Eras of the Earth

By. Lorelei Ing

Precambrian time

The first sedimentary rocks were formed more than 3.8 billion years ago

Earth was form 4.6 billion years ago The earliest living creatures were

microscopic bacteria

Cambrian

During this time period the animals are more evolved and more diverse with features such as hard shells and they were able to hunt, burrow and crawl

Trilobite fossil

Some of the earliest creatures

Ordovician

This period lasted nearly 43 million years and known for there diverse marine invertebrates which were mainly trilobites

Silurian

Earth’s sea levels raised due to the melting of glaciers

Scientist have also discovered that this showed the first clear evidence of life on land and giant sea scorpions

Devonian

This was a important stage in the evolution on life because the first vertebrates were starting to come out of the water and we had the first wingless bugs.

The two supercontinents Gondwana and Euramerica collided then made one supercontinent know as Pangea.

Carboniferous

Carboniferous had many swaps that then over time created coal

Permian

A great portion of the marine invertebrates animals had been extinct

At that time the only continent that was separate from the others is what is know Asia

Triassic

This is the time when the supercontinent known as Pangea was altering its ocean circulation and global climate

Jurassic

dinosaurs are walking on the land and they mainly eat the ferns The oceans are filled with

squid and ammonites There are the first birds too

exist

Cretaceous

This is the time period when there was the first fossils of the more recent mammals, certain groups of birds and some flowering plants.

a fossil of a bird

Paleogene

The dinosaurs and marine mammals had been died completely out and instead rodents appeared

Neogene

Mountains began to arise Since it was so cold certain species

died out Animals like elephant and apes

traveled from Africa to Eurasia

Quaternary

The supercontinent Pangea had began to break up

The mammals were beginning to have fur coat.

Information from

Info on Cambrianhttp://www.bbc.co.uk/nature/history_of_the_earth/Cambrian Info on Ordovician

http://www.ucmp.berkeley.edu/ordovician/ordovician.php Info on Silurian

http://www.ucmp.berkeley.edu/silurian/silurian.php Info on Devonian

http://www.ucmp.berkeley.edu/devonian/devonian.php Info on Carboniferous

http://www.ucmp.berkeley.edu/carboniferous/carboniferous.php Info on the Permian

http://www.ucmp.berkeley.edu/permian/permian.php

And from

Precambrian fromhttp://science.nationalgeographic.com/science/prehistoric-world/precambrian/Triassic fromhttp://www.ucmp.berkeley.edu/mesozoic/triassic/triassic.htmlJurassic fromhttp://www.ucmp.berkeley.edu/mesozoic/jurassic/jurassic.phpCretaceous fromhttp://www.ucmp.berkeley.edu/mesozoic/cretaceous/cretaceous.phpPaleogene fromhttp://science.nationalgeographic.com/science/prehistoric-world/paleogene/Neogene fromhttp://science.nationalgeographic.com/science/prehistoric-world/neogene/#close-modalQuaternary from http://science.nationalgeographic.com/science/prehistoric-world/quaternary/