The final emersion of the Lessini region took place during the Tertiary era, 25 -30 million years ago, and the rocks in this area, since the moment of their subaerial exposition, were subjected to the action of atmospheric agents which caused their modification and fragmentation.
The hydrographic system of the highest part of the Fumane valley has a fluvial origin and displays a juvenile morphology, with steep walls and V-shaped tight bottoms. The waterfalls were originated along the rivers because of the presence of rocks with different levels of erodibility.
The clayey waterproof layers of the Biancone limestone prevent meteoric water from filtering under the ground, thus causing the creation of springs.
(from: http://www.parcodellecascate.it/eng_parco.php)
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