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Cambrian 570 - 500 MYA
The Cambrian period, at the beginning of the Paleozoic, was the first time that multicellular life forms flourished on Earth. -
Period: to
Geologic Timescale
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Ordovician 500-435 MYA
This is the time period where starfish, sandollars, sea urchins, and sea cucumbers flourished. earliest fish as well came into the equation. -
Silurian 435-395 MYA
Earliest terrestrial plants and animals. Tiktaalik
Eurypterids develop. -
Devonian 395-345 MYA
Armored fish go extinct, but abundance of several species of fish. Earliest amphibians and ammonites. -
Carboniferous 345-280 MYA
Abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns -
Permian 280-225 MYA
Extinction of many types of marine animals including trilobites. -
Triassic 225-195 MYA
Earliest Dinosaurs, abundant cycads and conifers -
Jurassic 195-136 MYA
Earliest birds and mammals abundant dinosaurs and ammonites -
Cretacious 136-65 MYA
Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish. -
Tertiary 65-1.8 MYA
Earliest Placental Mammals, modern mammals, large running mammals -
Quaternary 1.8 MYA-Present
Large Carnivores, Neanderthals, Humans, mastodons