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Cambrian period 570m-500m
earliest record of marine life. Trilobites are abundent during this time period. -
ordovicaian period
starfish, sand dollar, sea urchin, and sea cucumbers were a few species during this time. invertebrates are dominant, and molluks become abundant. The earliest fish were born and they were jawless, but they latere jawed and armored. This period started at 500m years and ended on 435m years. -
silurian period 435-395 mya
tiktaalik -
devonian period
the amored fish got extinct but abundance of several species of fish. earliest amphibiands and amomontities. this period started at 395m y7ears and ended at 345m years. -
carboniferous period 345-280 mya
reptiles scales trees seed ferns -
permian period 280-225 mya
pangea or the super continent -
triassic period 225-195 mya
earliest dinosaaurs and cycads and conifers -
Jurassic period 195-136 mya
earliest birds and mamals -
Cretaceous period136-65 mya
Age dinasaurs -
teritary period-65-1.8 mya
Age of mamals
