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 98 mm (3.9 inches) across, which is huge for this species and about as big as they get in this condition. The ammonite is very well preserved on both sides with highly detailed suture lines, ribbing, and spines. There is some minor crushing on the inner whorls that happened during the fossilisation process. These are very popular ammonites and some of the finest pyrite fossils from anywhere in the world. It has been sealed with a removable varnish for protection. It is a chunky and heavy ammonite, weighing 300 grams.
Around 196 million years old, this fossil would make a wonderful addition to any collection.