Ceramic Technology of the <Emphasis Type="Italic">Asurini do Xingu,Brazil</Emphasis>: An Ethnoarchaeological Study of Artifact Variability

This article presents some of the results of ethnoarchaeological research on ceramic technology I have conducted among the Asurini do Xingu, an Amazonian indigenous population inhabiting a village in the margins of the Xingu River, Pará, Brazil. Based on collected data, presented throughout the article, I discuss the reasons behind the formal, quantitative, spatial and relational variability of the Asurini ceramic vessels. This work will demonstrate that these distinct dimensions of variability are related to the potters’ technological choices during the vessels’ production process, the ceramic teaching-learning structure, and the type, frequency, method and context of use of the same vessels. I try to make clear the different practical and symbolic aspects that may influence the production, use, reuse, storage and discard processes of the vessels. Furthermore, I compare the Asurini context with other ethnographic contexts and try to distinguish regularities that may serve as interpretative references to the study of archaeological ceramic assemblages.

A new method for identifying sherd refits: A case study from the Neolithic of Northumbria,U.K.

Abstract

Here we present a flexible, quantitative methodology for refitting handmade ceramics. Rather than analyzing the physical joins between sherds, we assess the likelihood that non-adjoining sherds of similar appearance are from the same vessel. The customary disregard of non-adjoining sherds in refitting experiments prompts us to address this issue. Using the Neolithic ceramic assemblage from Thirlings (Northumberland, U.K.) as a case study, we test several scoring systems for assessing the probability of two sherds pertaining to the same vessel. The utility of this approach is supported by the comparison of a set of percentage scores statistically verified using Spearman’s rank correlation coefficient. We conclude with a discussion of the contribution of the new method to post-excavation ceramic analyses, and its applicability to other assemblages.     

Defining the provenance of red slipped pottery from Texas and Oklahoma by petrographic methods

Ceramics are among the most important artifacts that archaeologists use to reconstruct patterns of prehistoric trade and exchange. Petrographic analysis of ceramic thin-sections, in addition to providing detailed technological data, enables the identification of sand-tempering agents. These raw materials are potentially important evidence for ceramic provenance, assuming that such common materials themselves would not have been traded. Here we apply methods developed by sedimentary petrographers to the problem of determining the provenance of Red Slipped sherds from late Prehistoric (c. AD 1000–1400) sites in the Caddoan area and contemporaneous Plains Village sites. Modal frequencies of different kinds of quartz, feldspars and lithic grains are used to construct several triangular graphs that reveal compositional patterns indicative of provenance. Sherds from the Plains Village sites exhibit higher frequencies of lithic grains, feldspars and polycrystalline quartz relative to the sherds from sites in eastern Texas and eastern Oklahoma. While anomalous sherds were identified, the longstanding assumption that Red Slipped sherds in Plains Village contexts were traded from the Caddoan area is not supported by these data. These methods have strong application potentials for other, geologically diverse portions of North America.     

Transcending the “Obnoxious Spectator”: a case for processual pluralism in ethnoarchaeology

Several commentators have argued that ethnoarchaeology will only become a productive part of archaeological research once both archaeology and ethnoarchaeology are unified by the axioms of a single theory of behavior. Through an examination of the different roles that ethnoarchaeological research has adopted, I demonstrate that ethnoarchaeology is already theoretically unified by a general concern with analogy. I argue that the problems that many commentators have recognized with ethnoarchaeology’s apparent eclecticism arise from an over-reliance on “core universals” by both processual and postprocessual researchers. Instead of implementing a single unified theory of behavior, I suggest that ethnoarchaeologists should adopt a pluralistic orientation that is sensitive to the contextual applicability of specific causal processes.     

The Definition of Spatial Units in Middle Palaeolithic Sites: The Hearth-Related Assemblages

This paper deals with hearth-related accumulations in Middle Palaeolithic sites. Spatial behaviour is a key to understanding the cultural capabilities of ancient hominids. Ethnoarchaeological and archaeological research has shown that hearth-related assemblages are a basic feature in the spatial behaviour of modern and prehistoric hunter–gatherers. In this paper, we propose a methodology for analysing archaeological accumulations and study a series of hearth-related assemblages from the Abric Romanı&#x0301; Middle Palaeolithic site (Capellades, Spain). We also analyse the degree of contemporaneity between the different activity episodes documented at each archaeological accumulation. Our results suggest that the characteristics of domestic areas in this site are not substantially different from those observed in ethnoarchaeological contexts and Upper Palaeolithic sites.     

