COMPUTER VISION‐BASED ORTHOPHOTO MAPPING OF COMPLEX ARCHAEOLOGICAL SITES: THE ANCIENT QUARRY OF PITARANHA (PORTUGAL–SPAIN)

Ancient quarries are intriguing archaeological sites, but their detailed recording is complex. This paper presents a cost‐effective approach to mapping of the Roman quarry site of Pitaranha (Portugal–Spain). First, aerial photographs were acquired using a radio‐controlled digital reflex camera attached to a Helikite, which allowed the acquisition of the necessary low‐altitude aerial footage in the very unstable wind conditions above the quarry. Using computer vision algorithms, the resulting set of photographs was semi‐automatically transformed into a Digital Surface Model (DSM) and a corresponding orthophotograph. Besides focusing on the acquisition and processing method, this paper evaluates the accuracy of the generated products. The orthophotograph proved to be satisfactorily accurate for 1:200 hard‐copy mapping.     

ELECTROCHEMISTRY AND AUTHENTICATION OF ARCHAEOLOGICAL LEAD USING VOLTAMMETRY OF MICROPARTICLES: APPLICATION TO THE TOSSAL DE SANT MIQUEL IBERIAN PLATE

An essentially non‐invasive electrochemical methodology addressed to the authentication of archaeological lead is described. The method is based on the record of the voltammetric response of nanosamples from the archaeological artefact mechanically transferred to a graphite ‘pencil’ electrode in contact with aqueous buffers. Three diagnostic criteria for authentication are described based on the appearance of: (i) oxidative dissolution signals for trace metals like copper, arsenic, antimony and, often, tin and silver accompanying stripping peaks for lead, (ii) peak potential shifts for reduction peaks for patination products, and (iii) the presence of reduction peaks for PbO₂. The method is applied to the authentication of an Iberian lead plate from the Tossal de Sant Miquel (Llíria, Spain) site using a series of genuine and false pieces from different provenances in the Valencian region (Spain).     

ORTHOIMAGE‐BASED DOCUMENTATION OF ARCHAEOLOGICAL STRUCTURES: THE CASE OF A MEDIAEVAL WALL IN PONTEVEDRA,SPAIN

During the completion of the expansion works at the Museum of Pontevedra (Spain), a stretch of about 60 m of the medieval walled enclosure surrounding the historic city centre was discovered. Due to its value as a heritage element, the discovery of this archaeological structure required the implementation of preservation activities and exhaustive documentation so that future generations will be able to know and enjoy this piece of history. This paper presents digital models that reproduce the original structure of the wall using close‐range digital photogrammetry, as well as orthophotos, which thoroughly document the dimensional and textural characteristics of the archaeological site. In addition to analysing the accuracy and validity of photogrammetry in the conservation of archaeological heritage, a methodology of data capture, processing and photogrammetry representation is evaluated.     

A STUDY OF OBSIDIAN SOURCE USAGE IN THE CENTRAL ANDES OF ARGENTINA AND CHILE

We present the results of XRF analysis for 428 obsidian samples from archaeological sites in the Argentinian province of Mendoza and from central Chile. The archaeological samples come from different environments and have dates that range from 9000 to 300 bp . The results indicate that all known sources were utilized; however, the beginnings and the intensities of their exploitation were variable. On the contrary, strong differences appear, especially between the Cordilleran and the non‐Cordillera sources. We suggest that this pattern is mainly related to differences in the accessibility, quality and abundance of the obsidian in the sources.     

TOWARDS REALISING THE FULL ARCHAEOENVIRONMENTAL POTENTIAL OF RAISED (OMBROTROPHIC) MIRES IN THE BRITISH ISLES

Summary. Raised mires represent a unique resource for the study of past peoples within their changing landscape context. However, present palaeoecological and archaeological approaches to these landscapes within the British Isles have followed largely separate agendas. Palaeoecological study has generally been focused on themes of climate change, using a range of techniques to derive information relating to changes in surface wetness of raised mires over time. In contrast, archaeological study has been broadly limited to themes of preservation and site recovery. This paper argues that the integration of the methods employed within both disciplines can enable an investigation of context unattainable for the majority of archaeological sites. A case study illustrates the recursive nature of human-environment relations in a raised mire system in Ireland.     

