A multidisciplinary approach to reconstructing Late Glacial and Early Holocene landscapes (original) (raw)
Related papers
Archaeological Prospection, 2016
During extensive construction works in Antwerp harbour, well preserved Late Glacial dune formations were discovered buried deeply below the Scheldt polders and covered by peat, organic matter (OM) rich clays and marine clayey to sandy sediments. First, coring based archaeological prospection strategies for evaluating prehistoric occupation levels in wetland landscapes are reviewed. Next, a more effective approach including near surface geophysical and geotechnical techniques is proposed and tested in Doelpolder Noord. The results indicate that high resolution electromagnetic induction survey at multiple coil spacing provides a suitable approximation of the prehistoric landscape variability but is challenged by variations in groundwater brackishness. Gridded cone penetration tests provide a solution in such cases and serve as an excellent interpretation tool for the conductivity data in general. Due to the required effort, electrical resistance imaging and shear wave land seismics were judged inefficient. Finally, a small dune with indications of paleosol conservation and estimated suitability for Final Palaeolithic to Early Neolithic occupation is sampled by Dutch hand augering and Sonic Drill Aqualock coring. Archaeological indicators for prehistoric occupation such as burnt bone and flint fragments were retrieved from these samples after sieving.
Geoarchaeology, 2016
Well-preserved prehistoric landscapes and sites have been found, buried deeply below the Holocene peat or floodplain deposits of "Waasland Scheldt polders." During the mid-to-late Holocene, Late Weichselian (river) dunes within the floodplain and river flanks were favored locations for Final Early Neolithic occupation. Available living space was determined by the dune topography and elevation of the peat at that time. Therefore, an elevation model of the peat base was created using multireceiver electromagnetic induction (EMI) survey data. Electrical conductivity data of a dune were collected and 1D inverted within a three-layered soil model with variable electrical conductivity of the top layer and variable depth to the base of the middle layer (i.e., the peat). The modeled peat base depth was calibrated and validated, and eventually replaced by depth data from coring and cone penetration measurements wherever depth modeling from inverting the EMI measurements proved inaccurate. Using the resulting peat base elevation model, a paleogeographic map at the time of the modeled end date of Mesolithic-Neolithic transitional Swifterbant Culture sites nearby was created by chronologically modeling the peat elevation at that time. The developed paleogeographic mapping methodology can be used for subsequent archaeological prospection by core sampling or to contextualize excavated sites.
2015
Since the last decades, well preserved Late Glacial dune formations containing numerous prehistoric sites buried deeply below peat, OM rich clays and marine clayey to sandy sediments have been discovered during extensive construction works in the harbor of Antwerp situated in the lower Scheldt river basin in northwest Belgium. Archaeological excavations have identified the first presence of the transitional Mesolithic-Neolithic Swifterbant culture, previously only known from sites in the Netherlands and one site in northwest Germany, and evidence for the presence of other Final Paleolithic to Early Neolithic cultural remains. High quality organic preservation at these sites have offered the opportunity to reliably place Swifterbant occupation within the absolute chronology of the Mesolithic-Neolithic transition in this region, as well as the reconstruction of Swifterbant subsistence practices, most notably the incorporation of cattle husbandry into a traditional hunting-fishing-gath...
Quaternary International, 2013
This paper presents new geo-archaeological perspectives on the Late Glacial and Early Holocene human occupation around a large palaeolake, the Moervaart palaeolake (w25 km 2 ). Intensive fieldwork, using invasive and non-invasive survey techniques, combined with modelling of the palaeotopography and palaeogroundwater and multi-proxy palaeoecological analyses have resulted in a detailed reconstruction of the landscape during the Final Palaeolithic and Early Mesolithic occupation of the area. A major shift in the occupation from the Federmesser Culture to the Early Mesolithic was contemporaneous with a sudden and drastic change in the palaeohydrology of the area between ca. 13,300 and 13,000 cal BP (end of Allerød), which coincided with a short but abrupt cooling event known as the Intra Allerød Cold Period (IACP) GI 1b. It is assumed that this event triggered the sudden drying up of the Moervaart palaeolake and surrounding ponds, which until then had provided Federmesser hunter-gatherers with extensive and fertile grounds for hunting, gathering and drinking water. The population decline which followed this hydrological event was reinforced by the prevailing cold and harsh conditions of the Younger Dryas and probably lasted until the Pre-boreal. Hunter-gatherers returned to the area in the Boreal, now settling along the proximal floodplain regions of a meandering channel which was connected with the southern Scheldt River.
