Statistical matching is a technique which can be applied when one wants to investigate the joint relationship between two variables that are observed in different datasets, using one or more...Show moreStatistical matching is a technique which can be applied when one wants to investigate the joint relationship between two variables that are observed in different datasets, using one or more variables that overlap in both datasets. This joint relationship cannot be estimated without relying on assumptions or additional data. Classically, statistical matching is based on the Conditional Independence Assumption (CIA) which asserts the non-overlapping variables to be independent given the overlapping variable. This assumption is inflexible, untestable and often does not hold. The current project proposes to use an approach based on the Instrumental Variable Assumption (IVA). An instrumental variable is a variable that, given the value of some mediating variable, has no effect on some outcome variable. In the context of statistical matching this gives rise to three scenarios: the mediating variable overlaps, the outcome variable overlaps, or the instrumental variable overlaps. The IVA approach is more flexible than the CIA approach. This is because the IVA approach does not make any assumptions on which variable is the overlapping variable, whereas the CIA always conditions on the overlapping variable. The aims of the current study were twofold: 1) how does the IVA approach perform when the assumption is violated to various degrees and 2) how does the IVA approach compare to the CIA approach. To answer these questions, a simulation study was performed. For each scenario, joint probabilities of the non-overlapping variables were estimated under both the IVA and the CIA in populations which violate the IVA to various degrees. Measures for the bias, accuracy and precision were estimated and compared. The results indicate that the IVA approach is moderately robust against slight violations of the assumption. When the IVA is not violated, estimations are unbiased and for all matching scenarios the method outperforms the CIA. When the IVA is violated it is advisable to rely on the CIA, since results of the current simulation study suggest the CIA to be more robust against violations in general.Show less
This thesis investigates the daily life of an early medieval community in Central Italy by focusing on the skeletal collection (n = 66) from the ancient site of Satricum dating between the 9th and...Show moreThis thesis investigates the daily life of an early medieval community in Central Italy by focusing on the skeletal collection (n = 66) from the ancient site of Satricum dating between the 9th and 11th century AD, to advance our understanding of this everchanging period. The research employs the study of paleopathology, with a focus on osteoarthritis (OA), osteochondritis dissecans (OD), and periosteal new bone growth (PNB). The skeletal analyses revealed a high prevalence of joint degeneration, particularly in the spine, hip, shoulder, and elbow, while also PNB was recorded in relatively high numbers. The findings suggest that Satricum was a small, self-reliant community engaged in agricultural practices with ongoing physiological stressors. However, the presence of OA might have been influenced by both activity and genetic predisposition due to the long duration of the community settling in Satricum. The study also explored the impact of sex and age. The osteological assessment indicated a potential surplus of males, aligning with demographic patterns of early medieval times, while the identified females showed no distinctive activity markers, prompting further investigation into the "missing women" concept of the Middle Ages. The presence of only five subadults also raised questions about community beliefs, suggesting a potential societal distinction for individuals under the age of seven since no social separation was recognized between the adults and juveniles over that age. Furthermore, the funerary practices exhibited potential indicators of a Christian belief system, such as burial orientation and the absence of grave goods. The reuse of a Roman villa with a possible apsis also hinted at the presence of an ecclesial building. Comparisons with other Central Italian sites of the same period (Albano, Santa Severa, and Colonna) highlighted pathological and demographic commonalities. Therefore, in the broader context, this research contributes to existing knowledge by confirming scholar’s theories about life in rural medieval Central Italy. Finally, this study emphasizes the significance of investigating previously unstudied skeletal collections because these findings not only deepen our understanding of Satricum but also provide a foundation for future research, encouraging diverse approaches to further unravel the complexities of this ancient community.Show less
Since the formation of the contemporary Northern-Spanish autonomic community of Cantabria in 1981 the Iron Age has become increasingly important for its regional identity, symbolically embedded in,...Show moreSince the formation of the contemporary Northern-Spanish autonomic community of Cantabria in 1981 the Iron Age has become increasingly important for its regional identity, symbolically embedded in, for example, its name and flag. Although this in itself can be viewed as problematic, it also fuelled more archaeological investigations into Iron Age Cantabria. These investigations have mainly been focused on Iron Age hillforts of which currently approximately fourty-three (43) can be found throughout the autonomic community. The relatively late development of this field of study is one of the reasons why this number is significantly lower than the other northern Spanish autonomic communities of Asturias and Galicia. Simultaneously, Eucalyptus plantations have become the dominant form of forestation covering approximately 8% of total ground surface and forming 19% of the total amount of forests in Cantabria. This vegetation cover is found predominantly in the coastal region, where few of the identified Iron Age hillforts are found and where the plantations encroach on identified hillforts, making identification of new hillforts more difficult. While new digital tools and data for cultural resource management have become available, such as Light Detection and Ranging (LiDAR) and Geographic Information Systems (GIS), their usage have been limited in this region. To address this issue the research poses the question: ‘How can available methods and tools of archaeological prospection and cultural heritage management be used in an integrated workflow to find, map and preserve Iron Age hillforts under Eucalyptus plantations in Cantabria?’