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.     

Widespread diffusion of technical innovations around 300,000 years ago in Europe as a reflection of anthropological and social transformations? New comparative data from the western Mediterranean sites of Orgnac (France) and Cave dall’Olio (Italy)

During MIS (Marine Isotope Stage) 9 and the transition to MIS 8 – around 350–300,000 years ago – some lithic assemblages in Europe reflect marked transformations in technical behavior. These transformations involved the standardization of products and the development of diversified and elaborated débitage methods which are considered to be markers of the transition from the Lower to the Middle Palaeolithic i.e. from Mode 2 to Mode 3. Taking the analysis of the sites of Orgnac 3 (Ardèche, France) and Cave dall’Olio (Emilia Romagna, Italy) as a starting point, this paper discusses the variability of these assemblages in Southern Europe as well as the social and anthropological implications of the emergence of new technical behavior. It also aims to show that common features existed both in Northern and Southern Europe. The development of more complex technical systems on a progressively wider territory and at an increasingly earlier age argues in favor of the hypothesis of a close connection with the process of “Neanderthalisation”, possibly accompanied by the transmission of ideas through extensive social networks.     

Different approaches to date bricks from historical buildings

The application of Thermally (TL) and Optically (OSL) Stimulated Luminescence on bricks used as building material has allowed solving an chronological issue in the field of historical building dating. The possibility to use one or more methodologies of dating is closely related to the luminescent and granulometric characteristics of the sample. Using some brick samples collected in the church of Sain Seurin in Bordeaux (France), this paper discusses the implications and the possibility to use different approaches and techniques for dating. With this aim luminescence measurements were performed on both polymineral fine grain and quartz inclusion phases extracted from each brick. For Equivalent Dose (ED) and consequently age determination, TL on mixed fine grain fraction (FG), OSL on quartz inclusions (QI) and on mixed fine grain (FG*) fraction, were used. The results obtained suggest the advantage of using OSL technique on fine grain fraction cleaned up by IR stimulation (FG*), but the use of quartz inclusion represents indeed a good alternative.     

Human Rights and the Pink Tide in Latin America: Which Rights Matter?

Latin America witnessed the election of ‘new Left’ governments in the early 21^st century that, in different ways, sought to open a debate about alternatives to paradigms of neoliberal development. What has this meant for the way that human rights are understood and for patterns of human rights compliance? Using qualitative and quantitative evidence, this article discusses how human rights are imagined and the compliance records of new Left governments through the lens of the three ‘generations’ of human rights — political and civil, social and economic, and cultural and environmental rights. The authors draw in particular on evidence from Andean countries and the Southern Cone. While basic civil and individual liberties are still far from guaranteed, especially in the Andean region, new Left countries show better overall performances in relation to socio‐economic rights compared to the past and to other Latin American countries. All new Left governments also demonstrate an increasing interest in ‘third generation’ (cultural and environmental) rights, though this is especially marked in the Andean Left. The authors discuss the tensions around interpretations and categories of human rights, reflect on the stagnation of first generation rights and note the difficulties associated with translating second and third generation rights into policy.     

Heat Treatment of Mineral Pigment During the Upper Palaeolithic in North‐East Italy

The use of red ochre for utilitarian, symbolic and artistic purposes is widely documented in prehistoric contexts. The absence of adequate red‐coloured raw materials influenced the development of technological activities aimed at modifying the original physiochemical properties of yellow ochre. The heat treatment of goethite to obtain hematite was investigated in the western sector of the Lessini Mountains in north‐east Italy, where red ochre was found in the (Proto)Aurignacian levels at Fumane cave and in the Late Epigravettian sequence at Tagliente rockshelter. The combination of X‐ray powder diffraction (XRPD) and transmission electron microscopy (TEM) proved that heat treatment was a common practice in the studied archaeological sites due to the scarce availability of suitable hematite‐based material in the region.     

A brief description of the ordnance survey,and some notes on the advantages of a topographical survey of South Africa

Early maps of Scotland at a national scale provide historical geographers with an important source of data. One of the most important of these maps but still relatively unexploited and poorly understood is the Military Survey of Scotland or Roy Map. Examination is made here of its two versions, the Protracted Copy and the Fair Copy, to check the veracity of the draughtsmen who produced the latter and most commonly consulted version. An examination is made by focussing on two areas of Fife.