A stunning and giant 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 118 mm (4.6 inches) across with matrix which is very large for this species and about as big as it gets in this condition. The matrix is composed of the crushed outer whorl which has some of the big defensive spines sticking out of it. The ammonite is beautifully preserved on both sides with great detail in the ribbing, spines and sutures. There is also a very large serpulid worm tube cast on one side. It has a golden colour and shine distinctive of these pyrite fossils. These fossils are very hard to find these days due to a lack of erosion of the right layers in the cliffs on the Jurassic Coast. It is a heavy fossil for its size, weighing 650 grams.
Around 196 million years old, this fossil would make a wonderful addition to any collection