. The proposed integrated workflow consists of narrowing down suitable locations for Iron Age hillforts through object-based predictive modelling (OBPM) and subsequently remote prospection of those locations to identify potential features associated with archaeological sites. To test this approach it has been put into practice. The proposed workflow proved effective, but has also shown limitations. The parameters chosen are most-likely not solely relevant for Iron Age hillforts, consisting out of Geomorophon, incoming visibility-index and out-going visibility index. Also the research focus on Eucalyptus plantations showed a variability of noise in the Digital Elevation Model (DEM) for locations under Eucalyptus plantations, sometimes impeding readability of those areas. Nevertheless, the use of Sky View Factor (SVF) and the sufficiently narrowed down study area still proved effective in finding and documenting possible archaeological features, of which fifty (50) different locations have been identified with a variation of characteristics, all adhering to the set parameters. This suggests that the proposed integrated workflow is currently an effective tool in the finding, mapping and preserving archaeological sites near or encroached by Eucalyptus plantations.Show less
Prediction models play a paramount role in various fields such as psychology and medicine, where the aim is to maximize predictive performance while ensuring high interpretability and stability....Show morePrediction models play a paramount role in various fields such as psychology and medicine, where the aim is to maximize predictive performance while ensuring high interpretability and stability. Prediction rule ensembles are a recent statistical learning method that address the black-box problem from common machine learning methods. First, an ensemble of trees is fitted, and by employing sparse regression, such as the lasso, only a subset of those trees is retained in the final ensemble, enhancing interpretability. However, the lasso suffers from drawbacks, considering that the optimal penalty parameter for variable selection may lead to an over-shrinkage of large coefficients. This study investigates if accuracy, sparsity, and stability of prediction rule ensembles can be improved by using the adaptive or relaxed lasso, or their combination. In the adaptive lasso, weight parameters are assigned to each coefficient in the penalty term, while in the relaxed lasso the lasso coefficients are debiased towards unpenalized values. In addition, in this study we compared if the results differ if the model selection was based on the lambda- 1se or lambda-min criterion and between continuous and binary outcomes. For this, the models were evaluated on nine benchmark datasets using repeated 10-fold cross-validation. The results show that all lasso variations improve model sparsity significantly while maintaining high accuracy, but at the cost of stability. The relaxed and adaptive lasso select sparser models than the standard lasso while achieving good stability of variable selection, but at the cost of less stable predictions. The relaxed adaptive lasso yields the sparsest model, but is the most unstable. Regarding lambda criterion, for continuous outcomes the lambda-minimum criterion leads to highly unstable results and diminishes the effect of lasso approach used. For binary outcomes, the lambda-1se criterion only improves accuracy and sparsity, but not stability, while for continuous outcomes it improves all performance diagnostics.Show less
Százhalombatta-Földvár is one of the biggest and most extensively studied Bronze Age tell sites in Hungary. Due to its location on a dry loessy high bluff zone on the Western bank of the river...Show moreSzázhalombatta-Földvár is one of the biggest and most extensively studied Bronze Age tell sites in Hungary. Due to its location on a dry loessy high bluff zone on the Western bank of the river Danube, a sedimentary environment that is appropriate for pollen preservation to conduct pollen analysis was not found around the site (Sumegi & Bodor, 2000). Instead, regional pollen analysis has been conducted to study the environment relating to the Százhalombatta-Földvár site. This regional sediment sample was obtained by coring from an oxbow lake about 500 m away from the site. During the Százhalombatta-Földvár excavation in 2022, however, the lithological examination of the floor sediment from [House] 9000 indicated the possibility for pollen preservation, followed by palynological investigation including the comparison to the regional pollen record. This unconventional method of pollen analysis was successfully conducted, yielding a well-preserved pollen assemblage. The methods of pollen analysis applied are pollen counts, taxonomic identification and states of preservation analysis. These methods indicate that the well-preserved pollen assemblage obtained from the unconventional context does not reflect the pollen assemblage from the oxbow lake pollen record. Especially the absence of arboreal pollen at the site compared to that recorded in the regional pollen data is conspicuous. These results allow us to discuss and investigate the sample from [House] 9000. Specifically, in the sample, taphonomic agents contributing to the absence of arboreal pollen in contrast with the regional palynological signal are analysed and the predominance of Poaceae is explained with taphonomic processes. Furthermore, the taphonomic agents causing the primary pollen preservation states are investigated and the taphonomic processes resulting in the preservation biases are explored