New observations on the Perugia Hill rock substrate

The geological and geoarchaeological study developed in collaboration with the Soprintendenza per i Beni Archeologici dell’Umbria during the stabilisation works of the Perugia Cathedral, has permitted us to observe the urban ground layer on which the church was built on the morphologically highest zone of the Perugia Hill. We have observed for the first time the geological substrate, which has been hidden for centuries under the Cathedral’s foundations. The field observations carried out under the Cathedral’s foundations have brought to light two stratigraphical sections, each one several meters thick, which were studied in detail, despite the especially bad underground conditions.