The credit for the discovery of the first dinosaur fossils in 1822 goes to Mary Ann Mantell, although her husband, Gideon Mantell, played a significant role as well. Mary Ann Mantell discovered a fossilized tooth in the quarry of Cuckfield, Sussex, England. She recognized that the tooth was unlike any known animal and suspected it belonged to an ancient reptile. Gideon Mantell, who was a physician and geologist, studied the tooth further and correctly identified it as belonging to a new group of extinct reptiles, which he named "Iguanodon" in 1825. This discovery marked the beginning of the scientific study of dinosaurs.