in archaeological interpretation. In consequence, the investigation of the taphonomic processes suggests anthropogenic agents causing the discrepancy and bias in the pollen assemblage with the construction and materials used for [House] 9000. The pollen preservation state analysis revealed that the primary states of pollen preservation are degraded and folded. These in turn are evidence of the taphonomic processes of oxidisation and physical stress, which in combination with archaeological evidence suggests anthropogenic activities as cause. To conclude, this thesis could contribute to multi-disciplinary research and greater understanding of the Bronze Age site, Százhalombatta-Földvár. Moreover, it demonstrates new potential of palynological analysis employing an innovative sampling method that directly relates to the human activities at the site. The results of this thesis have the potential to stimulate further application of this new approach.Show less
In scientific research, interpretability and high predictive performance are difficult to combine: while black-box models perform better than interpretable models, only the latter allow for...Show moreIn scientific research, interpretability and high predictive performance are difficult to combine: while black-box models perform better than interpretable models, only the latter allow for transparency and inference, which are necessary tools when these models are used in decision-making or in hypothesis testing. Models such as RuleFit combine the flexibility of a black-box tree ensemble with the interpretability of a sparse, LASSO linear regression. Later work substitutes Bayesian regression for the LASSO regression, thus further improving the model’s prediction (Horserule). The work in this thesis was two-sided: on the one hand, we applied a different Bayesian prior (the informative Horseshoe prior) to the linear step of the RuleFit model, which can naturally take the structure of RuleFit into account. On the other hand, we used Shapley values to measure the contribution of each predictor in the RuleFit model and combined these values with the Bayesian regression to build inferential tools. The new machinery was tested on both synthetic data and the dataset from the Helius study. The predictive performance of the resulting model was observed to be higher than that of the original RuleFit model, but lower than that of Horserule. Compared to Horserule, the proposed model excessively favours trees over linearity, but in doing so it more strongly enforces the choice of simpler trees. Shapley values were also compared to other importance measures mentioned in the RuleFit literature, and shown to be more accurate in reconstructing the contributions as defined in the synthetic datasets.Show less
This thesis examines a new way of tracing individual life histories in the context of slavery in the Caribbean during the colonial period. The carbon stable isotopes in bioapatite were compared to...Show moreThis thesis examines a new way of tracing individual life histories in the context of slavery in the Caribbean during the colonial period. The carbon stable isotopes in bioapatite were compared to carbon and nitrogen stable isotopes in collagen of serial dentine samples in the case study of an enslaved African found on the island of Saba. Five dental elements were found out of anatomical context in a lockbox at Spring Bay Flat plantation. The use of bioapatite and collagen in tandem has been proved to provide extra valuable information in dietary studies and doing so in dentine increments yields an individual and high temporal resolution new to bioarchaeology. The individual studied here forcibly migrated from the African Sahel during the formation of the first molar, suffering from a period of nutritional stress before experiencing a dramatic dietary change. Multi-isotope analysis of both organic and inorganic matrixes in dentine increments is proven to be a valuable and innovative method of reconstructing individual life histories in unprecedented detail. The production of osteobiographies such as this one helps us to understand individual experiences during periods of slavery, captivity, and exploitation on a level that we can empathise with and therefore offers important and profound contributions to discussions on slavery and colonialism in a broader sense.Show less
The origin of speech is one of the biggest unanswered questions in the evolution of mankind. Scientist from all over the world from different disciplines using different methodologies have been...Show moreThe origin of speech is one of the biggest unanswered questions in the evolution of mankind. Scientist from all over the world from different disciplines using different methodologies have been trying to solve the mystery that is the origin of speech. An unambiguous answer however, remains absent. Using the method of comparative morphology and microbiomechanical studies, it can be studied when in our evolutionary history the anatomy fit to support speech production first arose, and thus which species first had the ability to talk. This thesis looks at published data on different hard structures of the vocal tract, in particular the hyoid, hard palate and mandible, of Australopithecus afarensis, Homo erectus, the SH hominins and Homo neanderthalensis to compare them to those of the modern human and non-human great apes vocal tract, in order to discover what we can infer about the origin speech based on the evolution of the vocal tract. This comparison has shown that based on their features, these hominins can be divided into two categories. The first category is that of archaic morphology and is characterized by a hyoid, hard palate and mandible that most closely resembles the anatomical features of the non-human great apes, in particular, chimpanzees. This means they possessed a bullashaped hyoid body, a long and broad hard palate and a long and narrow, chinless mandible. To this group belong the Australopithecus afarensis and Homo erectus. The second category is that of modern morphology and is characterized by the hyoid, hard palate and mandible that most closely resembles the anatomical features of modern humans. This means a bar-like hyoid body, a shorter and more narrow hard palate and a short and broad mandible with a bony protuberance, the chin. To this groups belongs the SH hominins the Homo neanderthalensis. Based on the results, it can be concluded that the anatomical features of the vocal tract fit to support the production of speech were already in place with, at least, Neanderthals. Therefore, Neanderthals could speak. The way forward for future studies into the origin of speech mainly is more data, both in terms of quantity and more species, though this is not something that can be forced. Establishing the origin of speech might open up a new path into studying the origin of language, a related, but not identical topic.Show less
