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The Cambrian was the first geological period of the paleozoic era. The Cambrian lasted about 55.6 million years.
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The Ordovician period occured almost 45 million years ago, Beginning 488.3 million years ago and ending 443.7 million years ago. During this period the world was almost mostly ocean.
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The Silurian Period was the earliest to contain terrestrial plants and animals. Occurred from 443 million to 416 million years ago. It was the third period in the Paleozoic Era.
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The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago to the beginning of the Carboniferous, 358.9 Mya
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Abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns started to grow
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The Permian is a geologic period and system which spans 46.7 million years from the end of the Carboniferous Period 298.9 million years ago, to the beginning of the Triassic Period 252.2 Mya. 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
