Almost the entire length of the Dorset coast forms the major part of the Jurassic Coast World Heritage Site, designated in 2001. This coast is notable for the variety in its geological structure and resultant landforms, and for the abundance of fossils found within its cliffs. The rocks of the Jurassic Coast in Dorset range in age from the Early Jurassic in the west to the Cretaceous in the east. Within the length of Dorset's coast can be found examples of a nearly circular cove (Lulworth Cove), a very clearly exposed and accessible geological fold (Stair Hole), a natural sea arch (Durdle Door), sea stacks (Old Harry Rocks), an active landslip (Black Ven), and numerous and often quite spectacular cliffs, including the highest cliff on England's south coast, Golden Cap.