Dimetrodon, track Iguanodon 800 foot thick layer of

800 foot thick layer of claystone

in the marine deposits of the Edwardsville Formation

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

Evolution of Plant Life

Dimetrodon, track Iguanodon 800 foot thick layer ofDimetrodon track Dimetrodon (meaning two measure teeth) was a sail backed, meat eating animal that lived during the Permian Period, roughly 280 MYA years ago, before the dinosaurs evolved. It was a so called mammal like reptile, a pelycosaur; pelycosaurs were the ancestors of the mammals. Dimetrodon was a dominant carnivore during the Permian period, living mainly in swampy areas. Unlike their fellow non finned pelycosaurs, they warmed up early after