Pozzo C-6 di Piaggia Bella

A fissure pit in Jurassic limestone, with an entrance 10 m long and from 1.5 to 0.4 wide. It is one of the few cavities in the area opened along a vertical fracture (direction S 40° W). At its widest point it begins with a flaring due to external agents, then narrows to a width of 50 cm and then gradually widens to 1 m going downward. The floor, at a depth of about 20 m, is hidden by a mass of perennial snow. The walls are smooth and slightly undulating or sculpted into cups aligned vertically.

The cavity appears to have originated at depth, through diffuse chemical erosion (water films). The fact that it opens on a roche moutonnée would indicate that it is decapitated. Around it and parallel to it are narrow lapiaz fissures, but little more than 1 m deep and with a «V» cross-section.