The Jurassic Coast stretches over a distance of 153 kilometres (95 mi), from Orcombe Point near Exmouth, in the west, to just beyond the great chalk headland of Ballard Down and Old Harry Rocks here in the east. The coastal exposures along the coastline comprise a continuous sequence of Triassic, Jurassic and Cretaceous rock formations spanning approximately 185 million years of the Earth's history. The rock layers along the Jurassic Coast are tilted towards the east. The oldest part of the coast is found at its west end, while progressively younger rocks form the cliffs here to the east. Old Harry Rocks mark the most easterly point of the Jurassic Coast, a UNESCO World Heritage Site. Reference : Wikipedia