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Cenozoic | Quaternary:
Recent Epoch Pleistocene Epoch |
25,000 3,000,000 |
Tertiary:
Pliocene Epoch Miocene Epoch Oligocene Epoch Eocene Epoch Paleocene Epoch |
12,000,000 25,000,000 35,000,000 60,000,000 70,000,000 |
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Mesozoic | Cretaceous
Jurassic Triassic |
To 200,000,000 |
Paleozoic | Permian
Pennsylvanian Mississippian Devonian Silurian Ordovician Cambrian |
To 600,000,000 |
Proterozoic |
To 1,000,000,000 |
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Archeozoic |
To 1,800,000,000 |