Comparison of human and faunal enamel isotopes reveals diverse paleodiet and exchange patterns at the highland Maya Site of Kaminaljuyu, Guatemala

This study provides an isotopic examination of both human and animal paleodiets and mobility patterns at a highland Maya community. Kaminaljuyu, Guatemala, was a large Prehispanic center located in a distinctly cooler, drier setting compared with the majority of Maya sites in the surrounding lowlands. Previous archaeological research at Kaminaljuyu revealed it played an important political and economic role in the Maya region, assisting in the obsidian trade network and maintaining ties with communities as far away as Teotihuacan in central Mexico. By examining the strontium (87Sr/86Sr), carbon (δ13C), and oxygen (δ18O) isotope values from dental enamel of humans and terrestrial mammals at the site, this study provides direct evidence of long-distance animal trade, explores the nature and timing of such activities, and compares highland dietary patterns with faunal studies in the lowlands. Our results indicate that isotopically non-local humans and animals are most frequently found in special and ceremonial contexts, indicating that long-distance movements of people and products were motivated for politically or ritually significant events. Although dietary patterns showed cross-species variation, diets within species were similar between highland and lowland settings.

Household Quarry-Reservoirs at the Ancient Maya Site of Yaxnohcah, Mexico

In this study, we present new data from the ancient Maya site of Yaxnohcah in southern Mexico. These data, which are drawn from lidar-based GIS analysis, field inspection, and the excavation of two small, closed depressions, suggest that many of this site's features served a dual function. Quarrying to extract construction materials left behind closed depressions that were then sealed to create household reservoirs. We classify these water-storage features as quarry-reservoirs. The ubiquity of these small quarry-reservoirs represented an important community water source outside the sphere of direct elite control.

Classic Maya Dental Interventions

Tooth extractions are among the most common dental procedures performed globally today; however, archaeological evidence for such procedures in the past is relatively scant and largely limited to the Classical world. We present a case of therapeutic dental extractions of pathological teeth at the ancient Maya site of Piedras Negras, Guatemala, during the Late Classic period (A.D. 600–800). The evidence comes from an assemblage of fractured, pathological teeth (n = 127) recovered from the marketplace at Piedras Negras during excavations in 2016 and 2017. We compare the Piedras Negras marketplace teeth to the broader Late Classic period mortuary population at the site along three lines of analysis: (1) distribution of teeth by type (incisors, canines, premolars, and molars), (2) pathologies, including dental caries and calculus, and (3) dental wear. We also explore in detail the fracture patterns apparent in the marketplace assemblage. Our results indicate that the marketplace teeth display a significantly greater caries rate than the broader mortuary population and that posterior teeth (premolars and molars) are overrepresented in the marketplace sample. These findings point toward therapeutic extractions intended to ameliorate pain associated with oral pathologies. This article presents one of the fewcase studies of ancient health care in the Americas and situates these practices within the market, an important, urban space across much of precolonial Mesoamerica. Las extracciones dentales se encuentran entre los procedimientos dentales más comunes realizados a nivel mundial en la actualidad. Sin embargo, la evidencia arqueológica para tales procedimientos es relativamente escasa en el pasado y se limita en gran medida al mundo Clásico. En este artículo, se presenta un caso de extracciones dentales terapéuticas de dientes patológicos en el antiguo sitio maya de Piedras Negras, Guatemala, durante el periodo Clásico Tardío (600-800 d.C.). La evidencia de este caso proviene de una colección de dientes patológicos y fracturados (n = 127) recolectados en el mercado de Piedras Negras durante las excavaciones realizadas en los años de 2016 y 2017. Estos dientes fueron comparados con otros dientes recolectados alrededor del sitio en contextos mortuorios del periodo Clásico Tardío a lo largo de tres líneas de análisis: (1) la distribución de los dientes por tipo (incisivos, caninos, premolares y molares), (2) las patologías, incluyendo caries dentales y cálculo y (3) el desgaste dental. Asimismo, se exploró en detalle los patrones de fractura aparentes en la colección del mercado. Los resultados de este análisis indican que los dientes del mercado muestran una tasa de caries significativamente mayor que los dientes recolectados en contextos mortuorios y que los dientes posteriores (premolares y molares) se encuentran sobrerrepresentados en la muestra proveniente del mercado. Estos hallazgos demuestran el uso de extracciones terapéuticas designadas a aliviar el dolor asociado a las patologías bucales. Este artículo presenta uno de los pocos estudios de caso de atención médica en el pasado en las Américas y sitúa estas prácticas dentro del mercado, un importante espacio urbano que se encuentra a través de la Mesoamérica precolombina.

