Updated May 24, 2021    Collectors, online sellers and some dealers periodically ask me to help them in the identification of tyrannosaur type teeth.  So I thought I would put together a guide from North America to help in identification.      The following is the current understanding of Tyrannosauridae species described/known in North America with the stratigraphic unit where they are found.  If I missed any let me know.   Albertosaurus sarcophagus : Horseshoe Can