PROVENANCING AND ARCHAEOLOGY OF ROMAN MILLSTONES FROM SARDINIA (ITALY)

Summary. Sardinia was an important Roman settlement and trade centre between 238 BC–500 AD and is an ideal site for study of Roman trade. Study of Roman millstones in Sardinia shows that the commonest type is the Pompeian (hour-glass) mill (forty-eight stones studied), with smaller numbers of cylindrical hand querns (sixteen stones studied). Most of these millstones are composed of igneous rocks which include grey vesicular lavas of basic/intermediate composition and a distinctive reddish rhyolitic ignimbrite. There is historical and archaeological evidence for millstone manufacture at six localities in Sardinia. Visual and petrographic study and X-ray fluorescence analysis for major and trace elements of seventeen millstone samples, and fifty rock samples from potential source areas have been used to provenance the igneous rock millstones. The grey vesicular lava millstones have varied sources within the Tertiary-Recent volcanic rocks of Sardinia, while the millstones composed of rhyolitic ignimbrite are from a single source of Tertiary ignimbrite at Mulargia (central west Sardinia). A single hand mill from the north of Sardinia was imported probably from Agde in southern France, and is the only sample composed of non-local rock. Mulargia millstones were widely traded within the western Mediterranean and show a rapid decrease in frequency of occurrence with increasing distance from the source. Sardinia was therefore an important centre of Roman millstone production and a source of millstone trade during the period of Roman settlement.     

Mediterranean trade of the most widespread Roman volcanic millstones from Italy and petrochemical markers of their raw materials

The petrochemical study of millstones can contribute to improve the archaeological research into reconstruction of ancient communication routes and trade networks. Volcanic rocks are geographically restricted and rather rare in the Mediterranean regions, and during the Roman period Italian volcanoes were important sources of raw materials for millstones, so the task of determining their geological origin is relatively straightforward. The Italian vesicular volcanics most frequently employed for this purpose were: trachytes from Euganean Hills (Veneto), leucite-bearing lavas from the Vulsini Volcanic District (Latium), basic-intermediate leucite-bearing lavas from Somma-Vesuvius (Campania), silica undersaturated lavas from Monte Vulture Volcano (Basilicata), a rhyolitic ignimbrite from Sardinia and basic products from Mount Etna and the island of Pantelleria (Sicily). This paper contains a general outline of the trade network for each volcanic typology used for millstones during the Roman period – updated with data concerning the leucite-bearing lavic items discovered in the archaeological sites of the ancient Cuicul (now Djemila, Algeria) – together with a summary of their petrographic and geochemical features.     

OLYNTHUS MILLSTONES IN THE SOUTHERN LEVANT: THE BACKDROP TO THE MARITIME TRADE OF OLYNTHUS MILLSTONES

Abstract

This article aims to illustrate the background behind the maritime trade of Olynthus-type millstones in the eastern Mediterranean region. A look at the distribution of southern Aegean Olynthus millstones, whose provenances were identified by Williams-Thorpe and Thorpe’s petrographic analysis, reveals that millstones were not a major import into the southern Levant, where local Olynthus millstones were produced and distributed. They were more frequent in Cyprus, where they were valued locally due to the dearth of stones appropriate for use as millstones. The analysis of Williams-Thorpe and Thorpe also suggests that southern Levantine millstones, in contrast to millstones from earlier and later periods, were not exported to other Mediterranean regions. Shipwreck remains from the eastern Mediterranean, as well as the distribution of commercial Rhodian amphorae, reveal that Rhodian merchants carried wine and millstones from the southern Aegean to Cyprus. The southern Levant, where a number of locally produced Olynthus mills were unearthed, was self-sufficient in millstones. Hence, the Rhodian merchants, who dominated eastern Mediterranean trade, used the southern Aegean millstones as saleable ballast.     

The Manufacture of Millstones in the Eifel Region of Germany

Abstract

The Eifel massif in West Germany has provided building stone from pre-Roman times to the present day and has been the source of highly-valued millstones throughout the whole of this period. The purpose of this paper is to deal with the production of millstones in this region in particular and to analyse the various forms of millstones and the methods used in their extraction.     

