This is a very rare ROOTED fossil dinosaur tooth of Edmontosaurus annectens, the predominant hadrosaur species that can be found in the Lance Formation of Wyoming, U.S.A.. Adding to the rarity is the fact that it is UNBROKEN and is unerupted, with no feeding wear. Finding ANY dinosaur tooth with its root still attached is the rarest of all dinosaur teeth. It means this tooth is not a common tooth that was shed during the life of the dinosaur - the dinosaur died with this tooth still in its jaw! Finding such a fossil tooth that has survived millions of years with the root still attached, makes it all the more rare!
Hadrosaurs were an important part of the food chain as these herbivores were a primary food source for the meat-eating dinosaurs in the same region, namely Tyrannosaurus rex, Nanotyrannus and Dromaeosaurs. No fossil tooth collection should be without at least one nice complete example tooth to display alongside fossils of the very dinosaurs that terrorized these peaceful beasts of the Late Cretaceous.