PHOSPHORUS ANALYSIS AT ARCHAEOLOGICAL SITES: AN OPTIMIZATION OF THE METHOD AND INTERPRETATION OF THE RESULTS

The application of phosphorus analysis to archaeological contexts can be considerably improved through ultrasonic extraction and the statistical evaluation of results through an analysis of variance. Such tools make the archaeological application of phosphorus analysis faster as well as more economical and coherent. This paper describes the features of these tools and provides a practical case: the Late Neolithic—Early Copper phase of the site ‘Polideportivo’in Martos, southern Spain.     

ASSESSING WHAT LIES BENEATH THE SPATIAL DISTRIBUTION OF A ZOOARCHAEOLOGICAL RECORD: THE USE OF GIS AND SPATIAL CORRELATIONS AT EL MIRÓN CAVE (SPAIN)*

Geographical Information Systems (GIS) are being incorporated into archaeology as a technique to improve the understanding of spatial organization and the relationships among finds within specific areas. Although their use as a basic tool in predicting the location of archaeological sites or in assessing the extent of their catchment areas is relatively common, in general, they have less often been applied to the study of the spatial distribution of archaeological remains within individual deposits, and in particular to faunal assemblages. Despite this, they can prove essential to understanding dispersion and grouping patterns within deposits fully, and, together with various correlation analytical techniques, they provide valuable information about the economic organization of settlements and inhabitant lifeways. To demonstrate the potential of this methodology, a zooarchaeological GIS has been prepared for the Middle and Late Magdalenian and Azilian layers in El Mirón Cave (eastern Cantabria, Spain), and the spatial distribution patterns of various attributes of the archaeological record have been analysed. Significant conclusions in terms of type and duration of human occupation have been drawn.     

STATISTICAL ASPECTS OF POTTERY QUANTIFICATION FOR THE DATING OF SOME ARCHAEOLOGICAL CONTEXTS*

This paper describes some statistical analyses of a particular archaeological material (pottery) originating at some sites in the city of Tours. An important part of the archaeological study of pottery is the comparison of ceramic assemblages to establish the absolute dates of contexts. In this paper, a statistical model is built to assess this comparison. The statistical procedure uses classical tools (correspondence analysis, linear regression and resampling methods) in an iterative scheme. Archaeologists may find in the paper a useful set of known statistical methods, while statisticians can learn a method of ‘arranging’ well‐known techniques. No method is new, but their combination is characteristic of this application.     

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 Romanı́ 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.     

THE WRITING'S IN THE WALL: A REVIEW OF NEW PRELIMINARY APPLICATIONS OF ELECTRICAL RESISTIVITY TOMOGRAPHY WITHIN ARCHAEOLOGY

Natural processes are known to cause significant damage to archaeological monuments. In fact, the key to understanding the decay of building materials is the internal movement of water through the mineral matrix, which influences the distribution of chemical, physical and biological deterioration processes. Electrical resistivity tomography (ERT) was traditionally used as a surveying tool within archaeology, but a new high‐resolution technique that accurately traces the movement of moisture in building materials could provide a vital tool for understanding the decay of many archaeological monuments. This paper considers current progress, the shift of ERT from soil to rock research and the impact that this development could have on future conservation, using Hertford College (Oxford) and Neolithic rock art (Golden Gate Reserve, South Africa) as case studies.     

THE INFLUENCE OF GEOLOGY ON THE MAGNETIC SUSCEPTIBILITY OF SOILS ON ARCHAEOLOGICAL SITES

A heating mechanism for the enhancement of the magnetic susceptibility of soils on archaeological sites is assumed. Data for the iron oxide concentration which is available for conversion to the strongly ferrimagnetic form is presented for soils derived from a wide range of geological strata. These data are then used, in conjunction with the concept of the fractional conversion of the iron oxide that has occurred as a result of fires associated with human habitation, to explain the wide range of soil susceptibilities observed on archaeological sites. The feasibility of employing magnetic surveying techniques for the location of buried features on archaeological sites, situated on the different geological strata, is then discussed.     

