crinoid fossils from a bed of limestone

This picture shows Crinoid remains in limestone.

Crinoids are sometimes called sea lilies, but are in fact creatures related to starfish and sea urchins.

So many lived in our seas that sections of Jurassic limestone can be made up entirely from their massed remains.

Crinoids stuck themselves to the sea bed with long stalks. Then they used their grooved, flower-like cups to gather in food from the currents.

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the Jurassic seabed
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