Ankylosaurs —

Hunt, A. P. & Lucas, S. G., 1992, Stratigraphy, paleontology and age of the Fruitland and Kirtland Formations (upper Cretaceous), San Juan Basin, New Mexico, New Mexico Geological Society, New Mexico Geological Society 43 rd Annual Fall Field Conference Guidebook, pp. 217-239 : 228

Ankylosaurs —

Several localities in the Fruitland and Kirtland yield nodosaurid scutes. Keeled scutes of nodosaurids can be distinguished from ankylosaurids in that ankylosaurid scutes are commonly excavated on their medial surface and thus are thin ( Coombs and Maryanska, 1990). In contrast, nodosaurid scutes tend to be flat or only slightly cupped on their medial surface ( Coombs and Maryanska, 1990). NMMNH P-20880 ( Fig. 8 K-L) represents the first specimens of a nodosaurid reported from the Fruitland Formation. These specimens are thick, keeled plates with only slightly concave medial surfaces. NMMNH P- 1078 ( Fig. 8 I-J) is two large keeled plates of a nodosaur from the Naashoibito Member of the Kirtland Formation. These plates are similar to dorsal scutes of Edmontia (Coombs and Maryanska. 1990, fig. 22.13 upper).

Figures

FIGURE 8. Dinosaur bones from the Fruitland and Kirtland Formations. A, Chevron of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in posterior view. B-C, Ribs of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in medial view with healed fractures D-E, Edmontosaurus saskatchewanenss, right humerus (NMMNH P-1041) from the Naashoibito Member of the Kirtland Formation in posterior (D) and anterior (E) views F, Posterior left tibia and astragalus of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in posterior view. G Left femur of indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in posterior view. H. Articulated left metatarsals 2 and 3 of an indeterminate hadrosaur (NMMNH P-1043) from the upper Fruitland Formation in anterior view. I-J, Indeterminate nodosaurid osteoscutes (NMMNH P-1078) from the Naashoibito Member of the Kirtland Formation in dorsal view. K-L, Indeterminate nodosaurid osteoscutes (NMMNH P-20880) from the upper Fruitland Formation in dorsal view. M, Third phalanx of fourth digit of pes of a tyrannosaurid (NMMNH P-20879) from the Naashoibito Member of the Kirtland Formation Scale bars are 10 cm except for G (50 cm) and I (1 cm).