Grallator variabilis, dinosaur track (negative) Styracosaurus Over time a new tooth

Over time a new tooth would grow from the old tooth socket

The teeth were so closely packed that they formed a comb

Exactly how it lived and what it ate are still open to speculation

we have relatively little real data on the tooth replacement rates of modern day sharks

Grallator variabilis, dinosaur track (negative) Styracosaurus Over time a new toothThe 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,