Degradation of ancient Maya carved tuff stone at Copan and its bacterial bioconservation

Much stone sculptural and architectural heritage is crumbling, especially in intense tropical environments. This is exemplified by significant losses on carvings made of tuff stone at the Classic Maya site of Copan. Here we demonstrate that Copan stone primarily decays due to stress generated by humidity-related clay swelling resulting in spalling and material loss, a damaging process that appears to be facilitated by the microbial bioweathering of the tuff stone minerals (particularly feldspars). Such a weathering process is not prevented by traditional polymer- and alkoxysilane-based consolidants applied in the past. As an alternative to such unsuccessful conservation treatments, we prove the effectiveness of a bioconservation treatment based on the application of a sterile nutritional solution that selectively activates the stone´s indigenous bacteria able to produce CaCO3 biocement. The treatment generates a bond with the original matrix to significantly strengthen areas of loss, while unexpectedly, bacterial exopolymeric substances (EPS) impart hydrophobicity and reduce clay swelling. This environmentally-friendly bioconservation treatment is able to effectively and safely preserve fragile stones in tropical conditions, opening the possibility for its widespread application in the Maya area, and elsewhere.

SHIFTING SOCIAL RELATIONS DURING THE TERMINAL CLASSIC PERIOD (ca. a.d. 810–950/1000): CERAMICS FROM THE LOWLAND MAYA SITE OF UCANAL

The end of the Classic period was a tumultuous moment in Maya history, not only because the power of many dominant political centers waned, but because the ways in which elites and non-elites related to each other were increasingly called into question. To understand the nature of changing social relations in the southern Maya lowlands during this time, this study examines the distribution and provenance of decorated ceramics during the Late Classic (ca. a.d. 600–810) and Terminal Classic (ca. a.d. 810–950/1000) periods from the archaeological site of Ucanal, Peten, Guatemala. Comparisons of ceramics from different households across the site reveal that differences in access to decorated and imported ceramics decreased between these periods, suggesting that socioeconomic distinctions leveled out over time. In turn, chemical analysis of ceramics using a portable X-ray fluorescence instrument reveals that the site shifted its political-economic networks, with greater ties to the Petexbatun and Usumacinta regions and continued ties with the Upper Belize Valley.

THE ORIGINS AND IDENTIFICATION OF THE EARLY MAYA FROM COLHA AND NORTHERN BELIZE

Investigations concerning the earliest Maya have been of archaeological interest for many decades. Northern Belize serves as a valuable region for researching and understanding early Maya developments. In particular, the ancient Maya site of Colha in northern Belize is a focal point of some early developments beginning in the Archaic period. Select resources in the region, especially in the chert-bearing zone, clearly had been of great interest and attraction to populations extending back into Paleoindian and Archaic times, as well as the Maya period for Colha and other sites near the resource zone. With the appearance of pottery-producing settled villages is the common assertion that Maya societies are in place around 1000 b.c. Recent studies have identified much earlier occupants in the region with significant cultural developments, including semi-permanent occupation and horticulture occurring in the Late Archaic at approximately 3400 b.c. It seems plausible, perhaps likely by our assessment, that these Late Archaic people (or aceramic populations) may have been the earliest Maya communities. Factors of defining communities, aspects of horticulture, and the transition from the Archaic into the Preclassic are reviewed in consideration of—just who were the earliest Maya?