SKYSCAN / SCIENCE PHOTO LIBRARY SKYSCAN / SCIENCE PHOTO LIBRARY
Chesil Beach, aerial photograph. Chesil Beach is a depositional landform known as a tombolo. It stretches 29km from the mainland at West Bay (Bridport) on the Dorset coast to the Isle of Portland. This view is looking west. The exact evolution of the beach has still not been agreed, though longshore-drift is one theory. Evidence for this is indicated by the grading of the material along the beach, with the smallest pebbles at West Bay and the largest at Portland. The water to right of the beach is a tidal lagoon of brackish water (saline) known as the Fleet, which is an important habitat for wading birds. The sediments within the lagoon are believed to be at least 6- 7000 years old.
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