Late Cretaceous dinosaurs from the Denver Basin, Colorado Author Kenneth Carpenter Department of Earth Sciences, Denver Museum of Nature & Science, 2001 Colorado Boulevard, Denver, CO 80205, U. S. A. Author D. Bruce Young Department of Earth Sciences, Denver Museum of Nature & Science, 2001 Colorado Boulevard, Denver, CO 80205, U. S. A. text Rocky Mountain Geology 2002 37 237 254 journal article 10.2113/gsrocky.37.2.237 41bd81a8-8d16-41cb-950f-8fab1660f845 3943081 cf. Torosaurus sp . Figures 8 and 11 Material. -DMNH 17060 left dentary with articular, splenial, left scapula and coracoid, cervical, posterior dorsal, sacrum, anterior caudal, posterior caudal, ribs, left humerus, partial ilium, ilium fragment, right pubis, right ischium, fibula fragment, metatarsal (Laramie Formation, Loc. 9). Description and discussion . — This ceratopsian specimen is tentatively referred to Torosaurus on the basis of the elongated humeral shaft below the deltopectoral crest ( Fig. 11 E , F) and elongated posteromedial process of the coracoid ( Fig. 8 C ; compare Johnson and Ostrom, 1995 , figs. 12.3-12.6, Hatcher et al., 1907 , fig. 64-66, and Figs. 11 C , E , F ). Unfortunately, the frill, which has the most diagnostic features, is not present. If the identification is correct, this is the first record of Tbrosaurus in Colorado. Much of this specimen is illustrated because little Tbrosaurus material has been figured before. Figure 16. Fragment of Pachycephalosaurus (DMNH 32649) dome in dorsal ( A ) and lateral ( B ) views from Denver Formation. Scale bar = 5 cm. The dentary is complete and retains all of the teeth, although some of them have slipped partially out of their alveoli ( Fig. 11 A , B ). The dentary is 63.5 cm long and the tooth row 47.3 cm. The articular is wedged between the tooth row and coronoid process. The vertebrae resemble those of other large neoceratopsians, such as Triceratops ( Hatcher et al., 1907 ), so are not figured. The scapula is proportionally short compared to dentary length, being about the same length (63 cm). In Triceratops , the dentary is apparently 75 percent the length of the scapula based on a skull and articulated skeleton (NSM PV20379). The scapula is 35 cm tall just posterior to the glenoid. The coracoid is nearly complete and has a distinct ventromedial projection (see Johnson and Ostrom, 1995 , fig. 12.5) that is not seen in Triceratops . It is 27.3 cm long and over 43 cm tall. The humerus is crushed, thereby distorting the deltopectoral crest and the medial humeral tuberosity ( Fig. 11 B , F). The humerus has a midline length of 60 cm, is 37 cm wide proximally, and 28 cm wide distally. The pubis is missing its postpuhic process, hut otherwise it is relatively complete, although much covered with plaster of Paris. The ischium is missing both the proximal and distal ends.