270 million years ago a mass of boiling granite forced its way through the overlying softer rocks to the surface, resulting in the formation of Land's End Peninsula. This Land's End Landmark is one of four roughly circular granites domes that form the backbone of Cornwall, and there is a wealth of tin and copper to be found in the interface of granite and softer rock. The coast landscape is notoriously wild, and the weathering action of wind and salt-spray has produced classic rocky coastal scenery with rock arches, sea stacks, and rugged cliffs which range in height from 61 to 122 metres high.