Abstract
A site investigation based on several mechanical boreholes and ground probing radar in La Tenderina-Ventanielles (Oviedo) have permitted to obtain a detailed section of the Tertiary and Quaternary deposits that constitute its subsoil. The base of the Quaternary cover exhibits punctually a funnel-shaped morphology, that seem to have its origin in collapse sinkholes (dolines) created by dissolution-collapse processes in an underlying karstified gypsum level of Tertiary age. This ancien depression was infilled by Quaternary deposits composed of alluvial sand and gravel, and marhsy organic-rich mud. Within the Tertiary materials underlines a massive gypsum level up to 18 m thick that permits to specify the superficial extension of the lacustrine basin developed during Middle-Late Eocene (probably Early-Middle Bartonian).
