Arizona

Araucarioxylon arizonicum (conifer wood; Triassic) (Figure 3.20).

Colorado

Stegosaurus stenops (plated dinosaur; Jurassic) (Figure 3.25C).

New Mexico

Coelophysis bauri (carnivorous dinosaur; Triassic) (Figure 3.18).

Utah

Allosaurus fragilis (carnivorous dinosaur; Jurassic) (Figure 3.25B).