Preserving Archaeological Remains In Situ: Three Case Studies in Trentino,Italy

Abstract

The paper presents the results of the restoration and conservation work which has been carried out in three archaeological areas in the Autonomous Province of Trento. The areas, which have been opened to the public for more than ten years, are the open-air archaeological site of Monte S. Martino, Roman Tridentum (an underground site under the historical city centre of Trento), and Fiavé (a pile dwelling site in a peat bog). These areas present very different environmental characteristics and have therefore required different interventions according to their speci?c situation.

In order to reduce maintenance and extraordinary costs, appropriate conservation of the archaeological remains is required. This consists of methodologies of conservation according to the characteristics of the environment; continuous monitoring systems and indirect preventive intervention; and annual maintenance planning.     

Paper 3: Impact of the Indoor Climate on the Performance of Building Materials Contaminated with Salt Mixtures

Abstract

Archaeological sites are essentially submitted to decay phenomena inherent on their history as well as the environment to which they are exposed after excavation. The history of such archaeological sites is particularly related to their long-term underground conservation conditions during which they were subject to salt migration into the architectural remains.

It is well known that soluble salts present in building materials can cause damage, mainly by producing stresses in the substrate. A lot of research has been done in the past concerning the behaviour of salts in built constructions. However, most studies include single salts, of which the deliquescence points are well documented, while in situ one mostly finds complex salt mixtures, which makes the conservation strategy much more intricate.

The environmental conditions to minimize damage of salt-laden porous building materials can be modelled using a computer program ECOS capable of predicting the crystallization behaviour of salt mixtures. To use the model data of quantitative salt analyses are required as input. The program is then able to predict from a thermodynamic point of view which minerals will exist in the solid state under specified climatic conditions.

This paper deals with the results of a systematic investigation of the salt contamination of the building materials of the Coudenberg site and a prediction of the behaviour of the salt mixture related to the actual climate, as part of the environmental assessment.     

‘I Felt Connected to a Past World’: A Survey of Visitors to Colonial Archaeological Sites Conserved In Situ in Australia and New Zealand

Abstract

While there is extensive international literature on the technology and techniques of archaeological conservation and preservation in situ, there has been only limited discussion of the meanings of the places created and the responses they evoke in visitors. Experience in Australia and New Zealand over the past decade suggests that the conservation of colonial archaeological remains is today seen as a far more desirable option, whereas previously many would have suggested that this kind of conservation was only appropriate in ‘old world’ places like Greece and Italy; and that the archaeology of the colonial period was not old enough to be of value. This paper discusses a recent survey of visitors to colonial archaeological sites which reveals some of the ways in which these archaeological remains are experienced, valued, and understood, and gives some clues as to why conservation in situ is an expanding genre of heritage in this region. The visitors surveyed value colonial archaeological sites conserved in situ for the link they provide to place, locality, and memory; for the feeling of connection with the past they evoke; and for the experience they provide of intimacy with material relics from the past. This emphasis on the affective qualities of archaeological remains raises some issues in the post-colonial context, as it tends to reinforce received narratives of identity and history, and relies on the ‘European’ antiquarian appreciation of ruins — making the urban environment more like Europe by creating evidence of similar historical layering.     

Paper 4: Mechanical Properties of Bricks of the Coudenberg Archaeological Site in View of a Proper Conservation Strategy

Abstract

Archaeological sites are essentially submitted to decay phenomena inherent on their history as well as the environment to which they are exposed after excavation. The history of such archaeological sites is particularly related to their long-term underground conservation conditions during which they were subject to salt migration into the architectural remains. This paper describes the results of drill resistance measurements using a drill resistance measurement (DRMS) device to evaluate the mechanical damage resulting from salt crystallization pressures. Further tetraethoxysilane (TEOS) was applied on powdered bricks of often moist archaeological remains. It was noticed that TEOS serves as potential nutrient for present moulds. The mechanical consolidation effect was evaluated by comparing the hardness profiles after treatment with the reference ones. Bricks used for the construction of the Aula Magna, situated underneath the Royal Square, are characterized by severe patterns of fissures for which the damage diagnosis was built up.     

Managing for Effective Archaeological Conservation: The Example of Salisbury Plain Military Training Area,England

Abstract

Salisbury Plain Military Training Area, Wiltshire, England is the major zone of southern Engizsh chalk downland where archaeological field monuments are comparatively well preserved over large areas. The land is currently managed with regard to military considerations, to its secondary use for forming, and to conservation concerns. Following expressions of concern about archaeological damage, a working party was set up to evaluate the present state of archaeological survival and to recommend for the future. A survey of all sites evaluated their condition by means of a scoring system. Recommendations were made about military use, agriculture, and controlling natural agencies of destruction; and a solution was offered that incorporated eight elements of strategy. The Salisbury Plain study is considered in its context—the English national policy that there should be an archaeological stock-taking of what we have, and a scoring system to make possible some rational choice in selecting from it what is most precious and what is in most need of protection.     

