A highly pyritised ammonite fossil of the species Promicroceras pyritosum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 21 mm (0.84 inches) across, which is very large for this species of ammonite. The ammonite is beautifully preserved on both sides: close to perfect. It is an unusual example as it has a large chunk of the outer shell missing. Scientific research has suggested that these marks are the bites of Jurassic predators that fed on these ammonites. The ribs are very finely defined and the golden colour 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