The area of the Piano delle Streghe is characterized by the presence of gentle, undulating morphologies, the result of the erosive action of the Pleistocene glaciers upon the rocks of the Dimon Formation two million years ago. These rocks, easily eroded, were formed from sediments deposited on the bottoms of ancient seas during the Carboniferous, before the entire area was subjected to the upthrusts linked to the Hercynian Orogeny which gave rise to the Palaeocarnic chain. From here there is a panoramic view across the middle valley of the Bût Torrent which allows the observer to examine several geosites from afar, including the ancient landslide niches of Monte Rivo and Monte Cucco and the cone of the Rio Randice.

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Evidence of ancient submarine eruptions
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Fusulinid-bearing limestone pebble conglomerates