The hill was also exploited to extract the “conglomerate”, a sedimentary rock made by gravelly and pebbly elements, which fortifications, houses and religious buildings were built with. In some areas there are sandstone banks and at 20 or 30 meters deep, banks of a marly nature can be found.
Peculiar is the “Red Earth”, which confirms the presence of calcareous soils: this particular phenomenon is due to the mix of clayey soils and iron oxide. Hydrological wealth and soil fertility were enhanced and organized to reach full development with Benedictine and Cluniac monasticism, when the morainic agricultural area and the contiguous one were divided into farms. These favorable conditions, together with the minerality of the soil, make wines of this area unique.