Modern technology has allowed for non-destructive research of archaeological materials. These new methods number many and all have their advantages and disadvantages. One of the most popular non...Show moreModern technology has allowed for non-destructive research of archaeological materials. These new methods number many and all have their advantages and disadvantages. One of the most popular non-destructive devices used for material analysis is portable X-ray fluorescence (pXRF) machines. This thesis examines the various advantages and disadvantages of these machines, how they are used in an archaeological and conservation/museum context. Case studies have been collected and compared to an oversight of how pXRF machines are being used. The thesis concludes that pXRF devices are reliable, easy to use, cheap, non-destructive and informative devices. They also have consistent flaws such as the limited depth x-rays can penetrate, results that are not as precise as other methods and the 'point and shoot' mentality that it spawned. These problems can all either be solved or be compensated for.Show less
Research master thesis | Archaeology (research) (MA/MSc)
under embargo until 2025-08-31
2025-08-31T00:00:00Z
Northern Gaul in Merovingian times (450-650 CE) is well known for its characteristic pottery assemblages in settlement- and burial sites consisting of wheel-thrown ceramics. Rooted in Roman...Show moreNorthern Gaul in Merovingian times (450-650 CE) is well known for its characteristic pottery assemblages in settlement- and burial sites consisting of wheel-thrown ceramics. Rooted in Roman traditions, these ceramics were produced in specialized potters workshops of which the majority was located along the rivers Rhine and Meuse. Another group of pottery, the handmade ceramics, however, are often given less attention. These handmade pots have often been perceived and described by archaeologists as rudimentary, poorly made and of low quality. In addition, they have been associated with Germanic culture. This is often followed by the assumption that this type of pottery is, in stark contrast to the wheel-thrown ceramics, made by unskilled potters, and therefore made locally on an occasional level in a household setting by woman and children. These claims are however based on modern assumptions only, since the production aspects of these handmade ceramics have hardly been studied. Furthermore, they show a strong bias that is rooted in our history with the industrial revolution and capitalism, and in value-associations and preconceptions regarding Roman and Germanic culture. The way archaeologists perceive and value these handmade ceramics should therefore not be mistaken for the perception and valuation of these ceramics by the early medieval societies that created and used them. By using an integrated chaîne opératoire approach that considers the technological, social and symbolic dimension of the production of ceramic vessels, this thesis attempts to gain insights on the production, perception and value of these handmade ceramics in the early medieval societies of Northern-Gaul. The ceramic assemblage of the recently excavated Merovingian cemetery of Nijmegen-Lentseveld (The Netherlands) was chosen as a case-study. At this site, roughly dating to the 6th century, an notably high concentration of handmade ceramics was found, together with well-known wheel-thrown vessels. This provided the unique opportunity to study both handmade and wheel-thrown ceramics together. A technological analysis, using a combination of macroscopic-, petrographic- and chemical techniques, was performed on the Lentseveld assemblage as well as on several local reference ceramics and clay samples. The results show that the production of the handmade ceramics found at the cemetery of Nijmegen-Lentseveld, was more complex than the assumed local household production. It is demonstrated that a large majority of the handmade ceramics from the site were made with a clay with very similar properties, that does not match with the clay samples collected in the vicinity of the site, nor with the known local ceramic productions. Although it was not possible to conclude with certainty whether the exact same clay source was used to create all ceramics and determine the location of such clay source, it can be concluded that the clay most likely was collected further away from the site and should be sought at a more regional level. The fact that there appears to be a consensus on the type of clay deemed suitable to create these ceramics and a similar or the same clay source was used for a large group of handmade ceramics, suggest the clay collection was rather well organized. This contradicts the previous assumptions of local household production whereby each household collects their own clay at a source near their house. The integrated chaîne opératoire approach used in this thesis has furthermore shown that production entails more than just technological actions, and also has a strong social and symbolic dimension. It uncovered the many material-, social – and imagined values that could have been associated with (the production of) handmade ceramics, such as the act of crafting itself, the transformation by fire and the value of materials. This shows that the perception and values attributed handmade ceramics by the early medieval societies of Northern Gaul who created and used them were mostly likely very different from negative perception and values projected onto these ceramics by archaeologists. This thesis therefore shows that there is a strong need for a re-evaluation and foremost a re-valuation of these handmade ceramics, and has taken the first step in doing so by taking a different approach to analysing them with the help of a case-study.Show less