Saints and Sinners: a tephrochronology for Late Antique landscape change in Epirus from the eruptive history of Lipari,Aeolian Islands

Assessing the impact of past human activity on landscape change in the Mediterranean has always presented challenges, requiring sound chronological frameworks for observed environmental change. The current research, focused on the environs surrounding the ancient city of Butrint (southern Albania) during Late Antiquity, c. 4th–6th Century AD, establishes a tephra-based chronology for landscape change through the discovery of ash horizons from a little known eruption on the island of Lipari (Aeolian Islands). Recovered glass shards were geochemically fingerprinted to a 6th Century AD event on the island, dated through local archaeological sequences and corroborated by hagiographic evidence. The presence of this marker horizon at Butrint shows a continuation of open water, estuarine conditions throughout Late Antiquity and the Early Medieval period (during which time Butrint ceases to function as an urban centre), disproving the widely held notion of increased soil erosion/deposition as a result of post-Roman landscape degradation. The study also shows that it is following the medieval revival of the town in the 13th Century that marked environmental change takes place, as estuarine areas silt, giving rise to marsh and wetland. The study highlights the importance of using a range of dating techniques to constrain landscape change, while the presence of the 6th Century Lipari tephra in Epirus, derived from an eruptive event larger than previously suspected, provides a useful regional dating marker for future landscape studies.     

Wet-Site Excavation and Field Methodology at Butrint,Albania: The Roman Forum Excavations Project

Since the start of archaeological research at the UNESCO World Heritage Site of Butrint (Bouthrotos/ Buthrotum) in southern Albania, archaeologists have allowed the water table to serve as a limit to archaeological excavation. From 2011 to 2013, the Roman Forum Excavations (RFE) Project conducted the first wet-site excavations at Butrint, reaching depths of up to 4 m below the water table in the ancient urban center. Well-preserved wood and other organic remains were recovered from waterlogged deposits, dating as early as the 7th century b.c. Major changes in RFE Project methodology emerged in response to wet-site archaeology. Unskilled local workers were trained to become local excavators. This significantly improved excavation techniques and recording procedures and enhanced the quality of the archaeological data, showing the high degree to which seemingly disparate elements of field methodology are intertwined.     

Millstones from Brockholm Quarry,Northumberland

Abstract

Several articles by Gordon Tucker have been included in this journal on the production of millstones and the present author provides additional material on their sources in Northumberland. Particularly interesting is the survival of an account book for millstone sales from Brockholm Quarry between 1842 and 1847, which indicates the geographical spread of their customers.     

THE OBSIDIAN IN THE AEGEAN BEYOND MELOS: AN OUTLOOK FROM YALI

Summary.   Obsidian is an important material circulated throughout the Aegean. Melian obsidian is found at many sites and researchers have concentrated on Melos without acknowledging obsidian from other sources. This article endeavours to highlight obsidian of non-Melian origin, such as that from the Carpathians, central Anatolia, Antiparos and, particularly, Yali. It is demonstrated that this latter source was a central one for certain islands, with its obsidian found at a number of sites in the Dodecanese and beyond. It is also emphasized that there were circulation modes of obsidian parallel to that of Melos, as well as different procurement conditions. Therefore, by including important regional sources such as Yali in the obsidian discourse, our understanding of obsidian exchange and circulation is enriched.     

Geochemical provenance analyses of Roman lava millstones north of the Alps: a study of their distribution and implications for the beginning of Roman lava quarrying in the Eifel region (Germany)

In Roman times, rotary querns and different types of millstones, driven either by horse-capstan or water power, were produced in the lava quarries of the quaternary volcanic Eifel region and exported to many parts of the Empire. The geographic distribution of Roman lava millstones from the Eifel region provides important information about trade patterns and, in cases of well dated millstones, also allows an estimate as to when the Roman lava quarrying in the Eifel region began. Sixty-two millstones from Germany, France and Austria were sampled and analyzed for major and trace elements by X-ray fluorescence. To determine their provenance, the millstone data was evaluated by a combination of geochemical discrimination and cluster and discriminant analyses using an extensive and detailed database of all Roman lava quarries in the Eifel region. An Eifel provenance could be confirmed for forty-four artefacts and, furthermore, determined down to the exact lava flow. The affiliation of the other artefacts to other possible regions where millstones of comparable lava were extracted was carried out on the basis of geochemical data from the literature. However, because of insufficient data, only assumptions about the regional provenance can be made. The origins of the other finds are assumed to be the Vogelsberg region, the Massif Central, Orvieto, and, possibly, the Pannonian Basin. A preliminary map of the distribution of Eifel millstones in Roman times based on these data is presented; the beginning of Roman lava quarrying can be constrained to 8–7 BC.     

