Grallator variabilis, dinosaur track (negative) Styracosaurus 5 inches long on the

5 inches long on the longest side

Typical of early carnivorous mammals

Fossils have been discovered in Spitsbergen

Spinosaurus probably had over 70 straight conical teeth that lacked serrations

Stretching nearly two feet long

Grallator variabilis, dinosaur track (negative) Styracosaurus 5 inches long on theThe study of fossilized footprints, Ichnology, has become an important branch of paleontology. Footprints are trace fossils. They are considered trace fossils because they contain no fossil material, only the impressions left by the animal which made them. It is often difficult to determine with certainty which animal made a given print and therefore they are usually attributed to a group rather than a specific animal. Grallator is an ichnogenus,