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cambrien period 570-500 mya
This is the oldest period known to man. It is about 5 times longer than the paleozoic and the mesozoic periods combined.Periods within the cambrien:Proterozoic, Archean -
Period: to
paleozoic era
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ordovician period 500-435 mya
Invertabrates are dominant, mollusks become abundant, and later on some jawless and armored fish come into the world. -
silurian period 435-395 mya
Earliest terrestrial plants and animals. -
devonian period 395-345 mya
Armored fish go extinct but abundance of several species of fish. Earliest amphibians and ammonites. -
carboniferous period 345-280 mya
Some sharks and amphibians with large swamps and coal forming forests. -
permian period 280-225 mya
Extinction of many types of marine animals including trilobites. -
Period: to
mesozoic era
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triassic period 225-195 mya
Earliest dinosaurs, abundant cycads and conifers. -
jurassic period 195-136 mya
Earliest birds and mammals, abundant dinosaurs and ammonites. -
cretaceous period 136-65 mya
Climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish. -
Period: to
cenozoic era
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tertiary period 65-1.8 mya
Earliest Placental Mammals, modern mammals, large running mammals. -
quaternary period 1.8-present
Humans and all the other well known mammals appear.
