Projectile Points Poster by Robert L. Pyle West Virginia Styracosaurus corrugated surface with which to

corrugated surface with which to chew

They were the dominant predator of the Cretaceous Age which ended about 65 million years ago

and was inhabited by a rich fauna of marine life such as this crab

(meaning "pavement lizard" for dense clusters of teeth) is a genus of extinct edaphosaurid synapsid that lived in what is now North America and Europe around 300 to 280 million years ago

a 17 meters (56 feet) long Megalodon would have a mass of about 65 tons

Projectile Points Poster by Robert L. Pyle West Virginia Styracosaurus corrugated surface with which toNOTE: Points on the poster are shown actual size 1: 1 scale. In archaeological terms, a projectile point or arrowhead is an object that was hafted to weapon that was capable of being thrown or projected, such as a spear, dart, or arrow, or perhaps used as a knife. They are thus different from weapons presumed to have been kept in the hand, such as axes and maces, and the stone mace or axe heads often attached to them. Stone tools, including projectile