2013
This paper presents new geo-archaeological perspectives on the Late Glacial and Early Holocene human occupation around a large palaeolake, the Moervaart palaeolake (∼25 km²). Intensive fieldwork, using invasive and non-invasive survey techniques, combined with modelling of the palaeotopography and palaeogroundwater and multi-proxy palaeoecological analyses have resulted in a detailed reconstruction of the landscape during the Final Palaeolithic and Early Mesolithic occupation of the area. A major shift in the occupation from the Federmesser Culture to the Early Mesolithic was contemporaneous with a sudden and drastic change in the palaeohydrology of the area between ca. 13,300 and 13,000 cal BP (end of Allerød), which coincided with a short but abrupt cooling event known as the Intra Allerød Cold Period (IACP) GI 1b. It is assumed that this event triggered the sudden drying up of the Moervaart palaeolake and surrounding ponds, which until then had provided Federmesser hunter-gatherers with extensive and fertile grounds for hunting, gathering and drinking water. The population decline which followed this hydrological event was reinforced by the prevailing cold and harsh conditions of the Younger Dryas and probably lasted until the Pre-boreal. Hunter-gatherers returned to the area in the Boreal, now settling along the proximal floodplain regions of a meandering channel which was connected with the southern Scheldt River.
Quaternary International, 2014
Throughout the Quaternary, episodes of glaciation and associated low sea level have resulted in the connection of the terrestrial landmasses of Britain and mainland Europe. The river systems that established themselves across these newly emergent land surfaces of the coastal plain would have created important migration corridors for both animals and humans, a point corroborated by the affinity of Palaeolithic remains across Britain and Europe. Technological developments within the last decade have allowed these now submerged valley floors and adjacent terrestrial landscapes associated with the last cold stage and early and middle parts of the current (Holocene) interglacial to be explored and their archaeological legacies unravelled, providing geoarchaeologists with an opportunity to contribute to major cultural debates. However, in order to maximize knowledge, it is essential that geoarchaeologists working within river valleys across both Britain and the European continent are addressing similar research questions by collecting data using comparable methodologies. This paper reviews the approach taken in different regions and provides a baseline assessment to allow the development of a coherent European-wide framework for alluvial geoarchaeology and geoprospection, particularly with respect to the Holocene record.
Mapping buried Holocene landscapes. Past lowland environments, palaeoDEMs and preservation in GIS
In: R.C.G.M. Lauwerier, M.C. Eerden, B.J. Groenewoudt, M.A. Lascaris, E. Rensink, B.I. Smit, B.P. Speleers and J. van Doesburg (Eds.) 2017. Knowledge for Informed Choices. Tools for more effective and efficient selection of valuable archaeology in the Netherlands. Nederlandse Archeologische Rapporten 55. In a geological GIS-data recombination project, a digital map was produced that contains information on the Netherlands’ former coastal and delta plain landscapes over the last 14,000 years: the Holocene and the very end of the Pleistocene. The polygon map product is accompanied by a set of palaeoDEMs (Digital Elevation Models) indicating the attention depth for buried land surfaces and aquatic deposits for four time slices. This paper provides conceptual background information on the legend and construction principles behind the polygon maps and the palaeoDEMs, i.e. the decisions taken during the making of. It also provides a basic overview of the map product: landscape structure, burial depth and preservation, visualised for the four time slices in the RCE’s Archaeology Knowledge Kit. The text links coastal plain buried landscape mapping for four time slices to the other Knowledge Kit activities described in this volume, notably that of the Archaeological Landscapes map (for the most recent time slice in the coastal plain area of the Netherlands, and for all time slices in the Pleistocene uplands).
