5th February 2008 On the Southern path to the summit one finds le "Gouffre du Béout". A cave at an altitude of 670m which leads to a large vertical shaft. (Length and amount of tunnels unknown, as I had forgotten my torch!)
It was here in 1974 that M. Lacrampe found several long bones of a reindeer (Late Pleistocene Period) in "clay of the filling, under a stalagmite(?) floor" which had probably accidentally fallen in. Yes, I'm afraid my translating from the French leaves something to be desired....
So you can read the article yourself (near the beginning is the most relevant bit)