The adult allosaurus was found in 1994 and the juvenile and stegosaurus in 2002, but it has taken nearly 20 years of painstaking work and additional digs to piece the fossil bones back together ...
Allosaurus was the most common large carnivore of the Late Jurassic in North America. It was a smaller predecessor of the Cretaceous Tyrannosaurus. Strong forelimbs with sharp claws, powerful hind ...