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cambrian period 570m-500m
earliest record of marine life. Trilobites are abundant during this time period. this period started at 570m and ended on 500m. -
ordovician period
starfish, sand dollar, sea urchin, and sea cucumbers were a few species during this time. invertebrates are dominant, and mollusks became abundant. the earliest fish were born and they were jawless, but later jawed and armored. this period started at 500m years and ended on 435m years. -
Silurian period
earliest terrestrial plants and animals, and the tiktaalik eurypterids develop. started at 435m years and ended at 335m years. -
devonian period
the armored fish go extinct, but abundance of several species of fish. earliest amphibians and amomonities. this period started at 395m years and ended at 345m years. -
carbonferous period
abundant sharks and amphibians. there was large swamps and coal forming forests. reptiles started inhabiting the earth. 345m-280m -
permian period
extinction of many types of marine animals including trilobites. 280m-225m -
triassic period
earlies dinosaurs, abundant cycads and conifers -
Jurassic period
earliest birds and mammals abundant dinosaurs and ammonities. -
cretacious period
earliest flowering plants. climax of dinosaurs followed by their extinction. great decline of brachiopods. abundance of bony fish.
