The In Situ Preservation in the Unsaturated Zone: Results from Environmental Investigations at the ‘Schultz Gate’ Case Study in the Medieval Town of Trondheim,Norway

Medieval Trondheim is located on the eastern part of Nidarneset, a small peninsula formed by the river plain at the mouth of the River Nid on the southern shore of Trondheimsfjord. The topographic conditions for medieval Trondheim differ from those of the other Norwegian medieval towns (notably Bergen, Oslo, and Tønsberg), and the protected, historic part of Trondheim contains anthropogenic sediments which lie entirely within an unsaturated environment. A large proportion of these sediments contain wood and other types of organic material. The thickness of the anthropogenic sediments varies greatly from more than 4 m to less than 0.5 m, and they overlie well-drained alluvial sands and gravels. The Directorate for Cultural Heritage (Riksantikvaren) and the Norwegian Institute for Cultural Heritage Research (NIKU) have different roles in the management of cultural heritage sites. However, they cooperate in developing sustainable management and a scientific approach to research, as well as finding practical solutions aimed at securing stable preservation conditions for anthropogenic sediments that are vulnerable and sensitive to environmental changes, both chemical and mechanical. In this paper we present results from environmental investigations conducted in 2007 and 2012 at a location in the central part of medieval Trondheim where an in situ preservation project has been established on the site of new construction work. The project is cross-interdisciplinary, combining archaeological retrieval methods with the sampling and analysis of soil chemical parameters and the monitoring of present basic parameters such as temperature, moisture and redox potential. The monitoring has been ongoing since the beginning of 2013 and will continue until 2017.     

Impact of Roots and Rhizomes on Wetland Archaeology: A Review

The general premise for successful archaeological in situ preservation in wetlands is that raising the water table will ‘seal the grave’ by preventing oxygen from reaching the deposit. The present review reveals that this may not be the entire picture, as a change in habitat may introduce new plant species that can damage site stratigraphy and artefacts. However, reviews on the types and degree of damage caused by vegetation to archaeological remains preserved in situ in wetlands have hitherto only been sporadically treated in the literature. Thus, this paper provides an overview of the adverse effects that various plants species have on the preservation status of wetland archaeology.Disturbance, due to growth of roots and rhizomes of the surrounding soil is denoted contextual disturbance, whereas deterioration of archaeological remains per se acts by several root-related factors that may be spatially and temporally concomitant. In waterlogged anoxic environments, deterioration is mainly related to (i) preferential growth of roots/rhizomes due to nutrient uptake and lesser soil resistance, (ii) root etching due to organic acid exudates, (iii) microbial growth due to root release of oxygen and labile organic compounds, and/or (iv) precipitation of hydroxides due to root release of oxygen. For example, roots of some wetland plants, such as marsh horsetail (Equisetum palustre), have been documented to penetrate archaeological artefacts down to c. 2 m in waterlogged anoxic soils. Here, we demonstrate that cultural heritage site management may unintentionally introduce deep-rooted or exudate aggressive plants by invoking change in hydrological conditions. Moreover, the implementation of biomass energy utilization and agricultural root depth optimization on a worldwide basis stresses the need for more research within root and rhizome impact on archaeological remains in wetlands. In conclusion, the worst-case scenario may be in situ deterioration instead of preservation, and one essential threat to archaeological wetland sites is the impact of wetland vegetation.     

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.     

The development of core concepts of yield management

Abstract

Yield management offers an Operations Manager a decision support framework for examining the revenue and conservation decision variables that integrate the characteristics of the Heritage Visitor Attraction (HVA) experience. The principles of yield management are drawn from the hotel and airline industries to demonstrate how the problem of fixed capacity is managed in other service sectors. This paper compares these principles against Heritage Visitor Attractions (HVAs), suggesting how they could adopt such concepts. As HVAs serve broader objectives, other than profit maximisation, financial pressures are encouraging the operations manager to devise imaginative and new ways of managing sites. Ten core principles of yield management are suggested that are appropriate to Heritage Visitor Attractions. These core principles are used to evaluate Historic Scotland's and the National Trust for Scotland's approach to revenue management.     

Historical mortars dating from OSL signals of fine grain fraction enriched in quartz

In the last years the mortar dating through Optically Stimulated Luminescence (OSL) techniques has become a viable support for chronological estimations (date of construction or restoration episodes) of historical buildings. However, the dating of mortar has still open issues mainly regarding the assessment of the bleaching degree of quartz, the analysis of the OSL processes for this type of samples and the need to do appropriate tests for the most correct evaluation of the equivalent dose. This paper discusses the results obtained by OSL dating (blue diode stimulation) on the polymineral fine grain phase, enriched in quartz, extracted from lime mortar samples collected from different sites. Thermal transfer effects, through the behaviour of Equivalent Dose (ED) and recovery tests, degree and time of bleaching were studied. For each mortar sample the adjacent brick was collected; in some cases, sampling of the bricks bracketing a mortar layer was a possibility, thus obtaining a direct comparison with the standard thermoluminescence (TL) dating on the bricks. The results obtained show, for this set of samples, the possibility of dating the mortars through the use of the fine grain fraction provided of a suitable chemical-physical preparation procedure and the verification of the bleaching conditions.     

An eleventh-century exchange of letters between a Christian and a Jew

A determining factor in the relations between Jews and Christians in the middle ages was the attitude adopted by these two groups towards each other's religious beliefs and customs. One of the most important types of sources we have to gain insight into these attitudes is the reports of dispulations held between Christians and Jews. The significance of one such disputation will be examined here: the correspondence between Wecelin, a convert to Judaism, and Henry, a court cleric of Henry II of Germany, contained in the well-known De diversitate temporum of Alpert of Metz. In the course of this examination new ideas will be offered on the method of study necessary for a correct interpretation of Jewish-Christian polemics. An annotated translation of the exchange of letters between Wecelin and Henry follows.     

Metal provenancing using isotopes and the Oxford archaeological lead isotope database (OXALID)

This paper reviews the research into the methodology of lead isotope provenance studies carried out at the University of Oxford between 1975 and 2002, at first in the Department of Geology (Geological Age and Isotope Research Laboratory), later in the Isotrace Laboratory based in the Department of Nuclear Physics, and eventually part of the Research Laboratory of Archaeology and the History of Art. These 27 years of intensive work, funded initially by the Stiftung Volkswagenwerk, and later from numerous UK Government and Charitable funds and finally by the Institute of Aegean Prehistory laid the foundations of the lead isotope provenance methodology and resulted in a large database of analytical isotope and elemental results. In spite of the efforts of the authors, this database is still not comprehensively published or easily accessible in a digital format by all researchers interested in using this method for their projects. The possibilities of advancing this situation are discussed. The authors discuss in detail the basic restrictions and advantages of using the lead isotope compositions of ores in mineral deposits for finding the origin of the raw materials used for making ancient artefacts. Methods for the scientific interpretation of the data are discussed, including attempts to use statistical methods. The methodology of creating the Oxford lead isotope database (OXALID) is outlined and a summary is given of the lead isotope resource provided by OXALID.