Chemical characterization of ancient pottery from sudan by x‐ray fluorescence spectrometry (xrf), electron microprobe analyses (empa) and inductively coupled plasma mass spectrometry (ICP–MS)*

Sixty‐four sherds and seven natural clays from prehistoric sites in northwestern Sudan have been submitted to petrological and chemical analysis using XRF spectrometry, EMPA and ICP–MS. According to their texture, the sherds form five different groups. The high contents of P₂O₅ (more than 0.5 wt%) discerned in 19 samples and the variation of the P₂O₅ content in two samples of the same vessel can be explained by post‐depositional processes or by the ancient organic contents (e.g., milk) of the vessel. Chemical classification of the pottery bulk suggests that vessels were made locally, as only sherds from the same area show homogeneity of data.     

TIME‐OF‐FLIGHT NEUTRON DIFFRACTION CHARACTERIZATION OF CERAMIC FINDINGS FROM SOUTHERN AND WESTERN SICILY*

We present the results of a study that is part of a wider research programme regarding knowledge of the initial living phases of Sicilian agricultural and pastoral society. Three sets of ceramic samples were analysed through time‐of‐flight neutron diffraction (TOF‐ND) to derive information about the composition of the clay and the manufacturing techniques. The first two sets of sherds came from an excavation in Licata, close to Agrigento, and are composed of findings dated around the third century bc , while the third set was of samples from prehistoric sites located in the northwestern part of Sicily. Measurements were performed to obtain a quantitative identification of the mineralogical composition of the samples in a totally non‐destructive way. Hints about manufacturing techniques and firing temperatures are derived to provide information on provenance and production processes of the objects.     

A COMPARISON OF INDUCTIVELY-COUPLED PLASMA EMISSION SPECTROMETRY AND ATOMIC ABSORPTION SPECTROMETRY ANALYSIS ON STANDARD REFERENCE SILICATE MATERIALS AND CERAMICS

Analyses by inductively coupled plasma atomic emission spectrometry and atomic absorption spectrometry of 22 ceramic standards and sherds are compared. Further data from analyses of one of the ceramic standards analysed by both methods are also discussed. The results show that for most major elements, the methods are comparable, but that use of common standards would be advisable if data from the two methods are to be compared.     

Small prey hunting technology and zooarchaeological measures of taxonomic diversity and abundance: Ethnoarchaeological evidence from Central African forest foragers

Archaeological analyses of faunal assemblages often rely on rationale derived from the prey choice model to explain temporal and spatial changes in taxonomic measures of diversity and/or abundances. In this paper, we present analyses of ethnoarchaeological observations and bone assemblages created by Central African Bofi and Aka forest foragers which show that different small prey hunting technologies target specific suites of prey and that hunters vary their technological choice depending on their foraging goals. Analysis of ethnoarchaeological bone assemblages produced by the Bofi and Aka shows that variability in target prey can create spatially distinct, but contemporaneous, faunal assemblages with different diversity values and abundance indices. These data reveal important variation in how individuals within a contemporary human population rank prey and challenge current assumptions about the meaning of diversity and abundances measures in archaeological contexts. We argue that the use of diversity and abundance indices can obscure important intrasite variability in prehistoric foraging effort and suggest strategies that might enhance current techniques.     

Post-depositional surface whitening of ceramic artifacts: alteration mechanisms and consequences

Surfaces on ceramic artifacts that are paler than the main sherd body are commonly interpreted as slips that were intentionally applied by the potter during the manufacturing process. However, due to post-depositional alteration, sherds that were not originally coated with a slip may macroscopically appear with deceptively similar pale surfaces. This paper presents a comparison of two sherds, both with pale to white surfaces, one of which is a real slip and the other a surficial corrosion that occurred during the burial stage. Observations using optical and scanning electron microscopy, as well as electron-probe image- and microanalysis, clearly illustrate the features of the two surfaces, as well as demonstrating their causes and effects. The superimposed slip is clearly delimited from the sherd body by a denser and much finer-grained fabric, in which clay minerals predominate and porosity is reduced by about 20% compared to the body. In the other sample, surface corrosion, due to invading fluids, has led to leaching of calcareous constituents and results in a remarkable increase in porosity close to the rim (ca. 25%). Sometimes called the “espresso crema effect” (Tschegg et al., 2009b), the surface becomes considerably brighter than the core and can easily be confused with intentional slips. This, as a consequence can lead to significant misinterpretations, to erroneous sherd characterizations and classifications, as well as to incorrect assignments to specific ware groups.     