The impossibility of resurrecting the past: Reconstructions on archaeological excavation sites

Abstract

Since the beginnings of archaeological research, scientists have attempted to explain the past to a larger public. In the nineteenth century the quality of reconstruction drawings by architects was high but, after excavations were finished, the sites were left as they were, without conservation, while the movable finds were exhibited in the great museums of the European capitals. Today's mass tourism, however, demands attractions at the original ancient sites. The tourist industry, which brings by far the largest pool of visitors to the sites, sets the standards, but its interests centre on quick and simple ‘consumption’ of impressive ruins. Different methods have been employed in creating tourist attractions – from reconstructing ancient buildings to having museum staff in costume demonstrate elements of daily life in history. But it is the ruins on excavation sites, even in their damaged state, that are the irreplaceable, authentic records of the past. Archaeological preservation, therefore, has to mean uncompromising conservation of the damaged original remains. They should not be sacrificed for the sake of questionable ‘progress’ or popularization.     

Some Issues on the Management of Archaeological Sites in Mainland China

Abstract

The conservation of archaeological sites in mainland China has not attracted much academic and public attention until recently. However, after the 1990s, both the Chinese government and academia have been increasingly concerned with the management of archaeological sites, as illustrated by the introduction of national guidelines (China Principles) and the establishment of research centres in universities and research institutes. Economic development and related social needs are major driving forces behind this phenomenon, while the impact of globalization on academic development in China cannot be denied. However, the natural and social environments in mainland China, as well as the characteristics of archaeological sites, differ from other countries, and whether international principles regarding conservation and management of archaeological sites are applicable to China needs to be considered. While it is a challenging task for mainland Chinese scholars to find suitable strategies to conserve and manage hundreds of thousands of archaeological sites, the problems and experiences in the process of applying international principles to China may provide valuable lessons, not only for Chinese scholars but also for scholars in other areas.     

A microarchaeological approach for the study of pits

Abstract

The study of the technology underlying pre-industrial storage structures has an interest from an anthropological and archaeological perspective, in terms of the evolution of key cultural and cognitive capabilities, often related to the transition to food production.

Microarchaeological techniques offer a unique perspective on the study of pre-industrial storing technologies. In this work, examples are presented from two archaeological contexts in different climatic and socio-ecological situations during the Holocene in S Asia and SW Europe. Microarchaeological techniques used in this study include micromorphology, Fourier transform infrared spectroscopy and phytolith analyses. The comparative study of two pits highlights key aspects of the decision-making process involved in technological solutions of storage: ? The choice of a location for the construction of a given storage facility is highly affected by contextual climatic, microclimatic, soil and bioturbative factors

? The time taken to consume stored foodstuffs seems to affect technological investment as much as the intrinsic conservation requirements of the stored taxa

? The use of fire to hygienise pits implies that such structures were not conceived for single use

? Pre-industrial storage systems can be seen as modular structures, which components (e.g. topographical location, sediment type, lining type, hygienisation techniques and cover) can be recombined to improve storage performance for different climatic settings and foodstuffs.

     

Site Conservation in Morocco: The Emergence of a Practice at Aghmat

Abstract

It is still uncommon for foreign and national archaeological excavations in Morocco to include architectural or site conservators during the excavation and post-excavation periods. The few existing examples of conservation have all been carried out long after the site or the building had been excavated. The site conservation activities during the Aghmat excavations in summer 2006 illustrate how the presence of archaeological conservators, advising the archaeological team and implementing urgent interventions, has ensured a safe excavation and has contributed to the preservation of the physical integrity of the excavated buildings. The excavation of the imposing archaeological features of the medieval bath of Aghmat provided the first opportunity in Moroccan archaeology for Moroccan archaeological conservators to be involved in condition assessment, planning, and provision of conservation activities to preserve the bath.

The primary aim of this paper is to present the site conservation experience in the Aghmat project, which is the first such project to be initiated during an excavation, and to be conducted mainly by a Moroccan team; it aims also to highlight the conservation procedures adopted and to incite discussion.     

A Qualitative Approach for Assessment of the Burial Environment by Interpreting Soil Characteristics; A Necessity for Archaeological Monitoring

Abstract

Modern-day archaeological monitoring is often hampered by lack of money, lack of time, inadequate measuring equipment, and lack of insight in the conservation potential of a site.

Although in modern archaeological excavations soil characteristics are noted (colour, texture, groundwater level, and sometimes mineralogy), these characteristics are mainly used for the interpretation of a site. However, by looking to these characteristics from a conservational view eventually combined with the conservation status of the archaeological objects, much can be learned about the burial environment. This is essential for optimizing archaeological monitoring.

