A stunning example of a highly pyritised ammonite fossil of the species Eteoderoceras (Eoderoceras) armatum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 79 mm (3.1 inches) across with matrix, which is large for this species. The matrix represents the crushed outer whorl of the ammonite, so it is the true size of the shell. The ammonite is well preserved with strong ribbing and suture lines and is clean on both sides. It also has some of the much sought-after spines still preserved and it has a lovely metallic colour and shine. A beautiful, chunky fossil.
These are very popular ammonites and examples like this are uncommon these days.
These Eteoderoceras 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.