taken 5 years ago, near to Deganwy, Conwy, Wales
Shell lag
The channel known as the north deep cuts across the wide tidal flats of Conwy Bay, while at low tide the river channel heads westwards. The North Deep dries at mid-tide, and is the reason why unwary walkers are so often stranded on distant sandbanks. Because of the length of the alternative river channel the tide ebbs and flows very quickly, carrying away fine sediment on every tide. The result is a fabulous lag deposit comprising mostly mussel and cockle shells.
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