Distinguishing between calcites formed by different mechanisms using infrared spectrometry: archaeological applications

Infrared spectrometry is a well-established method for the identification of minerals. Due to its simplicity and the short time required to obtain a result, it can be practiced on-site during excavation using portable infrared spectrometers. However, the identification of a mineral may not be sufficient. For example, a lime plaster floor and a crushed chalk surface have a similar appearance and are composed of the same mineral – calcite. Here we exploit differences in the infrared spectra of geogenic, biogenic and pyrogenic calcites for the identification of each calcite type. The infrared calcite spectrum has three characteristic peaks in the region of 400–4000 cm⁻¹, designated ν₂, ν₃, and ν₄. When a calcite sample is ground, as part of the measurement preparation procedure, some grinding dependent changes will be revealed in the infrared spectrum. With additional grinding, the ν₃ peak narrows and the heights of the ν₂ and ν₄ peaks decrease, when both are normalized to the ν₃ height. By plotting the normalized heights of the ν₂versus the ν₄ of several grindings of the same sample, a characteristic trend line is formed for each calcite type. The trend lines of geogenic calcites have the shallowest slopes and highest ν₄ values when compared to pyrogenic calcites, which can be further divided to ash and plaster/mortar samples. This method can assist in distinguishing between the various calcites, and provide insights into homogeneity and preservation state of the calcitic materials in question.     

Does size matter: the role and significance of cereal grains in the Indus civilization

Cereal grains play a pivotal role in the rise and character of the Indus civilization. Archaeologists have traditionally focused their attention on the large-grained crops of wheat and barley while often minimizing the importance of the smaller-grained millets. Both environmental and cultural variables influence crop selection in the past as well as today. This paper explores the role and significance of cereal grain size during the evolution of the Indus civilization.     

Building a tephrostratigraphic framework for the Paleolithic of Central Anatolia,Turkey

The Central Anatolian Volcanic Province (CAVP) in Turkey preserves widespread deposits of Quaternary tephra, presently associated with a small but growing number of Paleolithic archaeological sites. We use multivariate analyses of the abundances of a suite of nine major and minor element oxides determined by electron probe microanalysis. From these data, we construct a classificatory model for correlating distal tephra to one of five volcanic edifices or eruptive phases within the CAVP. Application of this model to distal deposits of primary tephra-fall and reworked tuffaceous sediments from the archaeological sites of Körkuyu and Kaletepe Deresi 3 indicates Late to possibly Early Pleistocene ages for the artifact assemblages there, and provides a fundamental tephrostratigraphic framework to examine spatial and temporal variation in hominin behavior comparable to that of other regions, such as eastern Africa.     

A biometric technique for assessing prehistoric freshwater mussel population dynamics (family: Unionidae) in north Texas

Biometry is useful for a suite of analyses relevant to zooarchaeology, which include analysis of mortality profiles, taphonomy, paleoecology, among other purposes. Here, size-age prediction models are developed for 10 freshwater mussel species found in north Texas to develop a method for studying paleoenvironmental conditions. Shell length is often used to evaluate the structures of modern mussel populations, but its use on paleozoological specimens is not feasible because complete shells rarely preserve. Instead, pallial line-to-lateral teeth length (PLL) and pseudocardinal teeth-to-pallial line length (PSP) are evaluated as proxy measures for shell length. Linear regression models based on PLL and PSP using modern mussels demonstrate that they are accurate proxies of shell length for multiple species from a variety of habitats. In addition, ontogenetic-age structures for a modern sample and for two late Holocene assemblages from north Texas are developed using PLL and PSP. These techniques are useful tools for evaluating past ecological conditions of freshwater mussel populations when large samples are available for study, which expands analytical potential of zooarchaeological studies of prehistoric unionid remains.     

