processing, in contrast with simple unretouched or retouched flakes. As important as this information is, there are still other important aspects to be analysed. Can cut marks produced with different lithic raw material types be differentiated? Can cut marks made with different types of the same raw material type be characterized and differentiated? The objective of this study is to evaluate if cut marks resulting from the use of different flints and different quartzites are distinguishable from each other. In the present work, an experimental analysis of hundreds of cut marks produced by five types of flint and five varieties of quartzite was carried out. Microphotogrammetry and geometric–morphometric techniques were applied to analyse these cut marks. The results show that flint cut marks and quartzite cut marks can be characterized at the assemblage level. Different types of flint produced cut marks that were not significantly different from each other. Cut marks made with Olduvai Gorge quartzite were significantly different from those produced with a set comprising several other types of quartzites. Crystal size, which is larger in Olduvai Gorge quartzites (0.5 mm) than Spanish quartzites (177–250 μm), is discussed as being the main reason for these statistically significant differences. This documented intra‐sample and inter‐sample variance does not hinder the resolution of the approach to differentiate between these two generic raw material types and opens the door for the application of this method in archaeological contexts.     

Khirbat al‐Mana‘iyya: an early Islamic‐period copper‐smelting site in south‐eastern Wadi ‘Araba,Jordan

Recent excavations in south‐eastern Wadi ‘Araba in Jordan have revealed the first early Islamic‐period copper‐smelting site known in the eastern side of the valley, which extends south of the Dead Sea to the Gulf of ‘Aqaba. Five test pits were excavated in 2012 at Khirbat al–Mana‘iyya, a prominent copper‐smelting camp in south‐eastern Wadi ‘Araba, Jordan. The results of these excavations demonstrate that the site was primarily active in the seventh–ninth century AD. Its distance from the copper sources of south‐west ‘Araba suggests that its location was chosen based on proximity to wood and water resources, rather than copper ore deposits. The discovery that the site dates to the early Islamic period has implications for previous and future work in south‐east ‘Araba. In particular, it challenges the common—until now—view of the region as virtually devoid of settlement during this period.     

‘The Ghost Ship’. An Intact Fluyt from c.1650 in the Middle of the Baltic Sea

We report an exceptionally well preserved 17th‐century shipwreck in the Baltic Sea. The investigation of the intact 3‐dimensional hull at 130 m depth in the cold dark water has demanded new methods of documentation. Field investigation of ‘The Ghost Ship’ has been done in co‐operation with a nautical survey company, combining archaeological skills with advanced technology and filming for a television documentary. The discovery offers detailed knowledge about Dutch shipbuilding and the construction of fluyts. We also believe that study of the social organisation aboard this small trading ship can give insights into the mentality and ideology of the period. © 2012 The Authors     

History in Two Dimensions or Three? Working Class Responses to History

Research carried out by the author in North Carolina (2007) aimed to assess how museums might help rebuild identity in communities devastated by economic decline. Interviews, compared with examples from ‘Time and Tide’, Yarmouth, UK, suggested that working class people feel a strong need for history, intense emotional ties to the industrial landscape, and believe that museums can radically change their lives. The evidence suggested that the importance of history to people’s sense of self has been underestimated, particularly in the case of the industrial poor. This paper considers reasons for this underestimation, and suggests that these groups may also have higher and more wide‐ranging expectations of history than intellectuals do. It suggests these ‘emotional’ uses of history, rather than being inferior to academic history, may be richer, and that this ‘three‐dimensional’ experience of history exhibited by the urban poor can enrich the two‐dimensional historical experience of the researcher or museums professional.     

The pit: landscape scars as potential cultural tools

A huge and continuously growing pit is about to divide the Swedish mining town of Malmberget into two halves. What once was the town centre is now a 200 metres deep hole, and private homes and key buildings like the old school and the church have had to be demolished or moved. The pit is a human imposed ‘landscape scar’ epitomising the town’s lost golden age of mining, its present situation of decline and uncertain future prospects – despite a recent recovery in the mining industry. Although the pit is decisively present in the local community, it is not articulated as significant, especially not from a heritage perspective. Why is this so? In this article, we examine the pit as a potential cultural tool for heritage processes, and find that it is indeed used by individuals in this respect, but not in collective memorialisation. We conclude that landscape scars definitely can constitute critical cultural tools, although they may not always need to be labelled as belonging to an ‘authorized heritage discourse’. Instead, the potential of the landscape scar is to enhance the amount and recognition of shared memories in the local community.     

DISTINCT,LATE BRONZE AGE (c. 1650 bc) WALL‐PAINTINGS FROM AKROTIRI,THERA, COMPRISING ADVANCED GEOMETRICAL PATTERNS*

This paper studies a set of wall‐paintings of the Late Bronze Age (c. 1650 bc ) initially decorating the internal walls of the third floor of the edifice called ‘Xeste 3’, excavated at Akrotiri, Thera, whose restoration is now in progress. It deals with the methods used for the drawing of the geometrical figures appearing in these wall‐paintings. It is demonstrated that most of the depicted configurations correspond with accuracy to geometrical prototypes such as linear spirals and canonical polygons. It is pointed out that the steady lines of the figures, their remarkable repeatability, the precision of the geometrical shapes and their even distribution in the wall‐paintings indicate a very distinctive use of the ‘Xeste 3’ third floor, which is now investigated.     

Non-invasive archaeological exploration in stratigraphically complex rural settings: an example from Ferento (Viterbo, Italy)

This paper presents the results of a ground penetrating radar (GPR) survey conducted in the rural area of the ancient city of Ferento near Viterbo (Northern Latium, Italy), where the visible ruins testify an uninterrupted history from the Etruscan to the Medieval period. The soil covering the ruins has been intensively ploughed, cultivated and used for pasture over the centuries, and is characterised by a high content of clay minerals. In this scenario, the use of GPR is particularly difficult due to both possible ‘false positive anomalies’ and strong signal attenuation. In order to reconstruct the geometrical shape and size of the geophysical anomalies related to a medieval dwelling, multi-profile GPR data were collected in two different areas, using radar equipped with 250-MHz antennas. 2D and pseudo-3D migrated maps were created and signal velocity analysis was performed to estimate the target depths. Despite the clayey-calcareous material, the results show a good signal penetration and allow a clear reconstruction of the shape of the buried ruins, confirming that the anomalies are due to medieval buildings located at a depth in agreement with what was observed on the archaeological stratigraphy. Furthermore, our study suggests that in radar data interpretation, caution should be used if the surveyed area was subjected to prolonged and intensive agriculture.