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The Cambrian period, at the beginning of the Paleozoic, was the first time that multicellular life forms flourished on Earth.
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This is the time period where starfish, sandollars, sea urchins, and sea cucumbers flourished. earliest fish as well came into the equation.
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Earliest terrestrial plants and animals. Tiktaalik
Eurypterids develop. -
Armored fish go extinct, but abundance of several species of fish. Earliest amphibians and ammonites.
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Abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns
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Extinction of many types of marine animals including trilobites.
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Earliest Dinosaurs, abundant cycads and conifers
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Earliest birds and mammals abundant dinosaurs and ammonites
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Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish.
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Earliest Placental Mammals, modern mammals, large running mammals
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Large Carnivores, Neanderthals, Humans, mastodons