Umhlatuzana rock shelter is a site first excavated in the 1980s located in the ZwaZulu-Natal province, South Africa. About 70.000 years of human activity are represented at the site without...Show moreUmhlatuzana rock shelter is a site first excavated in the 1980s located in the ZwaZulu-Natal province, South Africa. About 70.000 years of human activity are represented at the site without occupational hiatuses, which is rarely found in the region. A recent (2018-2019) fieldwork campaign by a team from Leiden University has unearthed thousands of lithic artefacts dating between the Middle Stone Age and Later Stone Age. This thesis aims to determine the raw material composition of a sample of 100 recently excavated lithics, coming from two different spits dating to the end of the Howiesons Poort and to the Late Middle Stone Age periods. The results from the two spits are compared to identify any chronological patterns of variation. The results are then related to the raw material proportions reported from the first excavation. A combination of visual and geochemical (PXRF) analyses is used to identify different rock types and to test the accuracy of visual determination for raw material classification. The main rock types identified in the sample are hornfels, sandstone and quartz, accompanied in smaller amounts by other materials such as quartzite and ironstone. The data obtained suggests continuity in raw material choice from the Howiesons Poort to the Late MSA period and purposefulness in the selection of different rock types for different uses. The evidence aligns in this aspect with other nearby sites, such as Sibudu and Umbeli Belli. The exact raw material proportions of the spits, however, are unlike what is seen elsewhere, and do not conform with the results presented by J. Kaplan, the original excavator of the site. Raw material choice is fundamental to the toolmaking process and integral to our understanding of past hunter-gatherer lifeways. The study presented here adds to a growing body of evidence on the southern African Middle Stone Age, furthering the current knowledge on the behaviors of early Modern Humans.Show less
In chemical analyses studies of archaeological ceramics, high phosphorus concentrations are found regularly. Over the past decades multiple hypotheses regarding the origin of these high levels have...Show moreIn chemical analyses studies of archaeological ceramics, high phosphorus concentrations are found regularly. Over the past decades multiple hypotheses regarding the origin of these high levels have been given, concerning the manufacture, use and burial environment of the ceramics. By focussing on how the phosphorus is distributed within the ceramic body and in which (mineral) form(s) it occurs, this thesis aims to gain a better understanding in the origin of these high phosphorus concentrations. This, in order to determine the potential of ceramic phosphorus analyses for archaeological research. A selection of ceramics with high levels of phosphorus was taken out of assemblages from four archaeological sites in the Netherlands: Maastricht Cannerberg (LBK), Voorschoten De Donk (middle and late Neolithic), Zandwerven (middle and late Neolithic) and Nijmegen Kops Plateau (Roman). Their chemical composition was analysed using XRF, after which an optical analysis using polarizing light microscopy and fluorescence microscopy was carried out. Multiple deposits with different optical properties were found within the voids of the ceramic body. SEM-EDX was used to analyse the chemical composition of these deposits, as well as the chemical composition of the ceramic fabric itself. This study demonstrates phosphorus is present in large concentrations within the deposits in the voids, while the ceramic body has much lower concentrations. Since these voids have been formed during or after the firing process of the ceramics, there are no indications for accumulation of phosphorus during the manufacturing process of the ceramics. The SEM-EDX analysis of the deposits indicates the presence of different phosphate compounds, containing Ca, Fe and/or Al. No visible traces of chemical weathering were found within the ceramics, indicating the Al-phosphates, present in some of the deposits, did derive from the burial environment. Given that there are several different deposits that contain high phosphorus concentrations, there are potentially multiple mechanisms involved in this phenomenon.Show less
This thesis deals with two types of coins minted in Dorestad during the reign of Lothar I (840-855), and with their production and its organisation. The hoards of Tzummarum II, Roermond and...Show moreThis thesis deals with two types of coins minted in Dorestad during the reign of Lothar I (840-855), and with their production and its organisation. The hoards of Tzummarum II, Roermond and Westerklief II, made it possible to do an intensive die-study on both coin types (Type 1 and Type 2). A comparison between the created die-chains of Type 1 showed a change in the metrological aspects and designs of these coins. The hhXRF analysis of the coins of Type 1 showed a degradation of the silver content from around 90 to 60% over time. This is in contrast to the coins of Type 2, of which the silver content remained 90%. The emperor’s name and title were always written incorrectly, unlike the mint name Dorestad. This fact implies deliberate wrongly spelling of the name and title of emperor and may be interpreted as making a statement against Lothar I from the Viking(s) that kept Dorestad as a beneficium. The metrological characteristics and designs of the die-chains of Type 1 strongly suggest that these coins were all struck in the same workshop. A cautious estimation of the coins of Type 1 is 4.2 million and 190,000 coins of Type 2. The extended chaîne opératoire was developed to theorize the steps within the production of coins in an attempt to better understand this process. It shows that the production of a coin consists of three different phases, which can change independently from one another. The four parameters by Costin on the late medieval coin production were applied in order to help to understand how coin production could have been organised in Dorestad.Show less
This thesis focusses mainly on Neolithic ornaments made of jet and seeks to interpret these finds by addressing two objectives. The first objective of this thesis is concerned with characterizing...Show moreThis thesis focusses mainly on Neolithic ornaments made of jet and seeks to interpret these finds by addressing two objectives. The first objective of this thesis is concerned with characterizing the black shiny ornaments of Schipluiden and Ypenburg which have preliminarily been termed jets and to further investigate the possibilities of provenance studies for Dutch Neolithic jet ornaments with the use of XRF. The second objective of this thesis is to investigate the possibility of distinguishing between an intentional polish and use-wear related shine on the basis of macroscopic analysis. For this purpose a series of experiments has been designed involving experimentally made ornamental beads and a rock tumbler. An XRF distinction shows that the finished ornaments of Ypenburg are possibly all true Upper Lias jets. A large amount of the objects under investigation are probably not, however, including all finished ornaments from Schipluiden. It has proven possible to distinguish between an intentional polish and a use-wear related shine. This experiment, although insightful, is incomplete as it lacks the evidence to conclusively distinguish an intentional polish from a use-wear related shine. Similar experiments could be set up for future research with longer tumbling durations and allow the use of different polish materials.Show less
