second part to the history of life
The History Of Life
Permian Period (300mya-250mya)
Mammal like reptiles called therapsids dominated the land during this period and included snail backed forms. They were almost entirely wiped out by a massive extinction event at the end of the period along with 95% of other species.
Triassic Period (250mya-200mya)
The permian extinction allowed true reptiles to evolve into many different forms during this period and they became the main predators in the sea and air as well as on land. The first dinosaurs appeared towards the end of this period.
Jurassic Period (200mya-145mya)
During this period dinosaurs diversified into many different forms such as Stegosaurus and Brachiosaurus and dominated life on land.
Cretaceous Period (145mya- 65mya)
Dinosaurs continued to be very successful during this period with the appearence of large predatory forms such as Tyrannosaurus but at the end of the period they were wiped out possibly by meteorite impact.
Palaeogene Period (65mya-22mya)
The extinction of the end of the Cretaceous period allowed mammals to evolve into many different forms both on land and in the sea. Birds were also very successful during this period dominating the skies.
Neogene Period (25mya-0mya)
Modern man first appeared towards the end of this period and spread over the World during the Ice Age. In Northern Europe mammoths were a major source of food.