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 122 mm (4.8 inches) across with matrix which is enormous for this species and about as big as it gets in this condition. The matrix on this one is the crushed outer whorl which has many 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. The inner whorls are slightly crushed on one side and distorted on the other 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 545 grams.
Around 196 million years old, this fossil would make a wonderful addition to any collection