This pyrite (pyritized) fossil is from Charmouth Beach, Charmouth, West Dorset, Dorset, England, United Kingdom. This is Englands favorite fossil collecting area. Animal fossils from the Jurassic Period wash out of the cliffs and can be found mixed in the gravels of the beach. Several species of minerals contributed to the fossilization of the animals including pyrite.The pyrite in this specimen is in a nodule form with a well defined exposed ammonite present. The pyritized fossil of the now extinct ammonite is named Eoderoceras armatum and it is exposed on both sides of the nodule. It dates to about 196 million years in ago. It this piece measures 2 1/4 x 1 11/16 x 11/16 inches or measures57 x 42 x 18 mm.