The great Tournemire amphitheatre is one of the most outstanding escarpments of the western edge of the Larzac and as such is classified "Zone Natura 2000". The lower slopes are the only part where Toarcian marls are visible in the SW erosion gullies, everywhere else these marls are hidden under rocky slopes and big rock slides. At the top of the slopes, the dolomitic limestone ruin-shaped cliffs frame the outline of this amphitheatre.