THE DATING OF ANCIENT CHINESE CELADON BY INAA AND PATTERN RECOGNITION METHODS*

In 2005, sherds of a special type of ancient Longquan celadon ware were excavated at Maojiawan, in the city of Beijing, China. Although archaeologists agree that these sherds were fired in the period between the Yuan and Ming Dynasties, their specific date is unclear. In order to solve this problem, five other groups of ancient Longquan celadon sherds of known date were selected as reference samples. The elemental body composition of all the sherds was determined by Instrumental Neutron Activation Analysis (INAA). Using the same principles as in provenance research, pattern recognition methods were used to build classification functions to specify the date of the unknown sherds. After analysing the experimental data by discriminant analysis, three classification functions were built. All the unknown sherds were classified as Ming Dynasty. This prediction is well in accordance with the fact that these sherds are similar to other Longquan Ming celadon, and so they should be fired in the same dynasty. This also verified the judgement of the Beijing Institute of Cultural Relics.     

Non-destructive chemical characterization of ceramic sherds from Shipwreck 31CR314 and Brunswick Town, North Carolina

The purpose of this study was to chemically and texturally characterize ceramic oil jar sherds from North Carolina Shipwreck 31CR314 and to explore the utility of environmental scanning electron microscopy/X-ray energy dispersive spectrometry (SEM/EDS) for that purpose. The oil jar sherds, widely dispersed about Shipwreck 31CR314, are morphologically similar to each other, which suggests they could be from a single jar, but with so few joins this could not be concluded with certainty. Therefore, an aim of this study was to investigate whether chemical or textural characterization of the sherds might reveal unique attributes that could distinguish individual jars; results of characterization perhaps could give information on their origin and possibly site formation processes, such as whether environmental forces could have scattered sherds of a single jar during and after sinking of the ship. Previous studies have indicated this shipwreck is likely the remnants of the Queen Anne's Revenge, flagship of the pirate Blackbeard. Sherds from this shipwreck were compared with similar oil jar sherds excavated from a land site, Brunswick Town, North Carolina, to explore the use of composition and texture as hallmarks. The chemical components of the artifacts were determined by SEM/EDS. This method of analysis is valuable for archaeological research because it is rapid and non-destructive to the ceramic artifacts. Both groups of lead-glazed coarse red earthenware sherds were texturally similar except for the glazed sides of all 31CR314 sherds that exhibited small tracks of unique crescent-shaped marks. These marks may be due to manufacturing effects and immersion in seawater, and the marks may serve as hallmarks for individual jars or potentially individual manufacturers. The sherds were generally similar in composition, but the two groups exhibited distinct differences. Brunswick Town sherds consistently contained more phosphate on unglazed sides, an average 1.46 wt.% P₂O₅, and also contained trace elements not detected in the Shipwreck 31CR314 sherds. These distinct differences could be due to different manufacturing origins for Shipwreck 31CR314 and Brunswick Town ceramics but also could reflect their subjection to different environments during use and loss prior to archaeological recovery.     

