Lago Pehoe.. View of the equally majestic Cuernos del Paine — the “Horns of Paine.” “Horns” is an apt description of the two peaks because each is a sheer wall of light gray granite crowned by a jagged horn of dark brown metamorphic rocks.Seen from Lake Pehoé, the sharp contact between the two rock types angles upward from right to left. This is because the metamorphic rocks arch over the top of a mushroom-shaped granite body known as a laccolith. The laccolith began to form 12.6 million years ago The laccolith is adjacent to the modern Patagonian Ice Cap, and the mushroom’s top stands just above 3,000 meters elevation