Tracks Of A Bipedal Dinosaur
tenuis (dinosaur tracks)
Time: Late Triassic/ Early Jurassic Lower Lias, Rhaetian Age (~200
million years ago)
mm by 60 mm and 60 mm by 45 mm on a 235 mm by 205 mm matrix
tracks are an unusual fossil in that they are one of the few types
that provide information about the dinosaur's behavior in life.
They preserve a distinct moment in time, and provide information
about not only dinosaur behavior, but also about the environment
in which the dinosaurs lived. Dinosaur tracks have been found on
every continent except Antarctica. They can be petrified replicas
of the footprint impression, natural casts (the result of infilling
of footprints by sediment), or undertracks
formed by the impact of the foot on underlayers.
fine pair of casts is of the ichnogenus Grallator (heron-foot),
first described by Edward Hitchcock in 1858. The first tridactyl
print was discovered in the Connecticut Valley 1802 and was attributed
to “Noah’s Raven”. These bird-like tracks are
thought to have been made by a coelurosaurian theropod similar to
Coelophysis. Notice the fine details seen here that include the
impressions of the claws and footpads on the larger example.
see: Dinosaur Fossils