Research master thesis | Archaeology (research) (MA/MSc)
under embargo until 2024-10-19
2024-10-19T00:00:00Z
During the early modern period (1500-1800 CE), Europe was plagued by syphilis, a venereal infection caused by the bacteria Treponema pallidum, resulting in chronic and debilitating symptoms....Show moreDuring the early modern period (1500-1800 CE), Europe was plagued by syphilis, a venereal infection caused by the bacteria Treponema pallidum, resulting in chronic and debilitating symptoms. Desperate to resolve the infection, patients were often subjected to prolonged and extensive treatments with toxic mercury. Unfortunately, osteoarchaeological study of syphilis is challenging due to the limited skeletal visibility of the infection. Moreover, historical evidence is sparse and often influenced by sociocultural stigma attributed to the venereal nature of the disease. This scarcity of data on syphilis in the early modern period has limited more holistic research into the disease and its treatment. Therefore, this study adopted a multidisciplinary approach to investigate syphilis and its treatment at St. Gertrude’s infirmary (1382 - ca. 1611) in Kampen, the Netherlands, where presence of the disease has been previously reported. Human skeletal remains (n=79) were re-examined with a focus on treponemal disease, following the scoring system laid out by Harper et al. (2011). The potential therapeutical use of mercury was investigated by conducting archival research and multiple trace elemental analyses. Using portable X-Ray Fluorescence Spectrometry (pXRF) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), subsamples of the skeletal assemblage were assessed on the presence of mercury in human bone. Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM-EDX) was conducted to assess the potential uptake of mercury in dental calculus on the teeth. Osteoarchaeological study identified several diagnostic cases of treponemal infection at the site (n=5 or 6.33%), as well as a number of cases with lesions suggestive of treponemal disease. This finding demonstrates the influence of treponemal disease, likely attributable to venereal syphilis, at St. Gertrude’s infirmary in Kampen, especially when compared to the prevalence of the disease in human skeletal assemblages from similar Dutch sites. Research into historical archives indicated that mercury was indeed used therapeutically in Kampen during the 18th century. However, it showed no direct evidence for syphilis or mercury treatment at St. Gertrude’s infirmary in the period of interest (1382 – ca. 1611). Unfortunately, elemental analyses revealed no substantial evidence for significantly elevated mercury concentrations, although interesting trends were found. In particular, both pXRF and SEM-EDX analyses did not result in absolute and quantifiable mercury concentrations. While ICP-MS analysis showed absolute concentrations of mercury in a subsample of bone material, interpreting and contextualising these results remains challenging. These observations may be explained by a lack of available mercury treatment in Kampen or a preference for other treatment methods. Nonetheless, this study helps to understand syphilis and its treatment in the early modern Netherlands and provides an evaluation of chemical analyses to detect mercury in archaeological bone.Show less
In onderhavig scriptieonderzoek wordt met een kritische blik gekeken naar de toegepaste prospectietechnieken en interpretaties van het drietal prospectieve onderzoeken in Geertjesgolf te Winssen,...Show moreIn onderhavig scriptieonderzoek wordt met een kritische blik gekeken naar de toegepaste prospectietechnieken en interpretaties van het drietal prospectieve onderzoeken in Geertjesgolf te Winssen, Moordhuizen en Angeren. Allen gelegen in het Gelderse deel van het Nederlandse rivierengebied. Tenslotte worden aanbevelingen gedaan voor toekomstige prospectieve onderzoeken binnen het rivierengebied. Aanleiding voor het onderzoek zijn de acties en gevolgen die hebben plaatsgevonden op de locaties Geertjesgolf te Winssen, Moordhuizen en Angeren, waarbij een archeologisch rijk landschap werd aangetroffen nadat de gebieden waren vrijgegeven. Ondanks dat grote delen van Geertjesgolf na deze vrijgave zijn weggegraven kon een groot gedeelte van het archeologische bodemarchief ex situ worden behouden. In het geval van Moordhuizen is zeer veel en met name bijzonder vondstmateriaal tijdens baggerwerkzaamheden verzameld. Echter is de context van het materiaal niet meer te achterhalen. Het onderzoek in Angeren daarentegen kent geen verloren archeologie. Nieuwe verwachtingsmodellen en bijbehorende prospectietechnieken tonen een haast feilloos systeem, waarmee archeologisch vindplaatsen op meerdere landschappelijk niveaus kunnen worden opgespoord. Tijdens het onderzoek veelvuldig gebruik gemaakt van literatuuronderzoek. Hierbij zijn met name (oudere) rapporten met betrekking tot het drietal onderzoeksgebieden geraadpleegd. Daarnaast is zowel analoog als digitaal kaartmateriaal bestudeerd. Het geraadpleegde kaartmateriaal had betrekking op archeologische- en landschappelijke verwachtingskaarten van de individuele onderzoeksgebieden als het Gelderse deel van het Nederlandse rivierengebied. Ten slotte heeft eigen opgedane ervaring tijdens archeologische onderzoeken in het rivierengebied als zeer belangrijke factor meegespeeld tijdens het onderzoek naar deze drietal prospectieve onderzoeken. De resultaten