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Cambrian Period 570-500 MYA
The abundant animals of this time were trilobites and burgess shales. It was the beginning of the race to survive and evolve. -
Ordovician Period 500 - 450 MYA
The abundant animals in this time were trilobites. Glaciation was non-existant as the carbon dioxide levels were seven times higher back then, than they are today. -
Silurian 450 - 415 MYA
The dominant species during this time period were: trilobites, mollusks, giant sea scorpions, and the first relatives of spiders and centipedes on land. -
Devonian Period 415 - 365 MYA
Gondwana dominated as a supercontinent; placoderms such as the dunkleosteus dominated with trilobites until the end of the Devonian that followed the extinction of placoderms and trilobites. -
Carboniferous 365 - 290 MYA
The Carboniferous period was named after the massive amounts of coal, oil, and carbon dioxide was on the Earth at the time. The dominant creatures were giant insects, centipedes, arachnids, and everything in-between. -
Permian Period 290 - 240 MYA
Towards the end of this period would spell the greatest mass extinction in recorded history. 96% of all life went extinct during this time, and this was also the end of the Paleozoic Era. -
Triassic Period - Mesozoic Era 240 - 190 MYA
The beginning of the Mesozoic Era. Life took milions of years during this time to recover from the previous Permian extinction. Pangea takes it's place as the most famous supercontinent to date. -
Jurassic Period 190 - 139 MYA
The first birds started to appear. The Earth was dominated by massive reptiles, and most life was hostile. -
Cretaceous Period 136 - 65 MYA, End of Mesozoic
Most of the large dinosaurs died at the end of this period during the K-Pg Event. Tons of bird species flourished during this time, and the smaller creatures that survived were the mammals that remained underground or in secluded areas. -
Tertiary Period, Cenozoic Era, 65 - 1.8 MYA
Earliest Placental mammals, modern mammals, and large mammals. This is also the longest-known period of all previous eras. -
Quaternary Period 1.8 MYA - Today.
Humans started to appear, as well as large carnivores. The evolution of intelligence had begun.