FOCUS: The Scapula Representation could be the Key: A Further Contribution to the ‘Klasies Pattern’ Debate

Past discussion on the unusual skeletal part representations at Klasies River Mouth is briefly summarized. Recent discussion in this journal, regarding the “Klasies Pattern”, has focused upon the differential destruction of small and large bovid bone epiphyses by carnivore ravaging and density-mediated attrition. Bartram & Marean (1999) argue, from ethnoarchaeological study and consideration of other archaeological sites, that, unless shaft fragments are painstakingly identified, the upper limb bone epiphyses of large bovids will be seriously under-represented. They therefore suggest that the “Klasies Pattern” is likely to be artefact of taphonomic and analytical processes. Klein, Cruz-Uribe & Milo (1999) replied with a defence of the analytical procedures employed during the original Klasies River Mouth analysis. They also state that there was very little evidence of carnivore ravaging at Klasies River Mouth. In this paper, it is pointed out that Bartram & Marean's (1999) study only considered the humerus, radius, femur, tibia and metapodia. However, in the “Klasies Pattern” it is the scapula that is most notably abundant in the small bovid classes and most notably scarce in the large bovid classes. It is argued that, from the study of bone mineral densities and Brain's (1981) carnivore ravaging experiment, there is no reason to expect a differentially greater taphonomic destruction of large bovid scapulae. In fact, exactly the reverse may be true. It is therefore argued that at least this aspect of the “Klasies Pattern” must be considered to represent human differential bone transport, rather than an artefact of taphonomic processes.     

Estimating parent population of pottery vessels from a sample of fragments: a case study from inter-tidal surface collections,Roviana Lagoon,Solomon Islands

Archaeologists frequently interpret the duration and type of prehistoric occupation at a location/site from the relative abundance of prehistoric materials (accumulations research). Taphonomic factors have the potential to alter substantially the archaeological record leading to inaccurate assumptions about the nature of prehistoric settlement. Where vessel families of potsherds can be established, we provide a general method to estimate the parent population from which the sample of sherds derives, through analysis of vessel completeness of the sample. This provides a basis for archaeological interpretation of the scale of discard represented at a location. The approach used has broad applicability to many archaeological settings where behavioural inferences are made from poorly preserved ceramic samples. Statistical analysis of a ceramic assemblage from Roviana Lagoon stilt villages indicates that most of the ceramic assemblage has been destroyed over time. An unexpectedly severe taphonomic regime is inferred for this relatively sheltered landlocked lagoon setting. Rather than marking an ephemeral occupation, estimating a parent ceramic population indicates instead that early stilt village sites in the Solomon Islands region were probably permanently occupied for several centuries. Results also suggest that the relative absence of recorded Lapita sites in the main Solomon Islands, and possibly elsewhere in Near Oceania may be a result of a harsh taphonomic regime for the remains of stilt village occupation.     

PINE RESINS AND POTTERY SEALING: ANALYSIS OF ABSORBED AND VISIBLE POTTERY RESIDUES FROM CENTRAL NEW YORK STATE*

Analysis was performed on absorbed and visible residues from 21 New York State prehistoric pottery sherds dating from 2905 ± 35 bp (Intcal04) (1256–998 cal bc ) to 425 ± 40 bp (Intcal04) (1417–1626 cal ad ). The use of pine resin was detected in 10 of 12 absorbed residue samples and 11 of 17 sherds subjected to visible residue analysis. It seems likely that the pots were resin‐sealed to make them more impermeable, constituting the first chemical evidence of extensive resin‐sealing in North America. A comparison of the results of absorbed and visible residues from eight of the sherds indicates that the two kinds of residue provide complementary evidence of vessel use.     

“Random” hunting and the composition of faunal samples from archaeological excavations: A modern example from New Zealand

The ability of analyses of the age- and sex-composition of faunal samples from archaeological excavations to permit reliable inferences concerning prehistoric culling practices and, in particular, to distinguish between wild and domesticated animals is investigated by examining the demographic composition of 14 groups of red deer (Cervus elaphus) shot at random from a helicopter in the Southern Alps of New Zealand in early 1975. It is concluded that such “random” hunting can produce samples of bones that are apparently biased with respect to age and/or sex. The implications of these findings for prehistoric studies are discussed briefly with particular reference to the exploitation of red deer in Italy and Switzerland, and greater caution in excavating and analysing faunal samples is urged.     

