Small Pyritized Ammonite

Jurassic-Cretaceous  Discovered in Russia What is Pyritized Ammonite? Pyritized ammonites are fossilized ammonites in which the original organic material and shell have been replaced by pyrite, a mineral also known as iron sulfide (FeS₂). This type of fossilization preserves the detailed morphology of the ammonite, providing a valuable and often strikingly beautiful record of these ancient marine cephalopods. The pyritization process occurs under specific geochemical conditions and offers significant insights into the fossilization process and the paleoenvironment. The pyritization of ammonites involves several steps, influenced by the geochemical conditions of the sediment in which they were buried: Anoxic Conditions: Pyritization typically occurs in anoxic (oxygen-depleted) environments, such as deep-sea sediments or stagnant basins. These conditions slow the decomposition of organic matter and create a reducing environment conducive to pyrite formation. Presence of Sulfate-Reduc