The nearshore areas of the sound are predominantly rocky. Sunlit shallow bedrock is covered by dense kelp forest but, as the depth increases light begins to fade and a more patchy kelp park only extends down to around 22m.

Below this, rock surfaces are encrusted with red corraline seaweeds, ther white calcareous scrawls of tube worms, fine fillegrees of sea firs and sea mats, Gelatinous sea squirts, multi- coloured anenomes, cup corals and lamp shells are found, as are fleshy dead mans fingers and soft sponges which are grazed by sea urchins and brittlestars

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