A stunning example of a highly pyritised ammonite fossil of the species Eoderoceras bispinigerum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 100 mm (3.92 inches) across, which is very large for this species. The ammonite is very well preserved on both sides with highly detailed suture lines, ribbing, and especially the double-row of spine tubercles. This is the rarer species of this ammonite type and it has this distinctive double row of spines on the outer whorl. They are not often found and even less often offered for sale.
A crack in the fossil has been stabilised and there has been some minor repair work around the crack, but this does little to take away from the quality of the specimen.
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 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.