Luminescence characteristics and dose distributions for quartz and feldspar grains from Mumba rockshelter,Tanzania

Mumba rockshelter is a key archaeological site for the Middle and Later Stone Age occupation of East Africa, but its chronology has remained unresolved. We report the results of a dating study, focussing on the characterisation of the optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL) properties of quartz- and potassium-rich feldspar grains. Quartz has previously proven troublesome for dating in East Africa. We identified five general types of quartz grain behaviour, based on the shapes of their OSL decay and dose–response curves. Dose recovery experiments and measurement of the natural samples revealed particular problems with quartz grains that had hyperbolic dose–response curves, low characteristic saturation doses and anomalously large changes in sensitivity between regenerative-dose cycles. The use of pulsed irradiation during measurement and standard and additional quality-assurance criteria during data analysis reduced the number of grains that suffered from these problems. We applied these procedures to individual grains of quartz from eight samples and, using appropriate statistical models, identified post-depositional mixing in three samples. The remaining samples had scattered equivalent-dose distributions typical of quartz grains that had received variable beta dose rates during burial. Stratigraphically consistent OSL ages were obtained for all but the deepest sample. Feldspar ages were estimated for the latter sample and three other samples, using the elevated temperature IRSL signal that exhibited low rates of anomalous fading. Fading-corrected feldspar ages for the latter three samples are consistent with their single-grain quartz ages, but single-grain dating is needed to address problems of post-depositional mixing.     

Diet,social differentiation and cultural change in Roman Britain: new isotopic evidence from Gloucestershire

This study uses stable isotope analyses (δ¹³C and δ¹⁵N) of human bone collagen to reconstruct the diet of three Romano-British (first to early fifth century AD) populations from Gloucestershire in South West England. Gloucestershire was an important part of Roman Britain with two major administrative centres at Gloucester (Glevum) and Cirencester (Corinium) and numerous smaller settlements and farmsteads. To investigate potential dietary differences between the rural and urban populations of Roman Gloucestershire, we compared human bone collagen stable isotope values from 32 individuals from urban Gloucester with those of 46 individuals from two rural cemeteries at Horcott Quarry and Cotswold Community, respectively. Seven individuals from urban Gloucester were buried in a mass grave; all others were buried in single inhumations. Results show small but significant differences in stable isotope ratios between the urban and rural populations which indicate that the urban population might have consumed slightly more marine and/or freshwater resources than the people living in the rural communities. We interpret this difference as a direct reflection of Rome’s influence on Gloucester’s population and the town’s economic status. Subtle differences in stable isotope ratios were also observed at the site level, as burial practice does correlate with diet in some cases. Overall, the results from this study demonstrate that diet, as reconstructed through stable isotope analysis, is a very sensitive, if settlement-specific, indicator of social differentiation and culture change.     

Netzwerk DVAG

DVAG intern

Netzwerk DVAG     

Interpreting Past Human Diets Using Stable Isotope Mixing Models—Best Practices for Data Acquisition

Journal of Archaeological Method and Theory - Using stable isotope mixing models (SIMMs) to quantify past diets is becoming increasingly common in archaeology. This study highlights important...     

Current approaches to teaching introductory physical anthropology

Joseph B. Birdsell. Human Evolution: An Introduction to the New Physical Anthropology. Chicago: Rand McNally, 1972. xiii + 546 pp. Illustrations, figures, bibliography, and index. $9.95

Bobby J. Williams. Evolution and Human Origins: An Introduction to Physical Anthropology. New York: Harper & Row, 1973. ix + 277 pp. Illustrations, bibliography, and index. $10.95.     

Antidote to Alienation: The Voluntary Association in the Work of Robert Nisbet

Abstract

The American sociologist Robert Nisbet argued that alienation was endemic in the modern world. He blamed processes of individualization and politicization where political power was utilized to separate individuals from intermediate associations. While Nisbet was accused of nostalgia for a lost past of medieval communalism, he pointed to the voluntary association as a source of community in the modern world. Using Nisbet's historical and sociological analysis, this article explains the phenomena of alienation in Nisbet's thought and argues that the voluntary association is capable of integrating individuals into meaningful communities.