Subterranean transport and deposition of quartz by ants in sandy sites relevant to age overestimation in optical luminescence dating

An artificial layered sandy site was created using a combination of native sand and colored sand (3 parts native uncolored quartz, 1 part colored quartz) in Apalachicola National Forest near Tallahassee, Florida. Twelve layers of sand, each 1 by 1 m in horizontal extent by 10 cm in thickness were emplaced to a depth of 2 m followed by implantation at the surface of a Florida harvester ant (Pogonomymrex badius) colony (the lower two layers were 50 cm thick). The colony excavated a nest, and after 7 months, the sand layers were excavated to the base to test the hypothesis that sand grains were moved upward within the ant nest without reaching the surface. The ants penetrated 11 of the 12 colored layers reaching a depth of 130 cm. Thirty nine sticky-acetate peels of ant chamber floors were collected and colored sand grains were counted under a microscope. More than 16,000 grains were identified in layers that did not originally host them. Of these, more than 80% were unambiguously moved upward. This means that possibly as many as 54,000 upwardly mobile grains were present (ratio of 3:1 uncolored to colored). In relation to optical luminescence (OSL) dating, this means that grains that would not have been optically zeroed by transport to the surface (defined here as subterranean-transported) were present in abundance, and that if the site was ancient, there would have been found many grains that were older than the layers they presently reside in, even if only one colony of harvester ants had disturbed the layers. This is in addition to the fact that backfilling of chambers and tunnels may contribute even more significantly to the presence of a subterranean-transported component of an OSL sample. We conclude that ants can significantly affect the age distributions in sandy archaeological sites. Multiple examples of such disturbances have been documented in the literature. Most relevant to our results are recent studies of the OSL chronology of Pre-Clovis-age and Palaeoindian age archaeological sites in sandy environments in North America that may have been compromised by ant bioturbation of quartz sand grains. Here we have examined in detail the potential effects of one episode of ant nest-building on the age overestimation of affected sediments. From this we found that as few as 12 episodes of bioturbation involving backfilling of chambers in the same volume of sand could lead to the presence of 1 contaminant grain per 50 grains of sample.     

Struggles of recognition: adverse effects of China’s living human treasures program

ABSTRACT

Heritagization processes have resulted in struggles of recognition across the globe. Scholarly work has demonstrated that determining what and whose cultural architecture, objects and practices are to be considered ‘heritage’ results in inclusion and exclusion effects which deprive some individuals, communities or ethnic groups of recognition. Many of these studies build on Western theories of recognition as developed by Axel Honneth or Nancy Fraser. However, due to the Western origin of these theories and – in most cases – application to democratic nation-states, the question arises whether Western theories of recognition can in fact be applied to non-Western authoritarian states. Taking the Chinese LHT system, the so-called ‘representative ICH Inheritor program,’ as a case study, I explore to what extent Western theories of recognition explain struggles of recognition in PR China. I argue that while these theories are useful in explaining the effects and purposes underlying struggles of recognition, authoritarian regimes like China may exacerbate struggles of recognition since their ‘institutional patterns of value recognition’ can more openly and forcefully use recognition and misrecognition as a tool to foster political and economic objectives. However, citizens respond by resigning, contesting or circumventing official decision-making processes.     

Comparative Approaches to Visions of Community

The aims of the first VISCOM conference were to compare different methods employed in the study of community to address new methodological perspectives for the analysis of categories of identification and belonging, the conditions and processes of the making of communities across large cultural and geo-political fields. At the same time, this exchange was meant to provide thorough reflections on the process of comparative research itself. This contribution sets out to discuss the diversity and creative tension of these methodological approaches before proceeding to outline how they may contribute to future collaboration both within the VISCOM project and beyond in interdisciplinary and, eventually, in transdisciplinary collaboration between historians and socio-anthropologists. The text thus focuses on the methodological tools and the very practical research processes addressed at the conference and in the case studies brought together in this thematic issue. It will specifically address the challenge to develop comparable, but contextually differentiated approaches to different types and amounts of medieval source material across time and space, viewing the methodological and conceptual framework of the project and the contributions of this issue as a toolbox. I will thus take up the claims of several contributors to more thoroughly contextualise the very conceptual notions underlying our research (such as identity, ethnicity and community) and argue in favour of a less “loaded” and more flexible conceptual vocabulary developed in close relation with the source material to cope with the high diversity of sources and methodological approaches.     

Liebe Leserin, lieber Leser,

Ohne Zusammenfassung     

Liebe Leserin, lieber Leser,

Ohne Zusammenfassung     

On the provenance and manufacture of red-slipped fine ware from ancient Cassope (NW Greece): evidence by X-ray analytical methods

Energy-dispersive X-ray fluorescence spectroscopy was used to characterize red-slipped pottery (2nd–1st century BC) from ancient Cassope, north-western Greece. The compositional data were statistically treated by principal component analysis and chemical groups were established, representing locally produced and imported items. Mineralogical investigation by X-ray diffraction indicated firing temperatures in the range from 850 to 1000 °C for most of the sherds, while one group consisted of over-fired items, possibly in excess of 1050 °C. The morphology and elemental composition of the ceramic bodies and surface slips were examined through scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. The analyses revealed that different pottery groups exhibit surface slips of different nature, in terms of thickness, degree of vitrification and elemental composition. Overall, the diversity in technological characteristics of the examined sherds is indicative of the socio-economic conditions prevailing in Cassopaea during the late Hellenistic period.     

Evidence for size increase in an exploited mollusc: humped conch (Strombus gibberulus) at Chelechol ra Orrak,Palau from ca. 3000–0 BP

Past research has suggested that the humped conch (Strombus gibberulus), a species common in many prehistoric archaeological sites in the Pacific, declines in size and/or abundance over time. Explanations for this phenomenon largely revolve around the possibility that they were overharvested by human populations. In this study, we measured the length and width of over 1400 individual specimens of S. gibberulus shells recovered from the site of Chelechol ra Orrak in Palau, western Micronesia, in deposits dating from ca. 3000 BP to the present. Statistical analysis indicates that in contrast to previous reports, there is a significant size increase for this taxon through time which may be the result of a combination of anthropogenic and environmental factors. We discuss variables influencing mollusc size and suggest that, given the complexities of their interactions and the data limitations of archaeomalacological assemblages, unambiguous determination of the cause(s) of molluscan size change may not always be possible.