Baby dinosaurs from the Late Cretaceous Lance and Hell Creek formations and a description of a new species of theropod Author Carpenter, Kenneth text Contributions to Geology, University of Wyoming 1982 1982-01-31 20 123 134 journal article 10.5281/zenodo.3238510 a342eb67-842d-41ab-a05d-3f010d0038ec 3238510 Family CERATOPSIDAE Fig. 10 Material: Teeth: UCM 37878 (UCMP-V5711) H 6 mm , W 3.8 mm ; UCM 43526 (UCMP-V5711) H 2 mm , W 2.5 mm ; UCM 45057 (UCMP-V 5711) H 3.6 mm , W 3.8 mm ; UCM 45058 (UCMP-V 5711) H 3.5 mm , W 4.1 mm ; and UCM 45059 (UCMP-V5711) H 4 mm , W 3.7 mm . Discussion : Only UCM 45059 is heavily worn. Unworn teeth have a triangular enameled face with a vertical medial ridge ( Fig. 10 ). Small denticles are present along the upper edge of the enameled surface. Unlike adult ceratopsian teeth, these have a single unbifurcated root, a condition Hatcher and others (1907) noted for young incipient teeth. It is doubtful that these small teeth are incipient teeth of an adult, because they are well developed and have a long root, which is unlike the short, thin-walled, open root of the adult. It is probable that the root became bifurcated as the animal matured. Because there are two genera of ceratopsians ( Triceratops and Torosaurus ) in the Lance and Hell Creek formations, it is not possible to be more specific in the identification.