Family HADROSAURIDAE

Fig. 9

Material: Teeth: UCM 45060 (UCMP-V5711) H 3.6 mm, W 3 mm; and UCM 45061 (UCMP-V5711) H 2.9 mm, W 3 mm.

Discussion: The teeth show heavy usage wear (Fig. 9); a similar condition was noted by Horner and Makela (1979) for baby hadrosaurs recovered from the Two Medicine Formation. It has been standard procedure to assign all isolated hadrosaur teeth from the Lance and Hell Creek formations to Edmontosaurus (= Anatosaurus); however, there may be yet another genus of hadrosaur in the Lancian (M. Brett-Surman, personal communication).