often have cusps which are repetitive shoreline features. The cusps
themselves are steep with the cusp embayments between being more gently
sloping. In this example, in Cushendun, County Antrim, the cusps are
made of gravel and the embayments are of finer sands. The spacing
in this case was about 3 metres, although they be spaced anywhere
between 10 centimetres and 50 metres. The reason for their formation
is not known but is thought to be related to swash action.