Degradation processes result from the change of reactive phases in the soil or the site. Reactive phases are soil components such as organic matter, sulfides, iron(hydr)oxides and carbonates (chalk, shells), and, if present, components in the ground or interstitial water such as hydrogen ions and sulphate. The presence of these phases can easily be established by the archaeologist or soil scientist in the field. We propose a simple field-based method for assessing degradation processes essential for in situ preservation and monitoring.     

Malta’s Unintentional Consequences: Archaeological Heritage and the Politics of Exclusion in the Netherlands

Abstract

We argue that the apparently successful implementation of the European Malta Convention (1992) in the Netherlands resulted in a relatively closed archaeological policy system, which separates ordinary people from experts. As a result, citizens were increasingly excluded from the archaeological process. The process of closure and exclusion is made visible by investigating Dutch amateur archaeologists and their changing roles within Dutch archaeology. Amateur archaeologists are a group of semi-experts often deemed essential to the quality of research and policy regarding archaeological heritage. Their marginalization after Malta caused discussion and frustration, undermining public support for the initial policy goal of the Malta Convention: conservation of archaeological heritage. Our analysis draws on recent academic debates concerning the policy-practice nexus in processes of Europeanization. Reducing negative side effects and re-targeting policies for greater efficacy and democracy requires insight into the pathways of implementation.     

Complications and Effectiveness of In Situ Preservation Methods for Underwater Cultural Heritage Sites

Abstract

Underwater Cultural Heritage (UCH) as an outstanding division of the cultural heritage of humanity appears to be crucial and complicated when more general issues regarding preservation and conservation are raised. The essence of in situ preservation should be equally discussable for any kind of archaeological remains; on land or underwater.

There is a long history of different methods and concepts of intervention in a variety of sub-aquatic archaeological sites; from shipwrecks to submerged settlements. This paper will present an introduction to different techniques and theories of preservation and conservation of underwater cultural and archaeological sites since this kind of heritage has scientifically been explored and studied. A range of different preservation methodologies, from total or partial transference inland, to preservation underwater, will be compared; the advantages and disadvantages of each option will be highlighted. Different examples of international best practices will be illustrated. Different types of in situ conservation/protection will be explained and categorized. Furthermore, there will be a focus on the UNESCO Convention of 2001 on Conservation and Preservation of UCH, where the in situ conservation option has been recommended.

Moreover, the technical issue for preservation of UCH sites, either in situ or after displacement, will be explained. The implication of relocation for different sorts of sites and materials will be argued; for example, cases where some sites, such as shipwrecks, would more easily be displaced compared with submerged settlements, villages, or ports.

Finally, by stressing that the state of ‘being underwater’ makes many sites qualified to be regarded as UCH, the in situ preservation approach will prevail that this state is maintained.     

Designing protective structures at archaeological sites Criteria and environtnental design tnethodology for a proposed structure at Lot's Basilica,Jordan

Abstract

This paper sheds light on the need to assess the efficacy and performance of protective structures at archaeological sites according to design criteria derived from various elements in heritage management processes. The paper also focuses on the use of architectural design methodologies that essentially correspond to physical conservation requirements at archaeological sites. The paper, in effect, introduces climatic approaches to the design of protective structures at archaeological sites. It further illustrates the value of computer-based environmental simulation and modeling tools in the design phase of projects. Despite their limitations, these tools help guide design processes, and generally indicate future conservation effectiveness and performance of protective enclosed structures at archaeological sites.     

Deep Impact: What Happens When Archaeological Sites are Built on?

Abstract

Increasingly, developers and archaeologists search for ways to build on archaeological sites, while at the same time preserving the remains underneath. However, deciding which effects of construction on archaeological sites are acceptable and which are not is hampered by the lack of knowledge on the impacts of construction on archaeological sites. This paper provides an update on some of the effects of building on archaeological sites. Recent research had shown that displacement piles cause less disturbance in soft soils than previously thought. Moreover, replacement piles may be less benign that assumed up till now. Effects of loading on archaeological sites are described, and gaps in the knowledge on these effects are indicated. More research is needed in this field, especially on predicting soil disturbance and damage to weak materials. Impermeable surfaces and constructions on top of sites may affect the visibility of soil features due to decreased rainwater infiltration. Finally, a series of non-physical effects are mentioned that will have to be taken into account when deciding on allowing building on archaeological sites.     

