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the cambrian period was from about 570 mya- 500 mya. during this period was the earliest record of marine life. Trilobites are dominent.
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ordovian is from about 500 mya- 435 mya. during this period was echinoderms (starfish, sandollors, sea urchans, and see cucumbers.) invertabites are dominent , mullusks become abundant. earliest fish that are jawless and later jawed and armerd fish.
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the sulurian time period was about 435mya-395mya. during this time was the earliest terrestrial plants and animals. tiktaalik eurypterids develop.
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the devonian tim period was baout 395mya-345mya. during this time armored fish go extinct but abundance of several species of fish.
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this time period was about 345mya-28mya. abundant sharks and amphibians large swamps and coal forming forest earlies.( reptiles, scale trees, and seed ferns).
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280mya-225mya. this time period was full of extinction of many types of marine animals including tributes.
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225mya-195mya. this era were the earliest dinosaurs, abundant cycads and conifers.
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195mya-136mya. this era was the earliest birds and mammals abundant dinosaurs and ammonites.
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136mya-65mya. earliest floering plants, climax of dinosaurs followed by their extinction great decline of brachiopods. abundance of bony fish.
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1.8mya- today. large carnivores, neanderthals, humans, mastodons.
