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The Lentina Stone

Erratic boulders: silent witnesses of time

Italia, Regione Lombardia, provincia di Como, Bellagio

Positioning

Piano Rancio

COORDINATES
(CH 1903) E   739502 N   88330 H   925.0
(WGS 84) Long.   9.237 Lat.   45.932
GENERAL EVALUATION
DIFFICULTY T-T1
SCIENTIFIC INTEREST PRIMARY:
Glacial morphology

SECONDARY:
OTHER INTERESTS Historical
GEOSITE   GEOMORPHOLOGICAL - glaciers

DESCRIPTION

This is a huge erratic boulder (i.e. carried by glacial ice) of granodiorite and ghiandone rock, originating from Val Masino (Valtellina). It measures about 30 metres long by 10 metres wide by 9 metres high with a volume of about 1500 cubic metres. It has a flat upper surface, affected by small hemispherical cavities dug by man, known as “cuppelle”. These may be found alone or in groups, sometimes interconnected by small channels. They were made during an era that goes from the Neolithic up to the age of Christianization, while their exact meaning or function is unknown.

INSIGHT

The Lentina Stone is comprised of an intrusive rock (granodiorite), which is similar to granite but is characterized by a greater presence of plagioclase and has a darker appearance. The name derives from the presence of large crystals of potassium feldspars (orthoclase), whose roughly rectangular shape is reminiscent of that of acorns. The rock comes from Val Masino, a side valley of Valtellina, and was carried in a southerly direction down to its present location by the Abduano Glacier.

CURIOSITIES

A popular old tradition interprets the “cuppelle” on top of the rock as a sign of fireballs that playful devils threw at each other for fun. On top of the Lentina Stone there are also several incisions with dates, names and symbols, the oldest of which date back to 1746.
scala temporale periodi geologici

HOW TO REACH THE SITE

The Lentina Stone is located approximately 500 metres along the road which descends from Pian Rancio down to Bellagio.

USEFUL INFORMATION FOR THE VISIT

http://www.cmtl.it/csc-dettaglio.aspx?IDContenuto=129&txtCerca=lentina

project | contacts | links | partners
Programma di cooperazione transfrontaliera Italia - Svizzera 2007 - 2013 Progetto cofinanziato dal Fondo Europeo Sviluppo Regionale (FESR)
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