A highly pyritised ammonite fossil of the species Echioceras raricostatum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 35 mm (1.4 inches) across. The ammonite is well preserved on both sides with a small hole in the centre. The ribs are very finely defined and the pyritic colour and shine is beautiful. A great example of an uncommon species.
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.