NON-DESTRUCTIVE ANALYSIS OF OBSIDIAN ARTEFACTS USING NUCLEAR TECHNIQUES: INVESTIGATION OF PROVENANCE OF NEAR EASTERN ARTEFACTS

A non-destructive analytical method using both instrumental neutron activation and proton-induced gamma ray emission techniques was developed to study the provenance of obsidian artefacts from Turkey, Syria and Iraq.     

ANCESTOR ARTEFACTS – ANCESTOR MATERIALS

Ancestor artefacts (objects of an earlier period, valued for their age and associations, which are retained into a later period) are normally identified by archaeologists owing to the difference between the date of the object and its context. These valued artefacts often demonstrate evidence of veneration (collection, cleaning and care). Recently, the importance of fragments in referencing an earlier object and its associations has been recognized ( Chapman 2000 ), though the detection of such fragments, even when in significant contexts, presents a challenge to archaeologists. The first example of an ancestor object which no longer exists, even as fragments, but as remelted metal, is presented in this paper. This suggests that the material of which an artefact is composed may have significantly greater cultural meaning than previously proposed. Distinguishing such ancestor material from material recycled for economic benefit or its desirable physical characteristics presents a significant challenge to the archaeologist and archaeological scientist.     

THE SCIENTIFIC IDENTIFICATION OF ARCHAEOLOGICAL JET-LIKE ARTEFACTS

Jet has been widely used in the past for jewellery but was just one of a range of black lithic materials employed. When worked into small objects these materials can be visually indistinguishable, yet discrimination is important because of the restricted occurrence of jet. X-ray fluorescence (XRF) is a rapid non-destructive discriminatory technique, but not all samples are clearly classified, and inhomogeneity may pose problems. A reassessment of the use of XRF is reported. Other techniques considered include electron spin resonance, infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis, scanning electron microscopy and X-radiography. These were tested on geological materials to define an effective methodology for archaeological material. The recommended approach is a combination of XRF and X-radiography, although preliminary Fourier transform infrared results showed promise. The X-ray techniques were tested on Romano-British assemblages from Catterick and Stanwick.     

AN ASSEMBLAGE OF BRONZE ARTEFACTS FROM IVINGHOE, BUCKINGHAMSHIRE

Summary. An assemblage of 20 bronze artefacts discovered together is described, which includes 17 Late Bronze Age objects belonging to the Wilburton tradition (including one decorated sword hilt). The assemblage also includes three other objects, of later dates, and the separate discovery of a Wilburton sword, found nearby, is also described. The origin of the Wilburton items as part of a hoard is discussed and the likely history of the assemblage is considered. A metallurgical report on all the objects, by J.P. Northover is included.     

THE BEHAVIOUR OF ARTEFACTS AS SEDIMENTARY PARTICLES IN A FLUVIATILE ENVIRONMENT

Lower Palaeolithic artefacts are frequently contained in fluviatile deposits, and it follows that a consideration of the stream processes which resulted in their deposition and preservation is necessary in order to evaluate the archaeological significance of such ‘assemblages’. This note indicates some aspects of artefact taphonomy of particular importance, in the hope that it may stimulate a more empirical approach to the contextual study of implement groups.     

COINS,ARTEFACTS AND ISOTOPES—ARCHAEOMETALLURGY AND ARCHAEOMETRY*

Archaeometallurgy is one of the earliest manifestations of archaeometric research, using science‐based approaches to address cultural–historical questions. This review first outlines the extent of the field, defining in some detail the main branches of archaeometallurgy, and their specific methodological approaches. It then looks at some of the early publications pioneering archaeometallurgical research, to set the scene for the publication pattern of archaeometallurgy in general, and the role that Archaeometry played in publishing archaeometallurgical research. The analysis of archaeometallurgy‐themed publications in Archaeometry, their change over time and their relationship to the total range of work done in the field indicates that there is a rather narrowly defined and specific type of archaeometallurgy that gets published in Archaeometry, initially with a strong focus on coin and object analysis, often combined with method developments. The more recent developments in isotope‐based studies in archaeometallurgy find only a limited representation in the journal, despite the leading role that the Isotrace Laboratory played in this discipline, for some considerable length of time. More recently, this Archaeometry‐specific ‘flavour’ of archaeometallurgy seems to weaken, with an increase of papers on iron and on primary production in general, subjects still much under‐represented.     

