Ammonite Rondiceras Fossil | Natural Pyritized Fossilized | Upper Jurassic | Mikhailov, Riazan Region, Russia | SO24 Hematite Origin: Brumado

Origin:  Brumado

Origin: Mined in Reaphook Hill

Name: Cerussite

Of interest

Ammonite Rondiceras Fossil | Natural Pyritized Fossilized | Upper Jurassic | Mikhailov, Riazan Region, Russia | SO24 Hematite Origin: BrumadoA superb example of pyritized ammonites of the genera Kosmoceras, Quenstedticeras and others of the Callovian Stage (161 m. y. a) deposits of Russia. The high degree of preservation of natural mother of pearl shell makes it appear to be preserved as fire opal. This is a consequence of light passing through the various layers of aragonite and conchiolin deposited by the ammonite in life. The lack of acidity in the depositional environment allowed them