van onderhavig onderzoek laten zien dat relatief eenvoudige oorzaken hebben geleid tot het vrijgeven van twee van de drie onderzoeksgebieden. Een van de belangrijkste hoofdoorzaken is wellicht de misinterpretatie van komgebieden en hun onderliggende landschappen. Al vanaf de aanleg van de Betuweroute in 1995 ging men er van uit dat zij onaantrekkelijk waren voor menselijke activiteiten. Naar aanleiding van deze aanname vond in gebieden met een dergelijke bodemopbouw slechts in geringe mate archeologisch onderzoek plaats. Wanneer vervolgonderzoek wel plaats vond boorde men doorgaans slechts tot 2 a (maximaal) 3 meter, - Mv, waardoor de onderliggende landschappen vrijwel niet tot nauwelijks werden geïnterpreteerd. Daarnaast zorgde een natuurlijke factor voor verkeerde interpretaties van het landschap, namelijk de seizoenen. Doordat de rivieren in herfst en winter een relatief grote waterafvoer kennen, hadden de Maas uiterwaarden te maken met gemiddeld hoge grondwaterstanden. Als gevolg kon het opgeboorde boormonster niet tot nauwelijks worden opgehaald en beschreven. Tijdens latere onderzoeken in 2011 en 2017 werd de verkeerde interpretatie van het landschap bij Moordhuizen door middel van profieldocumentaties weer corrigeert, maar dit was immers al te laat. Groten delen waren in de jaren ervoor afgegraven en opgebaggerd. Zo ook waarschijnlijk de rijkste archeologische vindplaats van Nederland. Ondanks het grootte archeologische verlies in Geertjesgolf en Moordhuizen is een positieve leercurve op het gebied van prospectietechnieken te zien het archeologische werkveld. De landschappelijke kennis is in dermate toegenomen, waardoor archeologische vindplaatsen onder de komgebieden in groten getale tevoorschijn komen, zoals in het tracé van de verlengde Via15. Hieraan ten grondslag ligt het principediagram. Voortaan worden ingezette prospectietechnieken niet meer afgestemd op de nieuwste technieken en innovaties, maar op het type en aard van de verwachtte vindplaatsen in relatie met het landschap. Op basis van de verkregen resultaten van onderhavig onderzoek zijn aanbevelingen gegeven voor prospectief onderzoek in het rivierengebied. Eén van de hoofduitgangspunten is dat het principediagram standaard dient te worden gehandhaafd en te allen tijde dient te worden ingezet bij prospectief onderzoek in het rivierengebied. Daarnaast dient in uiterwaard- en kronkelwaarlandschappen de bodemopbouw enkel nog in kaart te worden gebracht doormiddel van profielkolommen of lengteprofielen, met een voorkeur in drogere seizoenen met een gemiddeld lage grondwaterstand. Ten slotte dienen er meer specifiek gerichte vraagstelling met betrekking het complexe rivierengebied worden opgesteld, zodat onterechte vrijgave van toekomstige onderzoeksgebieden voorkomen kan worden.Show less
Research master thesis | Archaeology (research) (MA/MSc)
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Lithics are often one of the few materials from the Paleolithic that withstood the passage of time. Archeologists rely on them when they try to understand what happened in the past. Over the past...Show moreLithics are often one of the few materials from the Paleolithic that withstood the passage of time. Archeologists rely on them when they try to understand what happened in the past. Over the past centuries, lithic research has changed and in the last decennia the use of Machine Learning and 3D geometric morphometric (3DGM) analysis has been explored. In 2021, Archer et al. published a paper in which they explored the possibility of 3DGM analysis. With the help of Machine Learning, their model was trained with an experimental reference collection consisting of Levallois, discoidal and laminar debitage. As a result, the model could classify the technology of 73 – 77 % of the remaining experimental collection correctly. With a traditional analysis, around 20 – 30 % of the flake assemblage is identified. This would indicate that a much larger percentage of the assemblage could be classified with 3DGM analysis. However, this had never been tested on an archeological collection. In this thesis, the late Middle Paleolithic lithics of sublayers EGB and EGC of Quinçay are studied with a focus on flaking technologies. This is done through a traditional analysis consisting of an attribute analysis and a chaîne opératoire analysis and a 3DGM analysis. This is important for two main reasons: 1. Since 3DGM analysis of flaking technologies has never been applied on an archeological collection before, this research might provide valuable insights on how 3DGM analysis can be useful for understanding flaking technologies of archeological lithic collections, 2. The sublayers EGB and EGC of Quinçay have never been studied in detail before, and might provide more insights into the nature of the archeological sequence at Quinçay. Interestingly, the results of the traditional analysis and the 3DGM analysis revealed quite some differences. In the traditional analysis, discoid seemed to be the most common reduction method in the assemblage, this was followed by laminar reduction. However, in the 3DGM analysis, most of the flakes were classified as Levallois flakes. The model seemed to have the most difficulties with recognizing discoid products. The reason for the differences in classification between the traditional analysis and 3DGM analysis, could possibly be result of how the experimental collection was set up and the model was trained. In this thesis, multiple suggestions are proposed that could potentially help with improving the model in such a way that it could be more beneficial when using it on an archeological collection. The advantages and disadvantages that come with 3DGM analysis are also touched upon. By incorporating this innovative approach when studying the late Middle Paleolithic lithics from Quinçay, it is explored how 3DGM analysis can potentially help researchers with the analysis of lithics. As Machine Learning and Artificial Intelligence become more intensively used in the future, it is not unlikely that it will start to play an important role in lithic analysis as well.Show less
