QUANTIFICATION AND DISTRIBUTION OF LIPID IN ARCHAEOLOGICAL CERAMICS: IMPLICATIONS FOR SAMPLING POTSHERDS FOR ORGANIC RESIDUE ANALYSIS AND THE CLASSIFICATION OF VESSEL USE

Organic residue analysis has been performed on 62 reconstructed vessels from a single archaeological site (Rounds, Northamptonshire, U.K.). In order to establish regions of lipid accumulation within a vessel, sherds were sampled from different parts of a vessel, for example base, body and rim, and submitted to lipid extraction procedures. The techniques of high-temperature gas chromatography (GC) and GC/mass spectrometry (GC/MS) were then used to analyse the sherd lipid extracts. The quantitative results obtained show differential accumulation and preservation of lipid in various parts of the same vessel. This latter observation has serious implications for the sampling of potsherds for organic residue analysis. Furthermore, the amount of absorbed lipid varies quite considerably between vessel types. On this basis, a new method is proposed for classifying vessel use by comparing the concentration of lipid present in different parts of individual vessels.     

Book reviews

Regions Reconsidered: Economic Networks, Innovation and Local Department in Industrial Countries. Edward Bergman, Gunter Maier and Franz Tödtling (Eds), London: Mansell Publishing Limited, 1991, 312pp.

Travel Sickness: The Need for a Sustainable Transport Policy for Britain. J. Roberts, J. Cleary, K. Hamilton and J. Hanna (Eds), London: Lawrence and Wishart, 1992, 358pp.

Endogenous Development and Southern Europe. G. Garofoli (Ed.), Aldershot: Avebury Press, 1992, ISBN 1 85628 1310, 250pp., £37.50.     

Book reviews

Technology and Work in German Industry. N. Altmann, C. Köhler and P. Meil (Eds), London, Routledge, 1992, 466pp., £45 hb.

Retraining — Not Redundancy: Innovative Approaches to Industrial Restructuring in Germany and France. G. Bosch, Geneva, International Institute for Labour Studies, 1992, 183pp., 30 Swiss Francs pb.

Conflict in Urban Development. A. Dekker, H. Goverde, T. Markowski and M. Ptaszynska‐Woloczkowicz, Aldershot, Ashgate, 1992, 181pp.

The Global Region: Production, State Policies and Uneven Development. David Sadler, Oxford, Pergamon Press, 1992, 274pp.     

Late Postclassic lowland Maya archaeology

The archaeology of the Late Postclassic lowland Maya (ca. A.D. 1200–1517) is summarized and reviewed. The history of past research is outlined, and investigations on topics of major scholarly concern are discussed. The current data allow us to present an approximate reconstruction of the events and processes that characterize the period, although the information on many areas and topics is still fragmentary. Research in Maya archaeology has focused heavily on the more spectacular developments of earlier periods, creating the impression that the last few centuries of the prehispanic era were a time of disorganization and decline. New data and interpretations indicate that the Late Postclassic was a dynamic period in which the lowland Maya were moving in new directions, restructuring their society and worldview.     

THE EFFICIENT COMPUTATION OF UNBIASED MAHALANOBIS DISTANCES AND THEIR INTERPRETATION IN ARCHAEOMETRY*

This paper argues for cross-validation to reduce bias in estimating Mahalanobis distances of individuals to groups, a particular problem with small sample sizes. Formulae for the efficient computation of cross-validated distances, which avoid excessive matrix inversion, are given. The use of Mahalanobis distances as measures of consistency, or as indications of outlying values, is described. The little-known technique of gamma plotting is outlined and discussed as an aid to interpreting distances in these terms. Both cross-validation and gamma plotting are illustrated in an example on marble composition.     

A reconsideration of the West African macrolithic conundrum: new factory sites and an associated settlement in the Vallée du Serpent,Mali

Within West African prehistory, perhaps no period remains more mysterious than that between the Terminal Pleistocene and the mid-Holocene. This time period is shared by diverse macrolithic and microlithic industries. The macrolithic phenomenon has remained ill-defined, with most occurrences being generally lumped together as a single group, or attributed to earlier time periods. Recent archaeological investigations in the Vallée du Serpent and southern Gourma regions of Mali have revealed Holocene macrolithic assemblages quite different from the well-known bifacial traditions of Cap Manuel and Manianbougou, but not without parallels from elsewhere in the Sahel and Savanna. The most important of the Vallée du Serpent sites is that of Sirakoro-Ancien, where worked stone aggregations are associated with several rings of laterite cobbles believed to be the remnants of structures. Its lithic industry consists of massive flakes, perhaps removed directly from local outcrops, and smaller flakes from prepared cores as well as formal tools. Geomorphological and archaeological evidence suggests an age of the Vallée du Serpent sites somewhere between 9000 and 6000 bp. A new synthesis based upon sites investigated by the authors and the predominantly Francophone literature is presented in order to shed light upon this neglected portion of African prehistory.

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Résumé Dans toute la préhistoire de l'Afrique occidentale, aucune période ne reste peut-être plus mystérieuse que celle située entre la fin du Pléistocène et le milieu de l'Holocène. Diverses industries macrolithiques et microlithiques se partagent cette période. Le phénomène macrolithique reste mal défini, la plupart des exemples en sont généralement rassemblés en un seul groupe, ou attribués à des périodes antérieures. Des recherches archéologiques effectuées dans les régions de la vallée du Serpent et du sud du Gourma au Mali ont révélé des collections macrolithiques de l'Holocène bien différentes des traditions bifaciales bien connues de Cap Manuel et Manianbougou, mais non sans parallèles ailleurs dans le Sahel et la Savanne. Le plus important des sites de la vallée du Serpent est celui de SirakoroAncien où des agrégats de pierres travaillées sont associés à plusieurs cercles de galets en latérite que l'on pense être des restes de structures. Cette industrie lithique consiste en éclats massifs, peut-être retirés directement de couches géologiques locales, et en éclats plus petits provenant de nucleus préparés ainsi que des outils. Des preuves géomorphologiques et archéologiques suggèrent que les sites de la vallée du Serpent ont entre 9000 et 6000 ans. Une nouvelle synthèse, fondée sur les sites étudiés par les auteurs et des documents principalement en français, est présentée afin d'éclairer cette partie négligée de la préhistoire africaine.

     

Environmental Systems and Human Impact at Cobrico Crater,South-western Victoria

This study assesses human impact on the landscape around Cobrico, a volcanic crater lake in dairying country in south-western Victoria. It compares the last 150 years of impact of European settlement against approximately the previous 1500 years of prehistoric occupation and land use. Focus is on vegetation dynamics, erosion, productivity changes and the fire regime. Since European settlement there has been woodland clearance and recovery, the introduction of many plant and animal species and a significant increase in the intensity in the fire regime. While many direct linkages are apparent between environmental variables some operate over significant time lags. Fire has played a major role in vegetation dynamics and has favoured open ground taxa at the expense of Eucalyptus and Melaleuca. While major fires do not always lead to erosion in the catchment it is clear that some changes in the chemistry of erosion products have resulted, with potassium and iron showing increases in the historic period.