Lyon pentes Croix-Rousse, Gros Caillou

The Gros Caillou (the large pebble) was extracted and conserved during the construction work of the Croix-Rousse funicular (Croix Paquet) in 1862. It is extremely hard and compact, formed of Triassic metamorphic quartzite rock deposited from the Alps by a Rhône Glacier. It is a symbol of the CroixRousse.