The use of volcanic materials for the manufacture of pozzolanic plasters in the Maya lowlands: a preliminary report

This paper focuses on the description and characterization of the nature of isotropic and silicon-rich particles observed in plaster samples from the Maya archaeological sites of Calakmul and Lamanai. Based on the composition and morphology of these particles, it is proposed that volcanic ash and glass were incorporated into some of the ancient Maya plasters in order to produce hydraulic reactions. From a technological point of view, the intent on the part of the Maya to produce such reactions is relevant because it would reflect resource planning and complex knowledge of materials. Results also confirm previous reports of the presence of volcanic ash layers at the site of Calakmul and suggest that there were considerable ash falls in the Maya lowlands during Prehispanic times which may have made the material available in many areas of the Central Lowlands. If, as we propose here, volcanic ash was employed in lowland Maya plasters, then the use of volcanic materials by the lowland Maya was more intensive than has been recognized. Our paper also reviews the literature about the use of volcanic materials in lowland Maya materials and suggests future lines of research.