Bolton's Geologic Time Scale Pages
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Precambrian Times
Paleozoic Era
Geologic Time: a record of life forms and geologic in earths history
Precambrian Time
-Paleozoic:
(Cambrian,Ordovician,Silurian,Devonian,
Carboniferous,Permian)
-Mesozoic:(Triassic,Jurassic,Cretaceous)
-Cenozoic:(Tertiary, Quaternary)
Bolton's Geologic Time Scale Pages