The territory included in the ZSC is part of a large, gently sloping flat area whose main framework is the enormous cone of dejection of the Cellina stream. It is a thick cushion of rough alluvial sediments of calcareous-dolomitic nature, represented mostly by pebbles, gravels and to a lesser extent by sand of fluvioglacial origin, whose formation has been originated even by the most recent post-Würm floods. This means that the main impetus for erosion and subsequent deposition of these alluvial materials took place by the fluvioglacial waters of the same Cellina, fed by the massive melting of the caps starting from the end of the last glacial phase (about 10,000 years ago).