A Boring Sponge (Cliona celata) - these colourful sponges bore holes in limestone causing pitting and small channels- in pic2 you can see the effects along with the larger holes made by shellfish called Wrinkled Rock-borers (Hiatella arctica).
County Clare, Ireland.
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A mixture of Wrinkled Rock-borers (Hiatella arctica) Boring Sponges (Cliona celata) and wave action has created this "Hag stone". County Clare, Ireland.
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