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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/