detournementsmineurs:Quenstedtoceras ammonite fossilwith iridescent and pyratized shell, Saratov Reg
detournementsmineurs:Quenstedtoceras ammonite fossil with iridescent and pyratized shell, Saratov Region of Russia, middle Jurassic (Upper Callovian Stage) or approximately 161-164 million years old. -- source link