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.
Some of the prehistoric slate engraved plaques found in tombs in the southwest of the Iberian Peninsula. Credit: Eduardo Estellez / K. Lillios / Antonio Valera / V. Hurtado / Museus e Monumentos de ...