A computerized system to determine the provenance of finds in archaeological sites using acoustic signals

Some archaeological excavations require the accurate determination of the provenance of finds (three-dimensional location and orientation) for a subsequent spatial analysis. The traditional manual measurement using a grid reference is not a very efficient registration method. Some proposed computerized solutions based on total stations, photogrammetry and DGPS, are more effective but have some limitations. This paper presents a new acoustic localization system (3D-LOCUS) for measuring the three-dimensional position of finds in archaeological sites. The system can also be used for registering the size, shape and orientation of artifacts. 3D-LOCUS basically consists of a set of wireless rod-like pointing devices that are localized with a network of intelligent nodes installed above the excavation site. Archaeologists use the pointing device as a stylus to locate and outline the object under study. The main technological characteristics of the system are: omnidirectional wideband acoustic transducers, Bidirectional Time-Of-Arrival (BTOA) estimation, redundant ranging and robust trilateration. 3D-LOCUS achieves an accurate registration, even if used simultaneously to the digging labor, or in noisy or turbulent airflow conditions. We tested the system in the Gran Dolina archaeological site (Atapuerca, Spain). The typical location accuracy is below 10 mm in natural conditions, and the achieved resolution is 5 mm, which allows us sketching objects with enough detail.     

Morphometric and taphonomic analysis of granular ark (Anadara granosa) dominated shell deposits of Blue Mud Bay,northern Australia

Metrical analyses of complete mollusc shells have commonly been used to examine aspects of prehistoric mollusc demography, and by extension to investigate potential human exploitation of a variety of species. Recently it has been highlighted that several taphonomic processes, such as fragmentation, have the potential to introduce size bias into these archaeological samples, particularly towards smaller size classes, and thus the potential to significantly skew results of these metrical analyses. This is investigated here by deriving morphometric equations for the sand/mudflat bivalve Anadara granosa, a species prevalent in archaeological sites across northern Australia. A linear regression model based on a series of valve measurements, resulting in high coefficients of determination, demonstrates strong predictive power for size reconstruction. The effects of fragmentation on assemblages from two case study sites are then examined as a means of reviewing issues of differential size preservation, variation in mean valve size, and evaluating the strength of previous interpretations of intensive human exploitation in Blue Mud Bay. Based on these analyses it appears that A. granosa mean size is not significantly affected by fragmentation as other species described in the literature, and previous interpretations retain their validity.     

Technological Choices in Hand‐Made Indigenous Pottery from Western Mallorca (Balearic Islands,Spain) (C.1200–75 bc): An Archaeometric Approach

This paper addresses the technological choices observed in Mallorca (Spain) for the production of hand‐made pottery during the Late Bronze and Iron Age. We have conducted a diachronic analysis of the ceramic assemblages recovered from two archaeological sites placed in the same territory by means of X‐ray fluorescence and optical microscopy by thin‐section analysis. The archaeometric characterization of the hand‐made vessels allows us to establish several compositional groups related to the use of different raw materials and certain paste recipes associated with the archaeological sites and periods considered. Thus, this study evidences different productive strategies in each site and across time in the same geographical area.     

INSIGHTS FROM THE ANALYSIS OF ANGEL MOUNDS POTTERY TROWELS

Archaeologists have recovered pottery trowels in excavations at numerous historic and pre-Columbian archaeological sites in North America since the late nineteenth century. Despite these facts, pottery trowels have not been the subject of thorough scientific analysis or interpretation. In this study, I define and implement a new method of analysis for pottery trowels, using a sample of 188 pottery trowels from the Mississippian site of Angel Mounds (12VG1). After describing the quantitative and qualitative attributes of pottery trowels, I define categories of frequently occurring pottery trowel bell and handle types. The extensive variability of pottery trowel shapes and sizes discovered at Angel Mounds is then discussed with regard to alternative or multiple uses for the tools and the spatial and temporal distributions of pottery trowel types. As an artifact type that provides opportunities to analyze technology, craft production and specialization, and daily practices in past societies, I argue pottery trowels may hold important future insights into a number of topics of interest to archaeologists.     

