Palaeozoic Era (570 million to 245 million years ago)
Mesozoic Era (245 million to 65 million years ago).
Each of these eras is divided up into sections called periods.
Palaeozaic era (say pal-ay-oh-zoh-ick)
Cambrian period: (570 million years ago)
The first fishes, corals, trilobites and shellfish appeared.
Right: Fossil trilobites
Ordovician period: (505 million years ago)
|The first nautiloids appeared. Corals and trilobites were common.||
A fossil nautiloid
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.||
Fossil of a plant called Archaeopteris from the Devonian period
|5. Carboniforous period: (360 million years ago)||The first reptiles appeared. Great swamp forests covered the land.||
Permian period: (286 million years ago)
|The first sailback reptiles such as Dimetrodon (right) appeared.||
|1. Triassic period: 245 million years ago||The first dinosaurs such as Coelophosis and Euskelosaurus, and mammals, turtles, crocodiles and frogs appeared.|
|2. Jurassic period: (208 million years ago)|| The first
birds appeared (e.g. Archaeopteryx).
Dinosaurs included diplodocus, stegasaurus, brachiosaurus.
|3. Cretaceous period: (144 million years ago)||Dinosaurs during this time included muttaburrasaurus, quetsalcoatlus, ankylosaurus. The dinosaurs died out towards the end of this period.The first snakes and modern mammals appeared.|
Following the Mesozoic era was the Cenozoic (say sen-oh-zoh-ick) era (65 million to 0 million years ago), during which many different species of animals appeared. This era ended with the Great Ice Age and the appearance of the first humans.
Go here for a timeline with information about each era
Back to Dinosaur index
Back to Animals
updated October 2013©www.kidcyber.com.au