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Cambrian 570-500 MYA
Triolibites were dominent, and al of Earth was oceans with emerging of small granite contenints. All life was marine. -
Ordovician 500-435
Echinoderms (starfish, sand dollars, sea urchins and sea cucumbers) also invertebrates are dominant at this time, mollusks became abundant, the earliest fish that were jawless and later, jawed and armored fish. -
Silurian 435-395
Earliest terrestrialplants and animals, tiktaalik eurypterids develop -
Devonian 395-345
Armored fish go extinct, but abundance of several species of fish, earliest amphibians and ammonites -
Carboniferous 345-280
abundant sharks and amphibians, large swamp and coal forming forests earliest reptiles, scale treess and seed ferns. -
Permian 280-225
Extenction of many types of marine animals including trilobites -
Triassic 225-195m
Earliest dinosaurs, abundant cycasand conifers -
Jurassic 195-136m
earliest birds and mammals abundant dinosaurs and ammonites -
Cretaceous 136-65
earliest floweing plants, climas of dinosaurs, followed bbu their extinction great decline of brachipods. abundance of bony fish -
Tertiary 65-1.8
earliest placental mammals, modern mammals, large runnong mammals. -
Quaternary 1.8- present
LArge carnivores, neanderthals, humans, mastodons