Biological kinship is a phenomenon inherent in all people. Therefore, it is no wonder that it is an often-researched topic in bioarchaeology. Even though a living person could speak about their kin...Show moreBiological kinship is a phenomenon inherent in all people. Therefore, it is no wonder that it is an often-researched topic in bioarchaeology. Even though a living person could speak about their kin, the bones of people long passed have another way of saying who their relatives are. The approach used in this research examines cranial non-metric traits, the morphological variants appearing on the skull. This study investigated the relationship between biological kinship and cranial non-metric traits in the Middenbemster skeletal collection. Examining these traits aimed to gain further insight into familial connections within the cemetery, adding to previous studies that only focused on dental non-metric traits and foot anomalies. To estimate the familial relationships in the Middenbeemster skeletal collection, the data on 27 cranial non-metric traits were collected in 213 adult individuals. The traits were visually scored as present, absent, or unobservable if skeletal material was missing or poorly preserved. After collection, data were statistically analyzed. Analysis of traits revealed that most traits were represented in the sample and that there is inconsistency in the sex dependence of the traits. The principal finding of this research was the identification of precondylar tubercle as a basis for further hypothesizing about kinship, as it appeared in a significantly higher frequency in the Middenbester sample compared to the reference sample. This finding was further used to form a hypothetical kinship group, which may further be used to explore kinship through the archival data. Moreover, this research adds to the previous research conducted on this topic in Middenbeemster and provides a fresh perspective.Show less
Locally produced incised impasto ware is known to dominate the necropoleis and settlement contexts of Falerii Veteres, modern Civita Castellana, northern Lazio, during the Orientalizing period (8th...Show moreLocally produced incised impasto ware is known to dominate the necropoleis and settlement contexts of Falerii Veteres, modern Civita Castellana, northern Lazio, during the Orientalizing period (8th – 7th centuries). Falerii Veteres is recognized as the main town of a small peripheral region, acting as a middle ground between the Sabine, Capenate, Latin and Etruscan regions. Within this well connected ancient cultural landscape the Faliscan incised impasto production remains crucially its own, adopting the decorative repertoire of the Orientalizing and bucchero wares as the artisans or consumers saw fit. The research of this thesis revolves around the main question “How did potters’ technological choices develop at Falerii during the Orientalizing period (8th – 7th centuries BCE) when it comes to the traditionally produced incised impasto ware?”. Using techniques and methodologies developed by the Archaeological Sciences, pXRF analysis was performed on an assemblage of incised impastos (n = 45). The results confirmed suspected imported vessels, proving its validity, and offered surprising results, showing two different artisanal recipes were used, either contemporaneously or possibly throughout time. These results have offered a first look into the chemical composition of the incised impasto wares and the decorative pastes which filled their incisions from the city of Falerii Veteres and its necropoleis. The results offer high potential for the study of change throughout time of raw material usage and potential provenancing of locally produced impasto for the entire region of the Ager Faliscus and beyond.Show less
The topic of discussion in this thesis is the pre- and post-settlement environment of eastern Iceland, human exploitation of it and its consequences. Materials used are pre-existing publications on...Show moreThe topic of discussion in this thesis is the pre- and post-settlement environment of eastern Iceland, human exploitation of it and its consequences. Materials used are pre-existing publications on macro- and micro-botanical remains retrieved from both archaeological and natural contexts in eastern Iceland along with new archaeobotanical data from the archaeological site of Fjörður, Seyðisfjörður. The aim is to get a comprehensive image of the environment and vegetation in the area and to estimate the scope of human exploitation of it, with special emphasis on domestic use, livestock and cultivation. The results show that most of the sites seem to have been unforested prior to the settlement and characterised by heathland and grassland. Due to this fact the environmental effect of human arrival in the area was not as dramatic as in other more forested parts of the country. The most common influence of the settlement was replacement of taxa that are preferred by grazers by more grazing tolerant taxa and an introduction of anthropogenic indicators. A decrease in woodland was also observed where relevant, as well as increased soil erosion. Evidence of grazing was detected in almost all of the sites, along with anthropogenic fertilization and heathland expansion and exploitation. Insects and fungi reliant on domestic animals were also present in some of the sites. Driftwood seems to have been the most common wood used for construction and local wood most common as fuel. Peat and animal dung were also used as fuel which suggests a versatile fuel utilisation strategy. Cereal pollen was only found at three sites and a barley seed found in Fjörður seems to be the first cereal macrofossil found in an archaeological context in eastern Iceland. Cereal seeds have been found in many archaeological sites in other parts of the island and cultivation suggested for some of them. A possible explanation for the lack of evidence of arable agriculture in eastern Iceland is the lack of archaeological, environmental and archaeobotanical research in this part of the country, especially in environments suitable for cereal cultivation.Show less
