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Cambrian
The Cambrian period was the beginning of the Paleozoic era, the earliest record of marine life. 570 M - 500 MYA -
Ordovician
Invertabrate were dominant, mpllusks became abundant. Earliest fish that are jawless and later, jawed and armored fish. 500 M - 435 MYA -
Silvrian
Eariest terrestrial plants and animals. Tiktaalik Eurypterids develop. 435 M - 395 MYA -
Devionian
Armored fish go extinct, but abundence of several species of ish. Earliest amphibians and ammonites. 395 M - 345 MYA -
Carboniferous
Abundant skarks and amphibians. Large swamps and coal forming forest. Earliest reptiles. 345 M - 280 MYA -
Permian
extinction of many types of marine animals including trilobites. 280 M - 195 MYA -
Triassic
Earliest dinosaurs, abundant cycads and conifers. 225 M - 195 MYA -
Jurassic
Earliest birds and mammals abundant dinosaurs and ammonites. 195 M - 136 MYA -
Cretaceous
Earlist flowering [plants, climax of dinosaurs followed by their extinction. Great decline of brochinopods. Abundant of bony fish. 136 M - 65 MYA -
Tertiary
Earlist placental mammals, modern mammals, large running mammals. 65 M - 1.8 MYA -
Quaternary
Large carnivors, neanderthals, humans, mastodon. 1.8 M - Present