Comparison of XRF and PXRF for analysis of archaeological obsidian from southern Perú

Chemical sourcing is becoming an increasingly important component of archaeological investigation. Instruments used for elemental analysis generally must be operated in a controlled laboratory environment. Further, many methods require destruction of a small portion of the objects under investigation. These facts inhibit the application of chemical sourcing studies in a number of research contexts. Use of portable non-destructive instruments would resolve these issues. Sixty-eight obsidian artifacts from the site of Jiskairumoko, in southern Perú, were examined by X-ray fluorescence spectrometry (XRF) and portable X-ray fluorescence spectrometry (PXRF). Results were compared for consistency in terms of source determination and individual element concentrations. Both instruments determined that the same sixty-six artifacts derived from the Chivay obsidian source and both identified the same two artifacts that could not be assigned to source. Individual element comparisons showed significant differences, but these can be resolved through instrument cross calibration, and differences had no bearing on source identification. PXRF was found suitable for determining obsidian sources in southern Perú and for identifying specimens that require more sensitive analytical methods such as, instrumental neutron activation analysis (INAA). Regular use of Chivay at Jiskairumoko suggests consistent trade relationships developed during the Archaic.     

Museum salvage: A case study of Mesoamerican artifacts in museum collections and on the antiquities market

Abstract

Museum salvage refers to critical studies of museum collections with little or no provenience information that seek to glean useful archaeological information from these artifacts and examine the nature of their origins and possible connections to the illicit antiquities trade and the art market. Our case study focuses on artifacts from Mesoamerica and objects from the ancient capital of Teotihuacan in particular. We take a multi-scalar approach, including a quantitative analysis of Sotheby’s auction records for Mesoamerican items from 1966 to 2010, a survey of Teotihuacan attributed items in U.S. museums, and a more detailed examination of Teotihuacan-style artifacts in the Denver Museum of Nature & Science collections. The study tracks and attempts to explain diachronic patterns in the Mesoamerican antiquities trade, connections to museum collecting practices, and looting behavior. The study illustrates the potential benefits of museum salvage, while also revealing the clear limitations of research on poorly documented archaeological material.     

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.     

Stable isotopic evidence of diet in a Greek colonial population from the Black Sea

Archaeological and literary sources indicate that the ancient Greeks relied heavily on terrestrial resources and that their access to certain types of foods varied by sex and status. Human and faunal remains from the Greek colonial site of Apollonia (5th to 2nd century BC) on the Black Sea coast of Bulgaria were analyzed for stable carbon and nitrogen isotopes in order to reconstruct the diet of this population, investigate the relative importance of marine vs. terrestrial resources, and explore variations in diet with respect to age, sex, and burial type. The results of this study indicate that the colonists of Apollonia relied on a mixed diet of terrestrial and marine foods, and that there was little or no variation in diet by age, sex, or burial type. The relationship between δ¹³C and δ¹⁵N data for these samples suggests that while marine foods were an important source of nitrogen, much of the carbon used to construct amino acids came from terrestrial foods.     

Oxygen isotopic evidence of residence and migration in a Greek colonial population on the Black Sea

Oxygen isotope analysis was performed on the enamel of the first and third permanent molars of 60 individuals excavated from the Kalfata-Budjaka necropolis associated with the ancient Greek colony of Apollonia Pontica (5th–3rd centuries BC) on the Black Sea coast of Bulgaria. The objective of this study was to examine the geographic origins and residential histories of these individuals and to compare the isotopic data with archaeological evidence derived from the burials in an attempt to distinguish ‘locals’ from ‘non-locals’. The analysis revealed that 55 of the 60 individuals sampled were either locally born or came from areas outside of Apollonia with isotopically similar δ¹⁸O values. Five individuals were identified as ‘non-local’, and their isotope values suggest that they originated from areas with higher δ¹⁸O_w of precipitation, most likely the Aegean region. Unfortunately, the archaeological evidence associated with these five skeletons provides no clues as to their place of origin.     

Cultural interactions during the Ubaid and Halaf periods: Tell Kurdu (Amuq Valley,Turkey) obsidian sourcing

In order to decipher cultural influences, the inter-regional contacts of the Tell Kurdu settlement have been investigated through obsidian sourcing for the Halaf and Ubaid phases (c. 5700–4300 cal. BC). The chemical composition of nine artifacts from three archaeological levels of the site have been determined and compared to source data obtained in our laboratory or available in the literature. Trace and major element analyses were performed respectively by inductively coupled plasma - mass spectrometry (ICP-MS) and atomic emission spectrometry (ICP-AES). The results assignments point out five distinct sources which highlight northwestward and eastward connections. Besides the “traditional” procurement areas (Göllü Dag and Nemrut Dag massifs; Bingöl region), the development of new exploitation centers (northeast Anatolia and northeast Van lake) is noteworthy. These results of obsidian provenances are compared to those of other raw materials and production originating from distant areas, in order to outline Tell Kurdu trade networks during the Halaf and Ubaid periods.     

