A highly pyritised ammonite fossil of the species Promicroceras pyritosum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 17 mm (0.68 inches) across. The ammonite is very well preserved on both sides with some unusual crushing in the outer whorl where it compressed towards the middle of the shell before fossilisation. The ribs are very finely defined and the pyritic colour and shine is beautiful. A great example of the species and incredible in the flesh.
These pyrite ammonites have long been used to make beautiful natural jewellery.
Around 196 million years old, this fossil would make a wonderful addition to any collection.