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Cambrian Period
earliest records of marine life- trilobites are dominant -
Ordovician Period
starfish, sandollar, sea urchin and sea cuccumbers. invertebrates are dominant, mollusks became ubundant. the earliest fish are jawless and later jawed and armored fish -
Silurian Period
Earliest terrestrial plants and animals tiktaalik eurypterids develop -
Devonian Period
armored fish go extinct but abundance of several species of fish. Earliest amphibians and ammonites -
Carboniferous
abundant sharks and amphibians. large swamps and coal forests -
Permian period
extinction of many species of marine life including trilobites -
Triassic Period
Earliest dinosaurs, abundant cyclads and conifers -
Jurassic Period
Earliest birds and mammals and abundant dinosaurs and ammonites -
Cretaceous Period
Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline in brachiopods and an abundance of bony fish -
Tertiary Period
earliest placental mammals, large running mammals, and modern mammals -
Quaternary Period
large canivors, mammals, neanderthals, humans, mastodons
