20809 - Well Preserved 2.48 Inch Spinosaurus Dinosaur Tooth Cretaceous Ophiura about 515-520 Ma ago) of

about 515-520 Ma ago) of Laurentia and are among the oldest known fossils of echinoderms

Minerals were located and identified using BSE mode on Hitachi S3000N SEM coupled with an X-ray detector Bruker XFlash 3001 for microanalysis (EDS) and mapping

Proceedings of the United States National Museum 41(1870):479-484

Referred species: Halisaurus ortliebi (Dollo

• Silurian to Devonian of China

20809 - Well Preserved 2.48 Inch Spinosaurus Dinosaur Tooth Cretaceous Ophiura about 515-520 Ma ago) ofSpectacular example of tooth belonging to an individual of Spinosaurus. The enamel color is spectacular, featuring intense brilliant tones. This tooth has been stabilized on its surface by Paraloid B 72 to ensure its stability and consistency. This process does not affect neither the color nor any of the characteristics. It simply makes the specimen better preserved in the long term. The teeth with strong and vivid fossilization colors such as red,