Geochemical analysis of Late Classic and Post Classic Maya marketplace activities at the Plazas of Cobá, Mexico

Abstract

Lines of evidence for ancient exchange plazas may include trade routes and trade artifacts, urban open space near public structures, and rock alignments denoting market stalls, but regular patterns in soil chemical concentrations also point to marketplace use. We applied geochemical and geospatial analysis of the floors of the main Plaza of Group B and Plazas A, H, and J of Group D at Cobá, Mexico, to discover the chemical residues of phosphorus (P) and metals associated with the exchange of foodstuffs and mineral workshop items that may have been marketed there. The patterns of chemical residues in the floor of the Group B Plaza suggest ritual activities while the linear, parallel patterns of elevated Mehlich phosphorus and chelate extractable zinc concentrations in Plaza A support the hypothesis of market exchange at that location. Plaza H is associated with several Postclassic buildings, including the Pinturas Structure D-33. During the Postclassic period, Cobá had lost much of its population, though chemical residues from Plaza H are congruent with marketing. We argue that Plazas A and H were not permanent marketplaces but rather multi-purpose locations that also hosted large ceremonies.     

Agroindustrial Soilscapes in the Caribbean: A Geochemical Perspective from Betty’s Hope,Antigua

ABSTRACT

This research examines the chemical impacts to soils caused by the industrialisation (mechanisation and mass production) of sugar and rum manufacturing in the Caribbean during the eighteenth and nineteenth centuries. Soils and sediments excavated from Betty’s Hope sugar plantation (1674?1944) are chemically characterised by mild acid extraction and inductively coupled plasma-mass spectroscopy. These data are integrated with analyses of soil properties, including colour, texture, pH and organic matter, to examine activity patterns in areas associated with a large multi-use building dating to the period of industrialisation. Quantitative analysis of the data employs zero-order and partial linear correlation, multidimensional scaling, principal components analysis and spatial interpolation using semivariogram modelling and Kriging. The results reveal the locations of activity areas inside the building, which aids in understanding its role in sugar and rum production. The research also reveals evidence for soil contamination by heavy metals (lead and mercury), suggesting that plantation sites from this period may be polluted with industrial wastes. These findings have implications for activity reconstruction in the archaeological past as well as environmental and community health issues today.     

Phosphate Analysis of Anthropic Soils

Abstract

The use of phosphate analysis in archaeology is possible because past human occupation and activities increased the amount of soil phosphorus in the areas occupied. The accumulated phosphorus in archaeological deposits tends to remain constant through time and is measurable through soil sampling and chemical analysis, thereby providing archaeology with a valuable tool, applicable to a wide variety of research situations. Phosphate analysis is especially useful in surveying large areas to locate and delimit sites.     

Phosphates, plowzones, and plazas: a minimally invasive approach to settlement structure of plowed village sites

Inferences about settlement structure play an important role in explanations of social and political change in Late Prehistoric eastern North America, but ethical and logistical challenges posed by extensive horizontal excavations mean that archaeologists must develop low cost, minimally invasive methods for investigating key properties of village structure. There are two important components of most villages in the region: 1) the peripheral distribution of middens; and 2) the size and location of formal communal spaces or plazas, each of which leaves traces in soil chemistry. In shallowly buried, plowed village sites where artifacts have been physically displaced, the chemical signature of middens may be more resistant to disturbance and provide an enduring signature of ancient settlement structure. We conducted a systematic soil phosphorus survey at the Reinhardt Site (33PI880) in central Ohio, the primary occupation of which occurred during the Late Prehistoric Period (ca. AD 1200-1450), to test for the presence and approximate size of a central plaza and the shape and distribution of peripheral midden deposits. Soil samples from the modern plowzone (N = 131) were analyzed for Mehlich II extractable phosphorus using molybdate colorimetry. The interpolated phosphorus distributions indicate a clear ring midden approximately 90 m across with an internal plaza that is roughly 30 m × 40 m. Artifact distributions from a shovel test pit survey and interpolations of plowzone magnetic susceptibility measurements identify the location of the village but are ambiguous with regards to village size and do not clearly distinguish the central plaza. Our results suggest that systematic surveys of soil phosphorus are a rapid, minimally invasive, and inexpensive method for generating data on the size and shape of villages and their plazas.     

