Fossil sponges. Fossilized sponges (phylum Porifera) of an unidentified species. These specimens are from the Eocene period, 55 to 40 million years ago. Sponges are simple aquatic animals with a porous skeleton that may be made of fibres or based on silicon or calcium. They live in colonies attached to underwater surfaces, and feed by filtering bacteria and organic matter from seawater. Found at Bracklesham Beds, Sussex, UK.
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