Ammonites are possibly the most widely known fossil. These creatures lived in the seas between 240 - 65 million years ago.  

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The Fossil Collection mainly uses two different species of ammonites-

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Crucilobiceras Densinodulum

These were found at Stonebarrow, Charmouth, Dorset. They are one of the most commonly found ammonites found at Charmouth and are about 196 million years old, early jurassic.

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Promicroceras pyritosum

Also one of the most commonly found species at Charmouth,Dorset.

196 million years old, early jurassic.

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I occasionally use a few other species in my jewellery collection -

Microderoceras inexpectans

Oxynoticeras lymense

(Both also found at Charmouth, Dorset, 196 million years old )

Quenstedoceras ( Found at Weymouth,Dorset, 150 million years old)