A stunning example of a highly pyritised ammonite fossil of the species Eoderoceras (Eteoderoceras) armatum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 66 mm (2.6 inches) across, which is a good size for this fossil type. The ammonite is well preserved in a pyrite matric and has a beautiful metallic iron pyrite colour and shine. Part of the outer whorl is missing, which is most likely due to predation - a Jurassic marine predator took a bite out of the shell that killed the ammonite. These are very popular ammonites but are becoming hard to find due to lack of erosion of the right layers in the cliffs.
Around 196 million years old, this fossil would make a wonderful addition to any collection.