Investigating Activity Patterns In Prehispanic Plazas: Weak Acid‐Extraction ICP–AES Analysis of Anthrosols at Classic Period El Coyote,Northwestern Honduras

Weak acid‐extraction ICP–AES analysis was performed to obtain multi‐elemental characterizations of anthropogenic sediments from plaza spaces that no longer contain artefacts and adjacent trash deposits at the prehispanic site of El Coyote in northwestern Honduras. Multivariate quantitative assessments of the anthrosol chemical data, along with associated inventories of midden materials, are examined to derive signatures for activity areas and refuse dumps that can be linked across portions of the site. The findings of this study permit the reconstruction of activity patterns in the site's main plaza and in its environs. This has important implications for understanding the relationship among ritual practice, craft production and political economy during the Late and Terminal Classic periods, c. ad 600–1000.     

Lithic Production and Consumption Patterns from the Great Platform at Late Postclassic (A.D. 1350–1525) Tzintzuntzan,Mexico

Late Postclassic period (a.d. 1350–1525) Tarascan economic activities often included higher degrees of political involvement and territorial control compared with other ancient Mesoamerican societies. Here I examine Tarascan obsidian economies through an analysis of lithic production and consumption patterns from structures excavated on and near the Great Platform at the imperial capital of Tzintzuntzan. Four spatially distinct patterns are evident. Great Platform residents used high-quality obsidian blades as ceremonial items or burial offerings and scrapers for craft production. Lower elite residents of Structure F, outside the Great Platform, produced their own blade tools and consumed a higher percentage of green obsidian than residents of the Great Platform. Excavations at Yacata 3 recovered bifacial arrowheads and obsidian bloodletters associated with disturbed offerings. The spatial distributions of lapidary preforms and highly polished fragments combined with accounts from the Relación de Michoacán (a.d. 1541) suggest that lower elites produced obsidian jewelry near the Great Platform.     

Kaleidoscopes,Palimpsests, and Clay: Realities and Complexities in Human Activities and Soil Chemical/Residue Analysis

The following article presents a new approach to the spatial and chemical analysis of residues left by the cycle of activities that interweave specialized clay griddle production with other domestic tasks at two house lots located in the Mexican town of Cuentepec, Morelos. Based upon multivariate spatial statistics and image analysis techniques, this analytical approach allows for a more robust definition of activity areas across multiple data domains. These patterns, and the general approach by which they were created, provide a framework for evaluating the potential of applying social theories in archaeology for the interpretation of chemical residue analysis.     

Recovering social and cultural dynamics from plaster floors: chemical analyses at ancient Chunchucmil,Yucatan, Mexico

Phosphate analysis and trace metals analysis were used to determine activities that took place on plaster floors in domestic contexts at the ancient Maya site of Chunchucmil, Yucatan. Research on activities and the use of space contributes to an understanding of social relations within household groups as well as unforeseen patterns that structure refuse discard. The floors analyzed in this paper pertain to three structures in two neighboring houselots dating to the Early Classic (300–600 A.D.) period. Data from the chemical analyses were utilized in conjunction with associated architectural features and artifacts found on the floors. These three lines of information were interpreted with the help of models developed from ethnographic and ethnoarchaeological research. The results demonstrated functional differentiation of rooms within elaborate residences and suggested that front rooms were used to host visitors. The results also suggested that different types of debris were managed differently. Finally, chemical analyses suggest that non-elite Maya occasionally enacted rituals often restricted to elites.     

The Compositional study of ceramic samples from tombs dating to the Zhou Dynasty at Xiaoshan,Zhejiang Province (China)

Xiaoshan in Zhejiang Province was an important ceramic production area in ancient China. During recent years, local archaeologists have found a number of mound tombs dating to the Zhou Dynasty and the Spring and Autumn period. Many shards of stamped stoneware and proto‐porcelain have been unearthed from these tombs. In this paper, we report how we collected ceramic shards from tombs and samples from local ancient kilns as reference materials in order to clarify their relationship. We have used the energy‐dispersive X‐ray fluorescence technique to analyse the chemical composition of the ceramic samples. The results indicate that some of the tomb artefacts may be imported from other production areas. We infer that the other tomb samples were produced at local kilns, but due to production process–related compositional differences, there are small differences in chemical composition between different categories of samples.     

