Herrerasaurus ischigualastensis, skull Tyrannosaurus Rex The last two photos on

The last two photos on the right show shell detail

of Rochester

and a stocky body

Until finds of other early stegocephalians and closely related fishes in the late 20th century

Allosaurus pes claw with base 6 inches long

Herrerasaurus ischigualastensis, skull Tyrannosaurus Rex The last two photos onHerrerasaurus (huh RARE ah SAWR us) (meaning "Herrera's lizard;" Victorino Herrera was a rancher who discovered the fossil) was a late Triassic archosaur (a reptile that was almost a dinosaur) from about 230 million years ago. It used to be thought to be a very early dinosaur and a primitive prosauropod. It was a speedy bipedal carnivore about 17 feet long, weighing roughly 440 780 pounds. It had a short neck and a large head. Three partial skeletons