Rare pliosaur vertebrae pair featuring striking pyrite replacement, sourced from the Volga River in Russia's Ulyanovsk Region. These fossilized marine reptile bones showcase natural mineral transformation and exceptional preservation. Larger specimen measures 13 x 3 x 7.5 cm; smaller measures 12 x 1.5 x 7.5 cm. A museum-quality addition for serious paleontology collectors and fossil enthusiasts seeking authentic, one-of-a-kind specimens with documented provenance.
