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 species. The ammonite is well preserved on both sides with strong ribbing and suture lines and a hole in the centre. These are very popular ammonites but are becoming hard to find due to lack of erosion of the right layers in the cliffs. These large examples are especially uncommon these days.
These large Eoderoceras ammonites are often called the "king of pyrites" as they are the largest and most impressive pyrite ammonites found on the Jurassic Coast.
Around 196 million years old, this fossil would make a wonderful addition to any collection.