A highly pyritised ammonite fossil of the species Promicroceras pyritosum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 30 mm (1.12 inches) across with matrix, which is large for this species. The ammonite is well preserved in a pyrite matrix, which is really unusual for this species that is almost always preserved without matrix. 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. A really impressive specimen.
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.