Middle Palaeolithic Land Use in Dutch and Belgian Limburg: Integrating Data from Surface Sites
The European Middle Palaeolithic archaeological database is rich, but is biased towards evidence that originates in stratified sites. In many river catchments, prevalent and often ignored evidence for Middle Palaeolithic occupation is found in palimpsest lithic assemblages on the surface. By way of a case study, this paper addresses the problem of how to integrate lithic artifact assemblage data from such contexts to complement an often unbalanced picture of long-term land use. Analysis of a sample of Middle Palaeolithic surface assemblages from southesouthwest facing edges of plateaus and terraces in Dutch and Belgian Limburg yields data suitable for comparison and integration with those from stratified assemblages associated with the wider Maas River valley floor. Sample size and artifact class diversity relationships account for sample size effects and numerically summarize patterns of inter-site fragmentation of core reduction sequences and differential artifact discard, arguably indicators of regional mobility and land use. Variability in artifact class diversity among assemblages also indicates differences in site occupational frequency. When viewed from a long-term diachronic perspective, integrated evidence from cumulative and spatial palimpsests suggests that land use behavior was complex, dynamic, and varied according to topographic factors in the research area. Lack of chronological resolution, variable site formation processes and conditions of artifact recovery complicate detailed interpretation of land use patterns. Despite these problems, results suggest that throughout the Middle Palaeolithic in the research area some plateau and terrace localities were 'persistent places' frequently re-occupied for a variety of purposes, while other similarly situated sites and localities more closely associated with river and stream valleys appear to have been occupied less frequently for a more limited range of activities.
2013
The complex debate on prehistoric settlement decisions is no longer tackled from a purely archaeological perspective but from a more landscape-oriented manner combined with archaeological evidence. Therefore, reconstruction of several components of the former landscape is needed. Here, we focus on the reconstruction of the groundwater table based on modeling. The depth of the phreatic aquifer influences, for example, soil formation processes and vegetation type. Furthermore, it directly influences settlement by the wetness of a site. Palaeogroundwater modeling of the phreatic aquifer was carried out to produce a series of full-coverage maps of the mean water table depth between 12.7 ka and the middle of the 20th century (1953) in Flanders, Belgium. The research focuses on the reconstruction of the input data and boundary conditions of the model and the model calibration. The model was calibrated for the 1924–1953 time period using drainage class maps. Archaeological site data and podzol occurrence data act as proxies for local drainage conditions over periods in the past. They also served as a control on the simulated phreatic palaeogroundwater levels. Model quality testing on an independent validation data set showed that the model predicts phreatic water table levels at the time of soil mapping well (mean error of 1.8 cm; root mean square error of 65.6 cm). Simulated hydrological conditions were in agreement with the occurrence of archaeological sites of Mesolithic to Roman age at 96% of the validation locations, and also with the occurrence of well-drained podzols at 97% of the validation locations.
2013
Several alluvial areas in the Lower Scheldt basin (LSB) have been subjected to geo-archaeological surveys and excavations in light of tidal restoration and nature development projects. Through the combination of a large number of radiocarbon dates and the sedimentary and geomorphological characteristics of the dated samples, several trends in the evolution of Lateglacial and Holocene fluvial activity in the LSB emerge. At the onset of the Lateglacial period the fluvial style in the LSB consisted of a meandering river system. During most of this period and the early and middle Holocene depositional processes dominated. After a first phase of gyttja deposition, organic and clastic sediments gradually filled the channels and later on this accretion also occurred outside their confines, extending laterally in the alluvial plain. The transition from the Subboreal to the Subatlantic period witnessed an intensification of fluvial activities, and a new meandering river system developed. Vertical accumulation processes continued to dominate the fluvial environment. Due to the creation of an extensive network of dikes floodplain evolution was restricted from the 11th–12th century onwards. Similar evolutions are observed in other lowland river basins in NW Europe, evolutions which have been related to climatic changes, and from the 4th millennium cal BP onwards, also to anthropogenic influences. The low-energy aggradation regime throughout the Holocene within the alluvial areas of the LSB accounts for an extensive, well-preserved, but well-hidden archaeological record. The observed geomorphological and sedimentary evolutions are of primary importance for the understanding of the presence and ‘preservation potential’ of archaeological structures and finds from the Final Palaeolithic up to the Medieval period.