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earliest record of marine life. Trilobites are abundant during this time period. this period started at 570m and ended on 500m.
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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.
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earliest terrestrial plants and animals, and the tiktaalik eurypterids develop. started at 435m years and ended at 335m years.
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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.
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abundant sharks and amphibians. there was large swamps and coal forming forests. reptiles started inhabiting the earth. 345m-280m
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extinction of many types of marine animals including trilobites. 280m-225m
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earlies dinosaurs, abundant cycads and conifers
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earliest birds and mammals abundant dinosaurs and ammonities.
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earliest flowering plants. climax of dinosaurs followed by their extinction. great decline of brachiopods. abundance of bony fish.
