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Last updated 2:39 PM on 4/7/26
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12 Terms
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Precambrian time
Earth forms
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Cambrian
shelled marine invertebrates appear.
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Ordovician
echinoderms appear.
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Silurian
land plants and animals appear.
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Devonian
Age of fishes begins.
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Carboniferous
amphibians flourish, giant cockroaches and dragonflies appear.
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Permian
pangea comes together
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Triassic
Dinosaurs appear
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Jurassic
Dinosaurs are the dominant life-form.
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Cretaceous
Flowering plants and modern birds appear.
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Tertiary
Age of mammals.
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Quatemary
complex human societies develop.
