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Cambrian period 570-500 mya
earliest record of marine life trilobites are dominant -
Orvovician period 500mya-450mya
echinoderms, vertebrates dominant,mollusks abundant. earliest fish dominant -
Silurian period 435mya-395mya
earliest plants,and animals arrive -
Devonian period395mya-345mya
armored fish go extinct, butseveral different species of fish. Earliest forms of amphibians form. -
Carboniferous period 345mya-280mya
lots of sharks and amphibians. -
the Permian period 280mya-225mya
extinction of many types of marine life including trilobites -
triassic period 225 mya-195mya
earliest dinosaurs, abundant of cycads -
Jurassic p[eriod 195mya-136mya
earliest of birds and mammals. abundance of dinosaurs -
Cretacious period136mya-65mya
Earliest flowering plants. the extinction of dinosaurs bony fish are thriving -
Tertiary period 65mya-1.8mya
placenta mammals,modern mammals, large running mammals -
Quarternary period 1.8mya-present
humans and mammals thrive