-
245
Triassic period: 245 million years ago
The first dinosaurs such as Coelophosis and Euskelosaurus, and mammals, turtles, crocodiles and frogs appeared. -
360
period: (360 million years ago)
The first reptiles appeared. Great swamp forests covered the land. -
505
Ordovician period: (505 million years ago)
The first nautiloids appeared. Corals and trilobites were common. -
570
Cambrian period: (570 million years ago)
The first fishes, corals, trilobites and shellfish appeared. -
Silurian period: (438 million years ago)
The first land plants and giant sea scorpions called Eurypterids appeared. -
Devonian period: (408 million years ago)
The first amphibians, insects and spiders appeared -
Permian period: (286 million years ago
The first sailback reptiles such as Dimetrodon (right) appeared.
