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The Cambrian is the first geological period of the Paleozoic Era, lasting from 542 to 488 or 1.7 million years ago (mya)
The dominent life form of this period was bacteria. -
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The Silurian is a geologic period and system that extends from the end of the Ordovician Period, about 443.7 to 1.5 million years ago (mya), This is also the time the planets came to form?
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The Devonian is a geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period, about 416.0 and 2.8. Differennt rocks formed.
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The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 and 2.5. Plants came around.
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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
