Fuel, Fire and Heat: an experimental approach to highlight the potential of studying ash and char remains from archaeological contexts

As in traditional societies today ancient societies probably selected different fuels to meet specific heat requirements. Char and ash, the end products of fire, are often found in abundance in archaeological contexts. These end products can provide information regarding (i) the original fuel resource and type, (ii) the characteristics of the fire and (iii) combined with other archaeological evidence shed further light on possible socio-economic activity(-ies) associated with that fire. The three main fuel resources would have been (i) modern vegetation, (ii) fossil fuel and (iii) animal by-products. Local availability and abundance would have influenced the choice made.In this study an experimental approach was adopted to try and distinguish between the three different fuel resources that are known to have been used by ancient societies (and continue to be used by traditional societies today) from their char and ash remains to help determine original fuel-type and understand the relative heating properties. For this end one fuel-type from each fuel resource listed above, namely wood, peat and cow dung, was chosen.     

Combining New Awareness and Public Support for Archaeology with In Situ Preservation of an Archaeological Monument

Preserving archaeological remains in situ is one of the main objectives of the Valletta Treaty, which was signed by the Dutch government in 1992. Subsequently, preservation in situ has become one of the pillars of archaeological heritage management in the Netherlands. Another objective of the Treaty is the promotion of heritage education and raising of public awareness for the protection and investigation of archaeological heritage. Until recently, this goal has received too little attention. The design and building of an underground visitor centre, DOMunder, raised an important question: How can we transform an archaeological monument into an asset for the community and at the same time ensure long-lasting preservation? Not many parallels exist, as most archaeological sites in urban environments are seen as a burden for development. Sites are generally either excavated or left in situ; in both cases the archaeology remains invisible and inaccessible to the public. In the case of DOMunder, the location in a wet sedimentary environment provided even more challenges. This paper focuses on a few of the many questions and problems that were raised before and during the building process and the (preliminary) answers and solutions.     

To Have and to Hold? Recent Research on the State of Preservation of the Roman Fort of Fectio (Municipality of Bunnik), the Netherlands

The transformation of the Roman fort of Fectio was seized upon to gain insight into the factors that determine the degradation of metal finds and the relationship with different forms of land use. The research showed no difference in the preservation of metal finds from different burial contexts, including disturbed contexts. A possible explanation for the good condition of the metal finds is the presence of organic waste and building material that, together with the clayey soil, create an ideal burial environment for non-ferrous metals.     

Cover it! The Protection of a Merovingian Burial Ground in Borgharen (Municipality of Maastricht), the Netherlands

A Merovingian burial ground in Borgharen was threatened by development. Plans however could be changed so the site could be preserved. The initial research however showed the bone material was at risk of severe degradation in the near future. In order to determine whether in situ preservation was feasible three campaigns were carried out. This led to the conclusion that the burial conditions were excellent and there was little risk that severe degradation will reduce archaeological information of the site over the coming decades. The remaining threat concerned illegal excavators with metal detectors and spades. To protect the site it was covered with a series of different materials to prevent the site from being looted.     

Erosion and Errors: Testing the Use of Repeated LIDAR Analyses and Erosion Modelling for the Assessment and Prediction of Erosion of Archaeological Sites?

Slope soil erosion is one of the main threats to archaeological sites. Several methods were applied to establish the erosion rates at archaeological sites. Digital elevation models (DEMs) from three different dates were used. We compared the elevations from these three models to estimate erosion. We also applied the landscape evolution model LAPSUS with the available DEMs as basis. Spatial processing errors and effects of tillage and harvesting practices explain most of the DEM elevation differences between the recordings. Increased DEM resolution does not result in more precise or reliable erosion. The present technological level of landscape evolution modelling makes it possible to indicate areas most vulnerable to soil displacement by surface runoff erosion and tillage. Future research, using sediment and surface dating techniques such as deposit of radionuclides, heavy metals and OSL dating will provide a more accurate estimation of erosion rates and the subsequent impact on archaeological sites.     

Relax,Don’t Do It: A Future for Archaeological Monitoring

Preservation in situ and the monitoring of archaeological sites have become important themes since the acceptance and implementation of the Valletta Treaty. In the last few decades, our knowledge of degradation processes has increased manyfold, and a range of techniques have been tested and applied for use in both assessment and monitoring. Despite these successes, all is not well. First, we have little notion of the speed of the decay processes involved. This makes it difficult to distinguish between acute and protracted degradation. Apart from that, many assessments and subsequent monitoring projects rely (too?) heavily on complex and costly specialist technology. For any future preservation — in situ — projects low-tech observations together with best estimates of decay rates and archaeological site information should be combined to make an accurate assessment of the effects of decay on the archaeological record. Monitoring for preservation purposes is only appropriate if (1) decay processes occur within a relevant and measurable time scale, and (2) if mitigating actions can be taken or preservation ex situ can be performed (i.e. a rescue excavation) if significant degradation takes place.     

Wrap a Wreck! In Situ Conservation of a Ship on Land Suffering from Fungal Decay

Many sixteenth- to eighteenth-century shipwrecks have been found after land reclamation in parts of the former Zuiderzee, one of the busiest waterways in Dutch history. After the land fell dry, some shipwrecks were excavated, destroyed, reburied, or covered with sand or clay. In the late 1970s a method was developed to mitigate degradation processes of some of the wrecks remaining in good condition by wrapping them in plastic foil. The idea was that the plastic would prevent evaporation and lateral subsurface flow. Wet conditions prevent decomposing of wood by especially soft rot fungi. Oxygen will be rapidly depleted by decomposition of organic matter.

Recent monitoring of wrapped shipwrecks has shown that this method of preventing rot worked exceptionally well. We adapted wrapping using new technology nowadays applied for sealing tunnels and landfills. We will present the implementation requirements, materials and new adapted method for wrapping shipwrecks.     

Home as a Pocket of Local Order: Everyday Activities and The Friction of Distance

Discourse on the information society currently highlights issues of networks, flows and mobilities as prime organizers and re‐organisers of time—space relationships. Such discourse promotes notions of the flexible use of time and space, of people's decoupling from place and even of the end of geography — the belief that distance does not matter. Yet, in this article we argue that the roles of geographical stationarity and proximity in everyday life — understood as the creation and maintaining of pockets of local order — indicate the continuing and often neglected importance of the friction of distance. We demonstrate this empirically by focusing on the home as a pocket of local order, investigating the intensity and spatial extension of people's everyday activities, projects and contacts — their corporeal, virtual and medial (media‐related) mobilities — with the world outside. We support our thesis with data from the population, household and individual levels.