A sea shell is the name for the hard protective layer of a marine organism.

They are invertebrates, and are usually sea molluscs, but there are many other varieties of marine animals from different phyla.

Brachiopods, Sea Urchins, Sand Dollars, and Marine Annalid Worm Tubes, also form part of this extensive group.

They are highly prevalent in the fossil record throughout the world.

MORE SHELL GROUPS UNDER "Scuptural Artworks" SECTION

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Siberian shell fossils

An unusual group of fossilised Jurassic shells from Siberia, Russia

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Clam Shell

Matrix free clam, Mercenaria, from Florida, USA

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Leptaena depressa

Leptaena depressa fossil brachiopod from Shropshire, UK

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Pair fossil Oyster Shells

A ice pair of fossilised oysters, dating from the Cretaceous Period

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