In order to reconstruct the vegetation of the Vrouw Vennepolder during the Late Pleistocene and Early Holocene pollen samples were studied under a microscope and the information was then turned in...Show moreIn order to reconstruct the vegetation of the Vrouw Vennepolder during the Late Pleistocene and Early Holocene pollen samples were studied under a microscope and the information was then turned in to pollen diagrams. These pollen diagrams showed two distinct local pollen assemblage zones (LPAZ) throughout the sequence. LPAZ VVP-1 showed a Pinus dominated coniferous forest with high amounts of Corylus that was slowly transitioning into a mixed deciduous forest. The steppe landscape was slowly disappearing and the Rhine or one of its tributaries and possibly a lake were likely nearby. LPAZ VVP-2 showed a now Corylus dominated mixed deciduous forest and the likely complete disappearance of the steppe. Alnus marshes now also played a dominant role. The river was likely still nearby. These results provide a more detailed picture of the vegetation of the Vrouw Vennepolder. In order to add a more precise timescale to the sampled sequence the sediments and the biostratigraphy were compared to the geological events and biostratigraphy of the western Netherlands during the Late Pleistocene and Early Holocene. This revealed that the sequence started with LPAZ VVP-1 in the Late Pleistocene during the Younger Dryas and possibly continued in to the transition to the Holocene Preboreal. After a hiatus in the Preboreal the sequence continued with LPAZ VVP-2 in the Boreal period which probably ended at the transition to the Atlantic period. The depths of the sediments were also correlated to the sea-level curve of the Rhine-Meuse delta in order to provide further dating information. This method suggested a much younger and shorter sequence in the Atlantic, but given the difficulties of this method it is better to rely on the information provided by the sediments and the biostratigraphy. These results provide a more detailed timescale for the sampled sequence. In order to determine the possibility of Paleolithic and Mesolithic groups visiting the Vrouw Vennepolder the Vrouw Vennepolder was analyzed in regards to the resources and the ecological challenges it could provide. The tough ecological challenges it provides in the vicinity of the corings due to wetness mean that it is unlikely that humans built settlements right there. They could have built them elsewhere in the Vrouw Vennepolder or outside of it and then used the area for hunting and foraging. The Vrouw Vennepolder would however have provided a large amount of resources, Corylus nuts in particular, meaning that nearby humans are likely to have exploited the area. The early and dominant presence of Corylus in the pollen diagrams could be the result of humans interacting with the environment through burning, but it is far from definitive. These results do not provide evidence for human occupation or exploitation of the Vrouw Vennepolder, but exploitation at least seems very likely.Show less
This thesis analysed the construction dates of early medieval forts in the Dutch Low Countries to determine their accuracy. The ringforts are generally dated to the last quarter of the 9th century...Show moreThis thesis analysed the construction dates of early medieval forts in the Dutch Low Countries to determine their accuracy. The ringforts are generally dated to the last quarter of the 9th century and placed in an overarching historical narrative that links them to Viking raids. However, recent archaeological research suggests that earlier dates are also possible. For example, the ringfort of Den Burg was recently dated to the 8th or early 9th century with the upcoming OSL (optically stimulated luminescence) method. I selected the forts of Den Burg, Oost-Souburg, Burgh, Domburg, Deventer, and Zutphen and analysed the construction dates based on excavation reports and subsequent data analysis. I also looked at the general characteristics of the forts like shape and the type of inhabitation to determine their similarity. I found that most of the forts, except for Deventer and Domburg, could be older than the late 9th century because they were dated with a terminus ante quem or the methods used indicated a broad construction date. This is because the construction phase of a ringfort is hard to date for 14C- analysis and dendrochronology are almost never possible. This highlights the importance of OSL research in the research of ringforts. I also found that ringforts in the Dutch Low Countries differ in general characteristics. Both findings challenge the narrative of a structured defence system against Viking raids, and show that ringforts have often been interpreted based on assumptions from the historical narrative. Instead, this thesis suggests that the structures were erected at different times, by different actors, and probably for different reasons. Thus, future archaeological research should apply OSL as a dating method and be wary of assumptions from the historical narrative. This way, we can establish accurate construction dates and get closer to uncovering the complex nature of these early medieval fortifications.Show less
Research master thesis | Archaeology (research) (MA/MSc)
under embargo until 2024-08-31
2024-08-31T00:00:00Z
Stable carbon (δ13C), nitrogen (δ15N), and oxygen (δ18O) isotopes are well-established proxies for the reconstruction of past diet and environment. δ13C and δ18O can be used to reconstruct the...Show moreStable carbon (δ13C), nitrogen (δ15N), and oxygen (δ18O) isotopes are well-established proxies for the reconstruction of past diet and environment. δ13C and δ18O can be used to reconstruct the plant-based diets of animals and seasonal environmental patterns. These isotopes are regularly measured in the non-organic component of tooth enamel, which is highly resistant to diagenetic alteration. Likewise, δ15N can be used to reconstruct trophic level and food webs. Up until recently, δ15N could only be measured on relatively young samples (<100,000 years old), because it requires organic material, usually bone collagen or dentin, which rarely preserves in the fossil record. However, in 2021, an oxidation-denitrification method was developed. This method allows for the measurement of the nitrogen