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Cambrian Period 570-500 MYA
Earliest Marine Life recorded. Abundent amount of Trilobites -
Ordovidan 500-435 MYA
Echinoderms ( Starfish, Sand dollar , sea urchin and sea cucumbers). Invertebrates are dominant, mollusks become abundant. Earliest Fish that are Jawless and later, jawed and armored fish. -
Silurian 435M-395M
Earliest terrestrial plants and animals. Tiktaalik
Eurypterids develop -
devonian 359M-354M
Armored fish go extinct, but abundance of several species of fish. Earliest amphibians and ammonites. -
Carbonian 345M-280M
Abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns -
Permian 280M-225M
Extinction of many types of marine animals including trilobites. -
Triassic 225M-195M
Earliest Dinosaurs, abundant cycads and conifers -
Jurassic 195M-136M
Earliest birds and mammals abundant dinosaurs and ammonites -
Cretaceous 136M-65M
Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish. -
Tertiary 65M-1.8M
Earliest Placental Mammals, modern mammals, large running mammals -
Quaternary 1.8M-Present
Large Carnivores, Neanderthals, Humans, mastodons