The largest glacier inTicino
|(CH 1903)||E 682510||N 144070||H 1891.0|
|(WGS 84)||Long. 8.512||Lat. 46.443|
Hydromorphologie, Structural geology, Karst morphology, Glacial morphology
Mineralogy / petrology
Landscape, Didactic, Hiking, Architectural
The most reliable tests to quantify the changes in glaciers over the last millennia are provided by moraine deposits preserved in excellent condition between Valletta di Fiorina and Pizzo Pecora. The location of these deposits allows a determination of the extent of glaciers in different epochs and, consequently, to re-establishing some climatic stages in the recent history of the Earth. In the case of Robièi, this would be from 11,000 years ago, when the moraine was deposited immediately north of Pizzo Pecora. The clearest and largest signs are the extensive lateral moraines deposited during the Little Ice Age (1850). These true moraine ramparts are visible downstream of the Basòdino and Cavergno Glaciers. In the complex proglacial margin of the Cavergno Glacier, in addition to the imposing stage of 1850, one can recognize its evolution since 1600. The Robièi region is also famous for some karst of particular value and rarity developed in very localized layers of Triassic marble. The carbonatic rock has undergone joint erosion by glaciers and their melt waters which, laden with carbon dioxide, reach a very high corrosion potential. For this reason, it is easy to come upon typical shower furrows and gouges in the emerging layers within the geological site, looking like those in a plowed field, just a few hundred metres from Lake Bianco. The marble in the area near Pian Glacier in Valletta di Fiorina is also affected by this same corrosion phenomenon. Here, the weight of the glacier has dug a depression where the river vanishes without forming a pool. The water has found a way to drain through the rocks, excavating what up to now is the longest known cave in Ticino. L’Acqua del Pavone (The Peacock’s Water – its name comes from the shape of the stunning resurgence of the waterfall) – winds underground for over three kilometres from Pian del Ghiacciaio to Zött Lake.
From Exit 47 of the A2 (Bellinzona Sud) proceed in the direction of Locarno. Follow the A13 until the exit for Vallemaggia after the Mappo-Morettina tunnel. Once in Vallemaggia, continue for another 23 kilometres until Bignasco. Then turn to the left towards Bavona Valley, at the end of which San Carlo is situated. The cable car station, with a large car park, is located above the village.
The area is excellent for excursions of all kinds and for people of all ages. You should bring the appropriate equipment if you want to leave the road that leads to Lake Cavagnöö.
CORTI G. et al. (2011): Sentiero glaciologico del Basòdino. Tipografia Poncioni. Losone. 94 pp.
COTTI G. et al. (1990): Introduzione al paesaggio naturale del Cantone Ticino.Vol. 1, Le componenti naturali, Bellinzona, 484 pp.
DECUYPER H. & ANTOGNINI M. (2008): Magie di pietra. Locarno. Armando Dadò.
VALEGGIA C. et al. (2006): I ghiacciai del Ticino. Dati, statistiche e società 6(2).