Diplocaulus, amphibian skull Styracosaurus 1 million years ago) and

1 million years ago) and survived the last ice age

An enormous amount of fossil material has been taken out of West Virginia

Adena culture's most lasting artifacts were substantial earthworks

the well-preserved cranium OH 5 (nicknamed "Nutcracker Man") was dated to 1

arranged chronologically

Diplocaulus, amphibian skull Styracosaurus 1 million years ago) andDiplocaulus was an early amphibian distinguished by a boomerang shaped head formed by two elongated bones at the back of the skull. This odd shape may have been used as a hydrofoil allowing it to swim against the current. It also would have made it difficult for predators to swallow. Diplocaulus was a tetrapod, an amphibian, a labyrinthodont, a lepospondyl, and a nectridian. Specs: Diplocaulus sp. Late Carboniferous to late Permian (270 m. y. a.).