Echinoid (sea urchin) fossil

Lyme Regis on the ‘Jurassic’ South Coast of England is well known for its Ammonite graveyards, Ichthyosaurs and dark organic rich mud facies which is an oil source rock. The top of the cliffs contain Cretaceous beds and where land slips have brought these down to the beach occasionally you can find Echinoids (sea urchins) beautifully fossilised in flint. This is one I was lucky to find (Echinocorus?) last week which is probably around 100 million years old.