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- Title is exactly "<em>Entobia cretacea</em> (Portlock 1843) Trace fossil of sponge borings in oyster"
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Entobia cretacea (Portlock 1843) Trace fossil of sponge borings in oyster
(uncatalogued) The holes in this Gryphaeid oyster were left behind by a boring sponge. Boring organisms have the ability to dissolve calcareous shell which allows them to encrust other living and dead organisms.