Family PACHYCEPHALOSAURIDAE

cf. Pachycephalosaurus sp.

Figure 16

Material. — DMNH 32649 portion of skullcap (Denver Formation, Loc. 20).

Description and discussion. — A portion of thickened parietal is all that is present of the skull roof (Fig. 16). The bone is very dense, making identification as pachycephalosaurid certain. The outer surface is moderately grooved; no nodes are present on the specimen, indicating that the fragment is not from the periphery of the skull.