Production centers of cooking pots in Iron Age Judah

This paper will present and discuss a multifaceted research project dealing with the production of cooking pots during the Iron Age II (ca. 1,000–586 BCE) Judah (modern Israel). In particular the new compositional analysis of 541 cooking vessels from 11 sites in Iron Age Judah will be presented. The study employs petrographic and chemical (NAA) analysis. The results of this ongoing research have already produced interesting information about production centers and movements of cooking pots in Iron Age II Judah. Apparently, the vast majority of the cooking pots sampled were made of a similar type of clay, related to terra rossa soil. This is true also for sites in the northern Negev and Judean Desert, where the type of soil was not available in the region of the sites. Furthermore, many of the cooking pots distributed around Judah were made in Jerusalem according to a well-located chemical profile (JleB). Other groups may represent Judean Shephelah production centers as the Lachish area as well as production centers in southern Israel or ancient Edom. The implications of the importation patterns of cooking pots by peripheral Judean sites will be discussed.     

Relict Soils and Early Arable Land Management in Lofoten, Norway

Relict arable soils dating fromc.AD700 provide an opportunity to identify early arable land management practices in the agriculturally marginal landscapes of the Lofoten archipelago, northern Norway. Synthesis of field survey and soil thin section micromorphology supported by image analysis suggests that there was deliberate management of erodible sandy soils in sloping locations to create small areas of cultivation terrace, with a range of materials used as soil amendments to stabilize the accumulated soil and enhance fertility. Small areas of sandy soils in more gently sloping locations were also cultivated, again with a range of materials used as amendments and which contributed to a significant increase in soil thickness. The last phase of cultivation commenced during the late 1800s and involved the reclamation of wetter, peaty soils by spade. These patterns of arable land management are repeated in different parts of Lofoten and indicate that despite the climatic and economic marginality of arable activity in Lofoten, land management practices were developed and applied to permit barley production from small areas.     

The Source Provenance of Bronze Age and Roman pottery from Cyprus

Archaeological interpretations of ancient economies have been strengthened by chemical analyses of ceramics, which provide the clearest evidence for economic activity, and comprise both the objects of exchange and its means. Pottery is often manufactured from local materials, but its compositional diversity typically prevents significant patterns of resource utilization from being identified. Centrally located and positioned on traditional shipping routes, Cyprus maintained ties with and supplied a variety of distinctive ceramic products to the major commercial centres in the eastern Mediterranean throughout Antiquity. We analysed two Cypriot .ne wares and a variety of utilitarian pottery, as well as samples of extant Cypriot clays to determine source provenance. These chemical analyses provide an objective indication of the origins of ancient (Bronze Age and Roman) ceramics manufactured on Cyprus. The distribution of the probable clay sources and the links between pottery style and the material environment also afford a perspective on the spatial organization of large‐scale pottery production on the island. Compositional analysis provides the means to assemble geographies of pottery production and to unravel the interregional system of exchange that operated in Antiquity, but the ability to accomplish these tasks is predicated on systematic analyses of ceramic products and raw materials that are found far beyond the bounds of individual archaeological sites.     

Staple food preparation at Teotihuacan

Like studies of craft production, research on food production has significant implications for understanding the economic organization of past societies. This paper highlights the tools of maize (Zea mays) processing and cooking as a constructive avenue to examine aspects of food production at Teotihuacan during the Terminal Formative and Classic Periods (100 BC–AD 650). By analyzing the spatial distribution of comales, metates and manos recovered from the Teotihuacan Mapping Project, this study investigates the notion that edible maize products were produced through specialized labor. Two notable patterns are observed. First, the aggregation of comales along the Street of the Dead during the Miccaotli phase (AD 100–170) suggests that tortilla preparation fueled large public work projects, feeding the workers, their families, and other dependents of the state. Secondly, the spatial aggregation of grinding stones, manos and comales in seven concentrated areas within the Classic Period (AD 170–650) occupation of the city suggest that several apartment compounds, possibly entire barrios, may have specialized in the production of tortillas and other finished maize foods for exchange. Such a pattern may have resulted from the costly labor and materials required for the production of tortillas, favoring economies of scale. Several areas within the city conspicuously possessing low frequencies of maize processing artifacts suggest that some sectors were dependent on specialized labor from outside the household for daily needs. Together, these data suggest that food production was a specialized activity at Teotihuacan and increase our understanding of the economic organization of the ancient metropolis.     

