Dinosaur fossils refer to the disappearance of soft tissues in the body due to decay after the death of dinosaurs, and the hard tissues such as bones (including teeth) are deposited in sediments and isolated from oxygen. After tens of millions or even hundreds of millions of years of deposition, bones are completely mineralized and preserved. In addition, the remains of dinosaur life, such as footprints, can sometimes be turned into fossils and preserved. Archaeological dinosaur fossil toys are educational toys made by merchants for children and related enthusiasts.