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http://www.seahouseswebsite.co.uk/SeahousesSands/SeahousesSands.htm includes photos of holes and bumps in seahore sand for which no satisfactory explanations are on offer. (The particular section starts "The sands are part of an ecosystem".) Suggestions, corrections and supplementary information will be welcomed by email@example.com.
(There are pages about dunes, rocks and tidal zonation too. Written by a non-expert, corrections and other improvements will be welcomed.)