Solitary witnesses of the past
|(CH 1903)||E 740345||N 80693||H 613.0|
|(WGS 84)||Long. 9.246||Lat. 45.863|
Gravitational phenomena and processes
The “Earth Mushrooms” are located on the right side of the valley of the Rezzago River and are a Natural Monument of the Lombardy Region. These structures are formed by the erosive action exerted by the runoff of soils of glacial origin. The glacial deposits are those left by the Abduano glacier, coming from the north, during its last phase of glacial maximum (about 20,000 years ago). The run-off of rainwater leads to a gradual erosion of the moraine material, composed of rock blocks of various sizes, immersed in a sandy matrix. The largest stones, initially immersed in the deposits, have protected the underlying morainic material during erosion, while all the surrounding material, not enjoying the protection of such an “umbrella”, has been removed. The result is the “Earth Mushrooms”, known in scientific literature as the “Pyramids of Erosion”. With the passage of time, these structures lengthen and become increasingly thinner, until, when the rock which has protected them collapses, there remains only the column of narrow material, exposed to atmospheric agents and so rapidly eroded.
From S.S. 339, connecting Como to Lecco, turn to the north, continue up to Erba and then to the Valassina. Once in Canzo, follow the signs to the village of Rezzago.
Park your car at the post office in Rezzago. From there you proceed into the village, going down towards the river. The trail starts at the bridge which crosses the valley.