MATTER(S) OF INTEREST: ARTEFACTS, SPACING AND TIMING

This paper argues that time‐geography can make a contribution to contemporary ‘rematerialized’ geographies, because the interconnections among social processes, human corporeality and inanimate material artefacts within the landscape were among Hägerstrand's central concerns. Time‐geography needs none the less to be extended in several ways to make it more reconcilable with current thinking about materiality in geography. The possibility of combining Hägerstrand's framework with notions from (post) actor‐network approaches is therefore explored. It is suggested that concepts and notions from the latter may contribute to the advancement of the conceptualization of action at a distance and agency in general in time‐geography, as well as the incorporation of the immaterial realm into space—time diagrams. The resulting materially heterogeneous time‐geography is a framework for studying the spacing and timing of different material entities that is sensitive to the role of artefacts and their local connectedness with other material forms. Some of its elements are illustrated briefly through an empirical study of the roles played by a few mundane artefacts in working parents ‘coping with child‐care responsibilities on working days. The case study suggest that these artefacts not only enable goal fulfilment and routinization but also result in further spacing and timing practices, and can introduce uncertainty and novelty to existing orders.     

METALLOGRAPHIC STUDY OF IRON ARTEFACTS FROM THE EASTERN TRANSVAAL,SOUTH AFRICA

The microstructures of two adzes, two hoes and a spear point from Iron Age settlement sites in the Kruger National Park have been examined. Electron microprobe analyses of the slag inclusions were also made. Some of the objects are made of high carbon steel while others have a highly variable carbon content. All appear to have been forged at relatively low temperature and then annealed at a low temperature near 700°C. None have been hardened by quenching and tempering. Some of the objects contain only traces of included slag while others have large slag inclusions. The slag compositions are quite different from those of medieval bloomery slags and are representative of African iron smelting practice in their high content of CaO, K₂ O and Na₂O. On the basis of the titanium content of the included slag, two of the objects are identified as made of the ore from Rooiwater and one from Phalaborwa ore.     

URANIUM‐SERIES AND LUMINESCENCE DATING OF VOLCANIC LITHIC ARTEFACTS*

U‐series dating was used to determine the growth rate of a feldspar‐to‐clay weathering rind in a mid‐Holocene Cascade–Olcott tradition andesite core, and luminescence dating (last exposure to sunlight) was used to date fine‐grained feldspars scraped from the surfaces of similar buried artefacts from a ¹⁴C‐sediment‐dated archaeological site (45KI464) on the wet western slope of the Cascade Mountains of Washington. For U‐series dating, we measured ²²⁶Ra excess (²²⁶Ra excess =²²⁶Ra –²³⁰Th) in five stratigraphic depth controlled rind scrapings. ²³⁸U, ²³²Th and ²³⁰Th were counted by alpha spectrometry, and ²²⁶Ra and ²¹⁰Pb were counted by gamma spectrometry on each sub‐sample.     

ON THE COMPOSITION AND PROVENANCE OF METAL ARTEFACTS FROM POLIOCHNI ON LEMNOS

Summary. The majority of the well-stratified Early Bronze Age metal objects from Poliochni, with the exclusion of one hoard find, was analyzed for their chemical and lead isotope composition. The results show that a major change occurred in the metal used at Poliochni during periods contemporary with Troy I and Troy II. Unalloyed or arsenical copper with relatively high lead contents during the earliest two periods 'azzurro' and 'verde' is gradually replaced and supplemented by tin bronze which, during period 'giallo', i.e., by the end of Troy II, becomes the dominant metal type. Lead isotope abundance ratios in the earlier artefacts are consistent with a derivation of the metal from regional ore sources but the trace element abundance pattern is not. Concurrent with the appearance of tin bronzes is an increase in the diversity of ore deposits exploited; for about one third of the artefacts from period 'giallo' there is as yet no matching ore source in all Anatolia and the Eastern Mediterranean. It is argued that the tin bronzes have been imported as such but that the lead isotope signature does not provide any direct clues to the origin of the tin.