Modeling the Roles of Craft Production in Ancient Political Economies

Ongoing debates over the significance of specialized production in ancient political economies frequently hinge on questions of whether elites or commoners controlled craft manufactures and whether the material or ideological import of these production processes was more significant in deciding power contests. Though long recognized, such queries were traditionally answered in relatively straightforward economic terms. Recently, these time-honored approaches have been questioned. An ever increasing number of authors are promoting varied takes on the causal linkages between political forms and processes, on the one hand, and patterns of production, distribution, and use of craft goods, on the other. The literature generated by these discussions is extensive, vibrant, and often confusing. Rather than trying to synthesize all reports and essays dealing with specialized manufacture, this paper highlights general interpretive trends that underlie and structure current debates. The concluding section offers suggestions for how studies of relations among crafts, power, and social heterogeneity might be pursued profitably in the future.     

ELECTRON PROBE MICROANALYSIS OF MIXED-ALKALI GLASSES

European mixed-alkali glasses are compared with Sayre and Smith's categorisation for ancient glass and with the chemical compositions of other prehistoric and later European glasses. The new categories reported here indicate that a wide range of alkali raw materials was used in the production of glasses found in prehistoric European contexts. At least five major chemical categories of glass are now known to have been used in prehistoric and early Roman Europe. A plant species of the genus Sulicorniu is suggested as a possible alkali source in ancient European glasses.     

Some Critical and Methodological Aspects of Shoreline Determination: Examples from the Baltic Sea Region

Coastal shorelines worldwide are generally unstable and changing. The study of the precise relation between any archaeological site and the shoreline at the time when the site was used is therefore complicated, but still often not met with appropriate methodological approaches. In this article, we test models based on phosphate analysis and discuss how they can be used to detect ancient shorelines. We propose that a model of increased and oscillating phosphate values at the former water level is considered reliable and useful in areas with advancing shoreline.     

Glaze-paints,technological knowledge,and ceramic specialization in the fourteenth-century Pueblo Southwest

The advent of glaze-painted ceramics by Ancestral Pueblo peoples in the US Southwest occurred during an important period of cultural change. In east-central Arizona, potters used glaze-paints to decorate a striking, representational-style pottery during the early fourteenth-century AD. We evaluate the possibility that these vessels were manufactured by emergent specialists who possessed crafting-knowledge that was not widely shared with others in their communities. Time of flight-laser ablation-inductively coupled plasma-mass spectrometry (TOF-LA-ICP-MS) was used to characterize the composition of a large sample of red ware sherds from sites in the Silver Creek area. This analytical approach precisely measures the chemical composition of paints, which can then be used to model ancient technological “recipes.” Our study highlights the complexities of craft production in small-scale societies and the utility of practice-based versus typological approaches to specialization.     

Settlement Patterns and Development of Social Complexity in the Yiluo Region,North China

Abstract

This international, collaborative, and interdisciplinary archaeological program examines changes in settlement patterns from the early Neolithic to the full development of states (ca. 6500–200 B.C.) in the Yiluo region of central north China. Full-coverage regional surveys are integrated with geoarchaeological investigations, ethnobotanical studies, and lithic analyses. The data are used to assess changes in population, environment, land use, agricultural production, and craft production, and to test theoretical propositions regarding the emergence and development of social complexity. Research results suggest a significant sociopolitical transformation taking place in the Yiluo basin during the Erlitou period, including the development of the first four-tiered settlement hierarchy, marked population nucleation, and economic integration between urban center and rural areas. These changes indicate the emergence of the earliest state in China.