Roman Millstones from Orvieto (Italy): Petrographic and Geochemical Data for A New Archaeometric Contribution

The probable site of extraction and production of Pompeian‐style leucite‐bearing millstones, singled out by Peacock (1980, 1986) in the vicinity of Orvieto, and the outcropping of the ‘Leucitophyre’ lava have been systematically studied employing standard petrographic and geochemical methods (optical microscopy and ICP–AES/MS spectrometry). The combination of petrochemical data, previously very poor, allowed us definitively to exclude the possible ‘overlap’ of phonolitic and tephri‐phonolitic lavas from other Quaternary Volcanic Districts of Latium, and provides a helpful tool for future work on leucitite millstones. Consequently, the databank obtained has been used to attribute the origin of five Roman millstones discovered in three archaeological sites in central Italy (Latium and Marche). It has also been useful to verify the geological provenance of some Sicilian and French leucitite millstones analysed by previous workers. The results point to a provenance from the Orvieto area, with the exception of the millstones from Sicily, for which a different origin was hypothesized.     

The volcanic millstones from the archaeological site of Morgantina (Sicily): provenance and evolution of the milling techniques in the Mediterranean area*

The Morgantina archaeological area, inhabited from the Early Bronze Age, had its widest expansion from the fifth to the first century bc . The volcanic millstones found at Morgantina fall into three different groups on the basis of the milling technique: (i) saddle querns (known from the Middle–Late Bronze Age and Iron Age); (ii) rectangular hopper‐rubbers (Olynthian) millstones, the invention of which dates to the fifth century bc ; and finally (iii) Morgantina‐type rotary millstones (starting to be used from the fourth to the third century bc ). In order to determine the provenance of the raw materials (lavas) used for all these millstone types, we collected 38 very small rock samples for thin‐section modal mineralogy, petrography and major trace element composition. The results have contributed to classifying different lithotypes and distinguishing between provenance from Etna and the Hyblean Mountains, the two volcanic areas respectively north‐east and south‐east of Morgantina. Saddle querns are made of tholeiitic basaltic andesites from the Hyblean Mountains and transitional basalts, mugearites and hawaiites from Etna. The variety of sources of portable saddle querns, mostly used in households, indicate that there was no general preference for specific quarrying sites. By contrast, the rectangular hopper‐rubber and the Morgantina‐type millstones, which document the period of Morgantina's greatest prosperity, are almost completely made of hawaiites from Etna. The use of a specific lithotype (i.e., Etna hawaiite) for the more efficient rectangular hopper‐rubber and rotary millstones could be linked to the fact that these mills may have been operated in business establishments. It is worth noting that the Gornalunga river was, in antiquity, a waterway joining Morgantina to the final stretch of the Simeto river and then the Ionian coast. The best candidate areas for the millstone hawaiite quarrying sites from Etna are the far south‐western sectors of the volcano, along the Simeto Valley (i.e., the ‘Piano Provenzana’ Formation) or the inner suburb of present‐day Catania (i.e., the ‘Pietracannone’ Formation). The very efficient Morgantina‐type rotary millstones spread during the reign of Hieron II of Syracuse (275–215 bc ) in eastern Sicily and met the need for grinding large quantities of cereals during a relatively peaceful time and a period of agricultural development.     

COMPOSITION VARIATIONS IN OBSIDIAN SOURCES AND THE ARCHAEOLOGICAL IMPLICATIONS*

An obsidian source can exhibit considerable variations in chemical composition. One such flow at Borax Lake in Lake County, California has been carefully investigated by neutron activation analysis of specimens from a number of different loci. It was found that the variable elements were completely coherent, and thus judgements concerning provenience could be just as definitive as with extremely homogeneous materials.     

The Watermills of Kent,East of the Medway

Abstract

Burrstones from France are universally, often uncritically, referred to as 'the best' millstones. In this article the author assembles something of the history of the most widely known of all stones, and probably the most widely distributed – those from La Ferté-sous-Jouarre. But not all French stones were burrstones, nor were they always of the same high quality.     

Millstones north and south of the Scottish border

Abstract

It is perhaps surprising that there should be very considerable differences in the practices of millstone-making in Scotland on the one hand and in England and Wales on the other. However, it has been emerging from recent studies and discussions, that such is the case. Both those millstones incorporating pieces of imported French burr and those made entirely from indigenous rock show differences between the two national regions. The purpose of the present short article is to draw attention to the nature of these differences as so far observed, and to encourage further reporting and discussion on such an interesting topic.