Thirty meters high, the Roquefort waterfalls have produced a rare and very fragile phenomenon: a tuffière.

A veritable natural geological curiosity, a tuffière or petrifying waterfall is formed from tuff, a powdery, crumbly limestone, ranging in color from white to beige. As the water in the Turasse springs is particularly calcareous, the tuff is deposited on mosses and pieces of wood in the form of a crust. The disappearance of these plant debris, through fermentation, gives the rock its porous, sponge-like texture.