A MICRO‐RAMAN AND INTERNAL MICROSTRATIGRAPHIC STUDY OF CERAMIC SHERDS FROM THE KILNS OF THE MEDICI CASTLE AT CAFAGGIOLO*

Nine representative sherds from the old (14th–16th century) kilns at the Castle of Cafaggiolo in Tuscany have been analysed by means of internal microstratigraphic analyses and micro‐Raman spectroscopy and classified as follows: six engobed and glazed fragments, of which three are covered with an opaque white, decorated layer, one is marbleized, and two are engobed. The surface of the two engobed sherds, fragments of unfinished products, indicates that at least two firing processes were used. Two samples show characteristics of Byzantine pottery, and three of them can be classified as Islamic ware or maiolica, whilst the other one displays intermediate characteristics. The variety of ceramic wares indicates the presence of craftsmen with differing expertise, and suggests that part of their work was dedicated to experimentation on new ceramic production techniques.     

Detecting Apprentices and Innovators in the Archaeological Record: The Shell Bead-Making Industry of the Channel Islands

Archaeologists have demonstrated that it is challenging but feasible to identify the material remains of apprenticing activities associated with stone tool and ceramic assemblages. Building on this work, I explore apprenticing behavior in North America??s most intensive ancient shellworking context, using the large bead-making assemblages from California's Channel Islands. I examine a spectrum of production errors associated with a newly identified variant of Olivella shell bead and offer generalizations about what we should find in the material record of apprentices engaged in manufacturing ornamental goods. I also explore how we may distinguish novices?? errors from the mistakes of skilled experts experimenting with new bead forms. Existing ethnoarchaeological studies of children??s roles and contemporary craft practitioners specializing in ceramics, bead making, stone work, and other materials are foundational sources of data for this project, providing insights into the transmission of technical information from experts to novices in communities of practice. Such work directly informs archaeological research and facilitates our understanding of apprenticing from periods and regions where ethnographic information is insufficient or inapplicable.     

Interpreting Intra-site Spatial Patterns in Seasonal Contexts: an Ethnoarchaeological Case Study from the Western Alps

This paper deals with the ethnoarchaeological analysis of the spatial pattern of artefacts and ecofacts within two traditional pastoral huts (a dwelling and a seasonal dairy) in the uplands of Val Maudagna (Cuneo province, Italian western Alps). The composition of the ethnoarchaeological assemblages of the two huts was studied and compared; point pattern analysis was applied to identify spatial processes mirrored in the interactions between objects; Moran’s I correlogram and empirical variogram were used to investigate the effects of trampling on the displacement of objects on the floor. The results were compared with information provided by the herder who still used the huts. The quantitative and ethnographical data enabled inferences to be made that can help in the interpretation of archaeological seasonal sites. The function of a seasonal site can be recognized, as can the impact of delayed curation on the composition of the assemblage and the importance of the intensity of occupation compared with the frequency of occupation. The spatial organization of activities is reflected in the spatial patterns of objects, with clearer identification of activity areas in intensively occupied sites, and there is evidence for the behaviour behind the spatial segregation of activities. Trampling is a crucial post-depositional factor in the displacement of artefacts and ecofacts, especially in non-intensively exploited sites. From a methodological point of view, this research is another example that highlights the importance of integrating quantitative methods (especially spatial analysis and geostatistical methods) and ethnoarchaeological data in order to improve the interpretation of archaeological sites and assemblages.     

An experimental ethnoarchaeological approach to understanding the development of use wear associated with the processing of river cane for split-cane technology

Southeastern Indians have been using cane (Arundinaria spp.) for basketry and matting for thousands of years. Unfortunately, it is only under extraordinary preservation conditions that such items survive archaeologically. Inferring the production of split-cane technology requires an understanding of prehistoric manufacturing and processing techniques. It is hypothesized that stone tools were once used to process cane for use in split-cane technologies. In the Southeast, it is not uncommon to find stone tools with traces of plant use; however attributing wear to specific plants has been problematic. Pilot experiments, grounded on ethnoarchaeological observations, were conducted with river cane (Arundinaria gigantea) in collaboration with expert basket weavers in the Cherokee Nation. The experimental ethnoarchaeological program was designed to test the efficiency of stone tools in cane processing and document use wear through microscopic observations. The results found that non-retouched flakes were efficient for processing river cane and that the different stages of splint preparation resulted in the differential development of use-related wear. Additional experimentation with river cane is necessary to better define use wear and establish criteria for identification in archaeological contexts. Nonetheless, the collaborative and experimental approach undertaken demonstrated the utility of combining traditional archaeological methods with experimentation, ethnoarchaeology, and tribal knowledge.