The lakes are located in a basin, the origin of which is linked to glacial erosion. Within the basin are several waterbodies, some of which have a regular rectangular or rhomboid shape. It is likely that this regularity is due to the presence of fault systems, and/or networks of fractures laid out along specific directions. Thus bands of weakness were created in the rock masses that favoured the erosive action of the glacial mass.

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Stromatoporoids at Cason di Lanza
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