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Cambrian
First Paleozoic period from 538 MA to 486 MA
Ordovician
Second Paleozoic Period from 486 MA to 443 MA
Silurian
Third Paleozoic period from 443 MA to 419 MA
Devonian
4th Paleozoic Period, 419 MA to 358 MA
Carboniferous
5th Paleozoic Period, 358 MA to 298 MA
Permian
6th Paleozoic Period, 298 MA to 251 MA
Triassic
First Mesozoic period, 251 MA to 201 MA
Jurassic
2nd Mesozoic Period, 201 MA to 143 MA
Cretaceous
Third Mesozoic Period, 143 MA to 66 MA
Paleogene
First Cenozoic Period, 66 MA to 23 MA
Neogene
Second Cenozoic period, 23 MA to 2 MA
Quaternary
Third Cenozoic Period, 2 MA to Modern day