A Geologic Timeline

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Millions
of years
Ago

ERA

PERIODS
65 Million

Cenozoic

(The Age of Mammals)

Quaternary
Tertiary
230 Million

Mesozoic

(The Age of Reptiles)

Cretaceous
Jurassic
Triassic
570 Million

Paleozoic

(The Age of Fish)

Permian
Pennsylvanian
Mississipian
Devonian
Silurian
Ordovician
Cambrian
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