Seashore Most of Shoreham Beach is shingle giving way to sand which is visible at low tide.
Groynes prevent longshore drift from the west .
In the entrance to Shoreham Harbour , there are artifical rocky shores at Kingston Beach near the Lighthouse, and at the Old Fort beach on the other side of the River Adur . At Kingston Beach there are extensive mussel beds, with lots of periwinkles, although a spate of over-collection during the 1980s decimated the beds and Serrated Wrack has now established itself, because of the reduction of the grazing molluscs. Shore Crabs are particularly abundant at Kingston because it is the entrance to the Adur Estuary . The long spring tide went out below Chart Datum on Kingston beach and there was a meal of large prawns Paleamon serratus . The presence of a dozen very small Common Starfish , Asterias rubens , was unusual for this particular shore.