Notice the greater depth of the track in the toe region, which suggests a horizontal posture for the dinosaur while it was walking. However, a deep claw impression is visible on the far left toe, probably indicating a shift of the theropod's weight to the left. The right-left bipedal progression along a narrow midline, in addition to the footprint shape, is characteristic of theropods. Ornithopods were also capable of leaving bipedal trackways but were mostly facultative bipeds. Ornithopod tracks are present in deposits from the Jurassic through the Late Cretaceous but are particularly common in Late Cretaceous deposits.
Hadrosaurs are probably the best known ornithopods that left tracks attributable to the trackmaker.
Skeleton is in the Museum of Western Colorado's Dinosaur Valley, Grand Junction, Colorado. This ornithopod track was cast in the bottom of a sandstone bed, hence you are looking at the bottom of the footprint in positive relief. Track is in the Museum of Western Colorado's Dinosaur Valley, Grand Junction, Colorado. The side view of the same ornithopod track depicted previously shows some pressure ridges in the central toe area, caused by the forward motion of the animal when it was walking. This track is also preserved as a sandstone cast, so you are looking at the bottom of the footprint.