The geological strata composing the mountain are sedimentary rocks of the Mesozoic era, that were originally laid down on the seabed. The base of the mountain comprises muschelkalk beds; its upper layers are made of Wetterstein limestone. With steep rock walls up to 800 metres high, it is this Wetterstein limestone from the Upper Triassic that is mainly responsible for the rock faces, arêtes, pinnacles and the summit rocks of the mountain. Due to the frequent occurrence of marine coralline algae in the Wetterstein limestone it can be deduced that this rock was at one time formed in a lagoon. The colour of the rock varies between grey-white and light grey to speckled. In several places it contains lead and zinc ore. These minerals were mined between 1827 and 1918 in the Höllental valley. The dark grey, almost horizontal and partly grass-covered layers of muschelkalk run from the foot of the Great Riffelwandspitze to the Ehrwalder Köpfe. From the appearance of the north face of the Zugspitze it can be seen that this massif originally consisted of two mountain ranges that were piled on top of one another.