The Engraved Slate Plaques of Late Neolithic and Copper Age Iberia: A Statistical Evaluation of the Genealogical Hypothesis

The engraved slate plaques were part of an extensive and variable class of ritual objects in Late Neolithic and Copper Age Iberia, with Classic plaques being the most numerous and standardized type. Classic plaques have a top and base separated by a horizontal line or bands, and base registers of repeating design elements (triangles, checkerboard, etc.). Associated with burials, they have been interpreted as genealogical records, with their base design referencing a clan or other social unit and their number of registers denoting the generational distance of the deceased from an important ancestor. The authors evaluate the genealogical hypothesis using a larger dataset than available when originally proposed, employing statistical analyses to examine the relationship between the number of registers and find locations, and between design elements and tomb size. Tomb size is viewed as a measure of collective labour, and hence a proxy of the status of the individuals in the tomb. These analyses show significant patterning between the number of registers and the plaques’ geographic distribution, and between specific design elements and tomb size, suggesting that the genealogical hypothesis remains a plausible explanation for the Classic plaques.