isotopic composition of the organic material trapped in the crystalline structure of (fossil) tooth enamel. Thus, we can now measure δ13C, δ15N, and δ18O on the same aliquot of tooth enamel. Here, combined δ13C, δ15N, and δ18O isotope data from tooth enamel of 14 serially-sampled fossil equid (Equus sp.) third molars from the ~120,000-year-old Middle Paleolithic Neanderthal site of Neumark-Nord 2, Germany, is presented. Each tooth was sampled along the growth axis and yielded up to 26 sub-samples (total n = 259). Neumark-Nord is a well-preserved archaeological site with a rich vertebrate fauna. It has yielded a large isotopic dataset, which includes some of the oldest stable carbon and nitrogen isotope measurements on bone collagen. This study allows us to expand the isotopic dataset of Neumark-Nord 2 by serially-sampled data, which enables us to reconstruct seasonality for the Last Interglacial (Eemian; MIS 5e/5d transition). δ13C and δ18O of all enamel samples (n = 259) was measured using the cold trap method. Based on these isotope patterns, 72 samples (including all serial measurements of three of the equid teeth) were selected for δ15N measurement, to assess potential seasonal variation in the δ15N values of the enamel. The enamel δ13C, δ15N, and δ18O results are consistent with previously published equid collagen δ13C, δ15N, and bulk enamel δ18O values. A clear seasonal signal is present in the δ18O values of each tooth, with higher values in summer than in winter. This seasonal signal is absent in both the δ13C and δ15N values. This study shows that there is no strong effect of seasonal variation detectable in the δ15N values of nitrogen isotopes in the enamel of equids in temperate environments. This suggests that, in order to measure an accurate average δ15N value, bulk samples of tooth enamel from equids – and likely other large herbivores – in temperature environments do not need to cover an entire year of growth. In addition, the correlation observed between δ13C and δ15N enamel values seems to indicate that, in such environments, the mechanisms controlling carbon and nitrogen isotope fractionation are positively related. Lastly, this study improves the time-resolution of the Neumark-Nord 2 isotopic dataset, allowing for a better reconstruction of the past ecosystem by providing seasonal data.Show less
Drawing on research findings of a fish event horizon in England and extensive work on historical fish consumption in Belgium, this study aims to answer the question: How did fish consumption...Show moreDrawing on research findings of a fish event horizon in England and extensive work on historical fish consumption in Belgium, this study aims to answer the question: How did fish consumption develop in the northern Low Countries during the early and late medieval period (450-1500). This research is conducted using the Dutch Fish Bones (DFB) dataset, which includes the Number of Identified Specimens (NISP) of fish species and families from archaeological sites between 0-2000 CE. The DFB-dataset is subjected to aoristic analysis in 25-year bin categories to create a diachronic timeline. Despite potential biases and limitations, coherent with the presence of uncertainty within each assemblage and the underrepresentation of certain fish species due to differential preservation and the collection methods employed in archaeological excavations, the study offers valuable insights into regional fish consumption dynamics. During the period from 450 to 650, both inland and coastal regions displayed a preference for locally sourced fish. Freshwater eels, cyprinids, and perches were the primary choices inland, while coastal consumption mainly consisted of demersal righteye flounders and small amounts of herring. From 650 to 950, the coastal region continued to heavily rely on righteye flounders, while freshwater fish remained popular inland. However, there was a gradual emergence of marine fish consumption during the "long eighth century," likely influenced by trade and commercial hubs. Between 950 and 1200, the consumption of marine, migratory, and freshwater fish declined in the northern Low Countries, potentially due to the Medieval Warm Period and changes in fish populations. Despite this decline, there was a slight increase in codfish consumption, which may be linked to the growing trade of Norwegian stockfish. Urban areas witnessed a shift towards marine consumption between 1200 and 1375 in a period that can be called a gradual ‘fish event horizon’, rural areas, in contrast, exhibited a delayed increase in marine fish consumption almost a century after urban consumption surged. The development of markets and trade hubs played a crucial role in making marine fish more accessible in inland regions. The rapid growth in smelt consumption during the fourteenth century reflects the broader trend of rising fish consumption, fuelled by urbanization, population growth, and dietary restrictions. The formation of the Zuyderzee facilitated trade of the Hanseatic cities by providing an open waterway to the North Sea. However, human interventions disrupted the distribution of fish species, leading to a decline in freshwater eels. During the late fourteenth to seventeenth centuries, fish consumption experienced significant expansion phases. Herring, cod, and righteye flounders were consumed in larger quantities, driven by technological advancements in fishing techniques and equipment. The herring industry of the northern Low Countries grew rapidly, with Dutch vessels dominating European trade. Between 1650 and 1800, overall fish consumption declined due to conflicts, economic difficulties, and political instability. However, throughout the centuries following the fish event horizon, the pattern of high marine fish consumption has remained steadfast and continues to be relevant in modern times. These findings illuminate historical fish consumption patterns in the region and provide a foundation for future research, including enriching the dataset, calling for additional meta-analyses and isotopic research, and addressing knowledge gaps, such as the significant decrease in overall fish consumption in the period 950-1200.Show less