Monitoring the burial environment of terrestrial wet archaeological sites in The Netherlands

Abstract

Monitoring the burial environment of archaeological sites is necessary to assess the success of their preservation in situ. Also, monitoring the state of preservation of actual archaeological remains together with that of their burial environment will further our understanding of the degradation processes acting on archaeological remains in situ. These remains consist not only of objects made from wood, metal, stone, etc., but also of pollen, soil features and even micromorphological features. Although, to date, the precise degradation mechanisms of archaeological remains in situ are not yet fully understood, general agreement exists on which parameters should be monitored in wet terrestrial environments. Also, it has been established that in situ measurements are preferable to laboratory analyses of soil (water) samples. In practice, it is difficult to find suitable monitoring equipment for in situ measurement as it must meet many requirements: an in situ measuring principle; stable for a period of at least several months; robust for use in the field; and equipped with a datalogger. A suitable principle exists for measuring the redox potential, however a simple, robust field instrument with datalogger is not yet available. Monitoring of the water table level, temperature and oxygen content is possible with recently developed, commercially available instruments. Monitoring of acidity is less complex as it does not vary as rapidly as, for example, the redox potential; however, the recommended method is still based on analysing soil samples, which is not acceptable in the long term at archaeological sites.     

Administration of parks with rack art: A symposium and workshop in Jujuy Argentina,December 2003

Abstract

Visits to archaeological sites, within school, a history or archaeology club, or a family group, are the main means for young people to engage with the archaeological historic environment. The majority of archaeological sites easily accessible for such groups are those that have been 'sanitized' for public consumption. These are often devoid of explanation of the archaeological process which made them accessible. This paper looks at the contribution that working archaeological sites can make to young people's understanding of archaeology, with particular reference to visits made by branches of the Young Archaeologists' Club, based in the UK.     

Long-Term Preservation of Dendroarchaeological Specimens and In Situ Preservation: Problems and Practical Solutions

Abstract

Dendrochronology offers a unique opportunity to address archaeological questions with minimal invasiveness. Often, archaeological tree-ring sampling, and occasionally analysis itself, can be performed while the larger structure or object remains in situ. In comparison to the costs and benefits of excavation (complete or partial) and a growing international call for in situ preservation, dendrochronology provides an effective compromise for the interpretation of wooden material culture.

The current number of archaeological tree-ring specimens worldwide probably exceeds 2,000,000. These specimens have been obtained from thousands of historic buildings, shipwrecks, and other sites and artefacts. These specimens are housed by a variety of public and private entities: museums, universities, governments, private corporations, and individuals. Despite their importance as vouchers for archaeological dates and great potential for future use and new applications, generally little attention has been paid to the long-term curation of tree-ring specimens. This paper identifies some pressing curation problems and suggests that the value and nature of dendroarchaeological research is compatible with international calls for in situ preservation. Some practical suggestions, provided here, could drastically improve the long-term curation of dendroarchaeological specimens, further demonstrating the methodology as a viable and valuable partner to in situ preservation.     

A botanical approach to the planning of archaeological,parks in Italy

Abstract

The positive role of plants in archaeological areas, as well as the enegative action of their roots in causing structural damage, are summarized in this paper. The traditional approach to the planning of vegetation in Italian archaeological areas is briefly described. A general philosophy for botanical projects in these sites is proposed, taking into account ecological, historical and conservation parameters. The principal aims of the suggested approach are: protection of the naturalistic, historical and landscape features of the existing site, in so far as they are compatible with the archaeological structures; and the introduction of new elements, in keeping with the original landscape, which exploit shelter effects or improve microclimatic and soil characteristics, and are also ‘ornamental’. The criteria for evaluating the characteristics of the site from the naturalistic and from the historical and landscaping points of view are explained. Also briefly. discussed, are congruity with the history and character of the site, overall compatibility with archaeological structures, usefulness for reconstructing specific environments, conservation Value for the site and aesthetic and economic criteria for the selection of species to introduce.     

Editorial Introduction

Abstract

International response to the problem of looting of archaeological sites has been hampered by the difficulty of quantifying the damage done. The scarcity of reliable information negatively impacts professional and public policy making, rendering consensus about the scale of the problem and the effectiveness of policy responses difficult to achieve. We report here on the use of publicly-available satellite imagery for quantifying the damage caused by looting of archaeological sites in Jordan. The ease of use and affordability of imagery such as that provided by Google Earth make the identification, quantification, and monitoring of archaeological site looting possible at a level previously unimagined. Our findings about looting at archaeological sites in Jordan shed light on the potential for a broader application of the method.     

Flotation versus dry sieving archaeobotanical remains: A case history from the Middle Horizon southern coast of Peru

Abstract

During excavations at the site of Casa Vieja located in the Peruvian coastal desert, archaeological plant remains were systematically collected to assess whether it is more productive and informative to sieve sandy sediments in dry environments or to process such samples by water flotation, a persistent methodological concern. At Casa Vieja, dual subsamples were collected and analyzed using both of these procedures. For dry, sandy sediment conditions, each processing strategy was found to yield a different view of the botanical remains. Dry sieving recovers more of the larger plant specimens whereas water flotation yields more of the smaller-sized material. These results should be incorporated into archaeological research designs in the future, especially for desert environments.