Antichi manufatti ipogei: le fosse granarie di San Giovanni in Marignano (Rimini)

The study focuses on the analysis of the hypogeous pits for the conservation of cereals in the historical center of San Giovanni in Marignano (Rimini). This small town in the low Valle del Conca (Conca Valley), on the border between Marche and Romagna, 3 km away from the sea, has a high concentration of underground silos protected by a fortified enclosure, this was known already in the late Middle Ages. Those silos were used to store the cereal products of a very productive territory, it is a sort of “wheat bank”, a huge container for cereals that was the reason why the castle in modern times was called: “The barn of the Malatesta family” (noble family). Some research was carried out in archives and according to notarial sources of the XIV-XVI centuries, and it was confirmed by other information from ancient city statutes and printed texts (XV-XIX centuries) concerning the problems on the conservation of wheat and on the making of underground silos. That research provided interesting information on the making, the placing and the capacity of these pits, furthermore recently a diagnostic exploration was executed in the underground of San Giovanni in Marignano, analyzing high-frequency electromagnetic waves penetrating into the ground (Ground Penetrating Radar), such exploration located and detected precisely the pits