BUTCHERING PATTERNS AND SPATIAL DISTRIBUTION OF FAUNAL ANIMAL REMAINS CONSUMED AT THE LOS MILLARES CHALCOLITHIC SETTLEMENT (SANTA FE DE MONDÚJAR,ALMERÍA,SPAIN)

The archaeological settlement of Los Millares (Santa Fe de Mondújar, Almería) is located in the Mediterranean coastal area of southern Spain. This archaeological site constitutes one of the most important settlements belonging to the Copper Age in the Iberian Peninsula and has given its name to the ‘millariense’ culture. The settlement has been completely excavated, yielding major archaeological faunal remains, with 27,426 bone fragments classified by researchers from Munich University (Germany). In this paper, we apply different statistical methods (mainly χ² analysis) to study the spatial distribution of bones from domestic and wild animals, reconstructing the patterns of appearance within specific functional spaces. These functions can be associated with meat consumption (sites to cut the animals into small pieces, areas where the meat was eaten, garbage sites, etc.) and the production of handmade objects (bone tools, stone tools, etc.). The results show different spatial distributions of faunal remains within the areas of the settlement, according to the animal species and particular parts of the animal skeleton, as well as the age and the sex of individuals. The findings reflect social behaviour that relates the consumption of certain species to a specific sector of population, and such behaviour can be discerned in the animal remains. Moreover, there is evidence regarding economic matters, such as meat production and the exchange of animals, which require further research.     

Destruction of microstructure in archaeological bone: a case study from Portugal

Sampling of archaeological human bone may not be justified, contrary to former high expectations regarding adult age assessment based on histomorphometry. The alterations in buried bone as a result of bacterial action are readily visible in the scanning electron microscope (SEM). An understanding of the chemical and structural changes to cortical bone requires work at the level of a few microns. This paper reports on problems encountered during analyses of samples of human bone from Mesolithic (ca. 8000 calbp) shell midden sites at Muge in central Portugal, and the methods used to try and overcome these problems. We believe we have shown that these Mesolithic bones are partly comprised of bacterially reprecipitated mineral, which has had collagen removed, with consequent obliteration of bone microstructure. We conclude that microbial destruction of the structure of archaeological bone can be a serious impediment to analysis of the characteristics of the population represented by those skeletal remains. Copyright © 2001 John Wiley & Sons, Ltd.     

Archaeological and archaeomagnetic dating at a site from the ager Tarraconensis (Tarragona,Spain): El Vila-sec Roman pottery

A very accurate archaeological dating of a Roman site in NE Spain (El Vila-sec) was made based on the typology of pottery artifacts. Three different phases were identified with activity ranging from the mid-1st century BC to the early-3rd century AD. Analyses of bricks from kilns at El Vila-sec produced data on their stored archaeomagnetic vector. These data were compared with the secular variation curve for the Iberian Peninsula and the SCHA.DIF.3K regional archaeomagnetic model. Both, the reference curve and the model, produced probability distributions for the final period of use for two kilns from the second archaeological phase that were not used during the third phase. At a 95% confidence level, both time distributions cover a wide chronological range including the presumed archaeological age. Both the Iberian secular variation curve and the SCHA.DIF.3K regional model proved to be suitable models for dating the site, although on their own they do not produce a single unambiguous solution. This archaeomagnetic approach could also be applied to neighbouring archaeological sites that have an imprecise archaeological age.     

Method for photogrammetric surveying of archaeological sites with light aerial platforms

In this paper, we describe a complete methodology for performing photogrammetric surveying of archaeological sites using light aerial platforms or unmanned aerial vehicle (UAV) systems. Traditionally, the main problem with using these platforms is the irregular geometry of the photographs obtained. These irregular image block patterns are occasioned by uncontrolled circumstances (e. g. effect of wind, lack of flight control, etc.) which generate high imprecision in the positioning of camera stations. The method proposed here allows the execution of the photogrammetric flight following the predicted parameters determined in mission planning (camera focal length, photo scale, ground sample distance -GSD-, overlaps, etc.) so we can obtain regular flight geometries. Our method allows the use of conventional photogrammetric data reduction methods based on the use of stereoscopic photogrammetric workstations. Although flights with irregular patterns can allow the formation of stereo pairs within certain limits, conventional photogrammetric procedures often have great difficulty in processing these irregular image blocks. For this reason this system raises the staking out of the camera positions by using a robotized total station and a mini prism situated on the platform. This method is applied to a real photogrammetric survey of an archaeological site of the Tartessic epoch in Southern Spain. The results obtained, confirmed by a quality control of the photogrammetric flight, have demonstrated the viability of this methodology even when moderate wind effects appear.