Tactical Flexibility: Libyan Foreign Policy under Qadhafi, 1969–2004*

On September 1, 1969, a group of junior Libyan Army officers took control of the Libyan government in a bloodless coup d'état. After the coup, the group formed the Revolutionary Command Council (RCC), chaired by Muammar al‐Qadhafi. In the four decades following, Libya faced numerous foreign policy challenges. The Qadhafi regime took on a distinctly anticolonial flavor that mirrored the revolutionary political trends of Egypt under of Gamal Abdul Nasser. This change in foreign policy posture shook Libya's relations with the United States and the United Kingdom and initiated the degradation of Libyan–Western ties. Under Qadhafi's leadership, Libya chose an ideological path for that focused on the strengthening of sovereignty while pursuing policies of unity and anti‐imperialism. This often put Libya at loggerheads with the West, and at times with its neighbors. Nevertheless, Qadhafi maintained popularity among his constituency. ¹ His domestic fame was the product of a carefully constructed persona that gave him the charismatic appeal necessary to maintain leadership during the latter quarter of the twentieth century and into the new millennium. Publicly, Qadhafi highlighted the similarities between himself and Libya's rural working class. He lived in a tent, and wore modest clothing. He fancied himself a devout Muslim, and praised the wisdom of the Libyan masses. He connected with his constituency through rhetoric that illustrated the stability of his policies over time, and their connection to the ideas that originally made him popular. This argues that the source of Qadhafi's charismatic power lay in his rhetoric, which connected Libya's foreign policy decisions to his foreign policy vision, the basis of his charismatic leadership. Qadhafi articulated his foreign policy vision during his first major speech to the Libyan people in September 1969, and he referred to it time and again when speaking about major Libyan foreign policy decisions. To demonstrate, this article describes the basis of Qadhafi's leadership authority and defines the parameters of his vision. Then Qadhafi's rhetoric surrounding major shifts in Libyan foreign policy is analyzed to show its congruence with his foreign policy vision. The rhetoric surrounding the Libya–Egypt war, the end of Libya's Chad intervention, Libya's surrendering of the two Lockerbie bombing suspects to be tried under Western authority, and Qadhafi's denunciation of the weapons of mass destruction programs—all major shifts in Libyan foreign policy—demonstrate how Qadhafi was able to maintain a single message, and thus his authority, over his first 35 years in power based on values established in the early days of his revolution. The flexibility of his vision enabled Qadhafi to maintain authority, while tactically adjusting Libyan foreign policy positions.     

Geochemical indicators of preservation status and site deterioration at Star Carr

This paper presents the results of a project aimed at investigating the deterioration of organic remains at the Mesolithic site of Star Carr. Analyses of pH, Electrical Conductivity and Redox Potential are reported from borehole transects across the unexcavated part of the site. A comparison of field and laboratory measurements is made, leading to the characterisation of different preservation zones and identification of ‘vulnerable’ sediments at the site. These data are augmented by geochemical analyses of contemporary borehole sequences and adjacent historic monoliths. Analysis of surface water and groundwater has also been undertaken to assist in the interpretation of the site hydrology and geochemistry. The relationship between ‘natural’ geology and preservation potential, and the evidence for a ‘halo’ preservation effect in virgin sediments adjacent to previous archaeology trenches is investigated.     

Stability of phytoliths in the archaeological record: a dissolution study of modern and fossil phytoliths

Opaline phytoliths are important microfossils used in archaeological and ecological research. Relatively little is known about the stability of phytoliths after burial. Under alkaline pH conditions they can dissolve, and mechanical disturbances can cause a loss of their more delicate appendages. Here we present an experimental study of phytolith stability (combination of solubility and abrasion). Modern and fossil phytoliths were extracted from wheat using new methods to minimize dissolution, and by burning in an oven. These assemblages were placed in a solution buffered to pH 10 and maintained under constant temperature and shaking conditions. The silicon concentrations in the solution were monitored once a week for 5 weeks. The phytolith morphologies in each assemblage were determined at the outset of the experiment and after 5 weeks. The results show that there are differences in stability between various assemblages. Modern inflorescence wheat phytolith assemblages are more unstable than those from leaves/stems. Burnt assemblages are less stable than unburnt assemblages, and a fossil phytolith assemblage about 3000 years old is more stable than the modern wheat assemblages. The results also show that individual phytolith morphotypes have different stabilities, and as a result of dissolution and abrasion, some morphotypes may resemble others. This study further shows that archaeological and/or paleo-environmental interpretation of phytolith assemblages may change with the assemblage’s state of preservation.     

Spirit knows: materiality,memory and the recovery of Spiritualist places and practices in Stoke-on-Trent

Abstract

Much has been written about constructing memories of place, yet few speak of the difficulties in dealing with lost, partial and fragmented histories of place. We argue that behind the idea of ‘memory of place’ is an assumption that these memories are recoverable and can build a sense of place. Our research has led us to assume the opposite: not just that the fragments of history cannot build a complete memory of place, but that this understanding of memory and place is itself skewed by its reliance on materiality. This paper stems from a project that explores the place of spirituality in everyday life through insights from Spiritualist churches and their congregations. Whilst evidence of Spiritualist locations can be partially obtained through documentary records, a key challenge has been in understanding practices in the context of Spiritualism’s disassociation with materiality and the centrality of Spirit. The paper concludes that retracing Spiritualism’s past, and capturing its contemporary spiritual practices, uncovers a ‘memory of place’ that is not only in constant transience, but that can only be known through Spirit.