TV5397 : Rough Bottom
taken 8 years ago, near to Friston, East Sussex, England
Forming part of the South Downs on the South Coast, the Seven Sisters are a stunning series of white chalk cliffs between Cuckmere Haven and Birling Gap. They are the remnants of dry valleys in the chalk downs, which are gradually being eroded by the sea... Read more at Wikipedia Link
Dry valleys are relict landforms left over from the ice age. During the ice age, ice plugged all the pore spaces in the chalk rendering it impermeable. During the summer months meltwater would carve a valley and create the feature. After the ice age the chalk became permeable and porous and all surface water was lost leaving an obvious water carved valley, but now dry.
They are common on the dip slopes of Chalk escarpments.