Gastropods, or snails, are common fossils thanks to their strong, easily preserved external shells. Quite a few fossil gastropods are traded commercially, including members of the genus Turritella. This particular genus first appears in the fossil record during the mid Cretaceous and includes many species still alive today. If you know where to look, you can even find their shells washed up on beaches around the British Isles, often in considerable numbers, reflecting the success of these animals even today.
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