Cluster analysis of mixed-level data: Pottery provenience as an example

Provenience or “sourcing” studies of archaeological objects most commonly employ quantitative measurements of amounts of chemical constituents in the artifacts and source materials. These are then used in statistical grouping procedures known as cluster analyses. Many additional attributes of artifacts and sources, yielding lower-level qualitative data, are also of potential importance in determinations of artifact origins. These attributes are usually neglected because of the longstanding difficulty in treating “mixed-level” data, that is, combining both qualitative observations and quantitative information in a single powerful statistical procedure. A series of cluster analyses were run on two data sets consisting of archaeological pottery, using mixed-level characterization data in the CLUSTAN program with Gower's coefficient of similarity. The clustering solutions are interpretable in terms of provenience and production strategies.     

Al-Khidr site on Failaka Island in the Bronze Age: Pottery perspective

The objective of this article is to evaluate the results of the excavation at the site of Al-Khidr on Failaka Island that was probably a port or a fishermen’s settlement in the past. A very large number of stone architectural remains and artifacts have been discovered there. Al-Khidr is a typical Dilmun culture site and the settlement was probably contemporary with the known sites F3 and F6 located on the south-west coast of the island. Based on the pottery that has been processed, we preliminarily dated the site to a period between the beginning of the second millenium and approximately 1500 BC, although older settlement may have occurred, beginning at the end of the third millennium.     

Ceramic Technology And Resource Use During The Early Neolithic In Central‐Southern Portugal

Petrographic analysis of 49 sediments and 63 Neolithic ceramics from eight sites of Estremadura and six sites of the Algarve of central and southern Portugal, respectively, discerned distinct production technologies for each area. Raw materials available near archaeological sites were utilized. Fabrics that do not correspond to regionally available materials, however, indicate imports or migration. This suggests the existence of bidirectional maritime routes rather than south–north only, as predicted in current models of the neolithization of coastal Portugal. Seven ceramics and seven sediments were selected for elemental analysis. The results supported the patterns in the petrographic analysis.     

The Turnover Club: locality and identity in the North Staffordshire practice of turning over ceramic ware

This paper explores a key practice adopted by those local to or from Stoke-on-Trent, and outlines its significance in the wider context of ‘ordinary’ consumption and material cultures, globalisation and local identity. Being a ‘turnover-er’ – someone who always turns over pottery to check whether it is Stoke-on-Trent ware – is an oft practised, but little examined part of the living heritage that connects those with affinity to ‘the Potteries’ (as the region is known) and its ceramic ware. The project set out to explore qualitative accounts of turning over and to gauge its salience and reach as a practice, linking this to broader accounts of material culture, consumption and heritage. We carried out 20 interviews with those who turn over or who have an interest in local ceramics, and an online survey (n = 500) which explored the some of the reasons for turning over. Findings indicate the strong connections established by the practice of turning over to local identity, both inherited and adopted, and further indicates the social salience and emotional attachments to the meanings of local ware.     

From Pottery to Politics: An Ethnoarchaeological Study of Political Factionalism, Ethnicity, and Domestic Pottery Style in the Ecuadorian Amazon

A long-standing assumption in archaeological theory is that pottery in the domestic context represents a form of passive style that does not enter into symbolic communication in the political domain. This paper presents ethnoarchaeological data to establish a link between women's active political behavior and pottery style in the domestic context in a small-scale, segmental society in the Ecuadorian Amazon. Analysis of individual variables of style shows that Achuar and Quichua women signify their political alliances in the painted decoration of their domestic pottery more strongly than they signify so-called passive processes of learning associated with early enculturation and ethnicity. Furthermore, analysis of women's judgments of pottery as Achuar or Quichua indicates that they decode cues to political alliances in the pottery of other women, including cues to political differences within and between groups. The theoretical implications of these findings are discussed in terms of the principles underlying women's stylistic behavior as part of the political processes involved in the construction and maintenance of social identity and social boundaries.     

A characterisation study of Ubaid period ceramics from As-Sabbiya,Kuwait, using a non-destructive portable X-Ray fluorescence (pXRF) spectrometer and petrographic analyses

The Ubaid cultural phenomena (6500–4200 BC) of southern Mesopotamia has been used to characterise other archaeological sites in the Arabian Gulf region. The aim of this inquiry is to explore the nature of the interaction between the homeland of the Ubaid and the wider Gulf region. Through the use of a non-destructive portable X-ray fluorescence (pXRF) spectrometer, this study seeks to characterise and identify the chemical and mineralogical compositions of the ceramic assemblage from the Bahra 1 site of the As-Sabbiya region, Kuwait. The chemical results demonstrated that a combination of six trace elements [rubidium (Rb), strontium (Sr), yttrium (Y), zirconium (Zr), niobium (Nb) and barium (Ba)] occur significantly enough to delineate clay-based artifact groups—local red coarse from Ubaid, while the mineralogical analysis confirms the pXRF result and identifies the source of the raw materials and temper as well. Also, the comparison between the Ubaid and Bronze Age assemblage results suggests that potters used different clay resources within their own regions and/or production techniques.     

Archaeometric investigation of pottery from funerary gifts in Kal-e Chendar,Shami (Khuzestan,Iran)

Thirty fragments of red slip, glazed, common and cooking ware from Hellenistic and Parthian tombs at Kal-e Chendar in Shami (Iran) were investigated. Petrographic assemblage and chemometric evaluation of chemical data collected most samples in a large cluster, suggesting a common provenance, even in a quite wide area which includes Izeh plain and lowland Susiana, and underlining the presence of smaller very distinguished groupings. Surface finishing layers (both glazes and red slips) showed a high degree of alteration of their morphological features. Blue glazes are typical plant-ash, with copper as a colouring agent.     

Application of electron microprobe analysis to identify the origin of ancient pottery production from the Castillo de Huarmey,Peru

A vast amount of ceramics (among other grave goods) were recovered from Castillo de Huarmey, a Wari culture (650–1050 ce ) archaeological site on the north coast of Peru. In order to assess ceramic production area(s) and possible trade, political or cultural interactions with other regions, and to complement earlier petrographic analysis, electron microprobe analysis (EMPA) was conducted following a rarely used methodology in archaeology. The chemical composition of individual minerals in ceramics and sediments samples from the Huarmey Valley was obtained, focusing mainly on amphiboles, feldspars and pyroxenes. The results of the analyses clearly indicate that the majority of the ceramic analysed was made of raw material of local origin.