The East Cliff runs for several miles from Pool Valley towards Rottingdean and Saltdean, reaching above sea level. The soil beneath it, a mixture of alluvium and clay with some flint and chalk rubble, has experienced erosion for many years. The cliff itself, like the rest of Brighton's soil, is chalk. Below this are thin layers of Upper and Lower Greensand separated by a thicker band of Gault clay. The land slopes upwards gradually from south to north towards the top of the Downs.