The giant stone that lies here is made from dolomite, which, like all the dolomite ranges in the Stubai Valley, is made up of what is known as Brenner Mesozoic. It is proof of the tremendous rock movements that took place here in the Pinnis Valley several thousand years ago, in the middle of the Elfer’s flanks and the Serles mountain crest. The stone is thought to have broken in two auf crashing to the ground and has remained here split open ever since.