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SCi geo time

Cambrian Great explosion of life
Ordovician Warm, Shallow seas cover much of earth
Silurian Fish with jaws
Devonian Trilobites
Carboniferous Appalachian mountains began to form
Permian Reptiles become dominant on land
Triassic First dinosaurs appeared
Jurassic First birds appeared
Cretaceous Wide spread of volcanoes
Tertiary Continental glacier covers Antarctica about 25 million years ago
Quaternary The great lakes formed
Created by: alowe
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