The Rivoli-Avigliana Morainic Amphitheatre is a complex sedimentary succession composed by glacigenic deposits related with several expansions of the Dora Riparia glacier.
The age of the preserved ridges span from Middle Pleistocene to the Last Glacial Maximum.

In Villarbasse we can observe three ridges: the more external and therefore the older one (Truc Monsagnasco, Truc Bandiera), composed of diamicton [https://en.wikipedia.org/wiki/Diamicton] with angular to subangular clasts and boulders (ablation till), an intermediate one (Tolaj, Vigne, Truc Carlevé, Simonetto, Baronis ridges) – (between the two the gap of the glacial spill-way of Basse, covered by lacustrine deposit), and the upper Pleistocene  ridge (Pian Topie – Cresta Grande).
More recent lacustrine deposits can be found in Val Lesiana – Ca’ di Paglia intermorainic basin.

[ARPA – Carta Geologica d’Italia-foglio 155 Torino Ovest, 2009]
The ridges are cut by perpendicular overflow channels which drain the spill-way valleys and form little alluvial fans (both Villarbasse and Corbiglia are built upon these deposits).

The Prato Perosino (Basse) spill-way is a well preserved fluvioglacial form [I Geositi nel paesaggio alpino della Provincia di Torino, Provincia di Torino, 2004]
During every glacial pulsation, the material carried down by the Glacier is deposited at the end of the valley.
Later on, erosion agents will remove part of the material and only the biggest blocks of rocks will be left behind: The Erratic Boulders.
The Rivoli-Avigliana Morainic Amphitheatre is a complex sedimentary succession composed by glacigenic deposits related with several expansions of the Dora Riparia glacier. The age of the preserved ridges span from Middle Pleistocene to the Last Glacial Maximum.
In Villarbasse we can observe three ridges: the more external and therefore the older one (Truc Monsagnasco, Truc Bandiera), composed of diamicton [https://en.wikipedia.org/wiki/Diamicton] with angular to subangular clasts and boulders (ablation till), an intermediate one (Tolaj, Vigne, Truc Carlevé, Simonetto, Baronis ridges) – (between the two the gap of the glacial spill-way of Basse, covered by lacustrine deposit), and the upper Pleistocene  ridge (Pian Topie – Cresta Grande). More recent lacustrine deposits can be found in Val Lesiana – Ca’ di Paglia intermorainic basin.
[ARPA – Carta Geologica d’Italia-foglio 155 Torino Ovest, 2009]
The ridges are cut by perpendicular overflow channels which drain the spill-way valleys and form little alluvial fans (both Villarbasse and Corbiglia are built upon these deposits). 
The Prato Perosino (Basse) spill-way is a well preserved fluvioglacial form [I Geositi nel paesaggio alpino della Provincia di Torino, Provincia di Torino, 2004]
During every glacial pulsation, the material carried down by the Glacier is deposited at the end of the valley. Later on, erosion agents will remove part of the material and only the biggest blocks of rocks will be left behind: The Erratic Boulders.
Villarbasse