There are four basic divisions of geologic time. In order from the largest amount of time to the smallest, these divisions are called eons, eras, periods, and epochs.
PHANEROZOIC EON
CENOZOIC ERA (age of mammals)
-Quaternary Period
-Tertiary Period
MESOZOIC ERA (age of reptiles)
-Cretaceous Period
-Jurassic Period
-Triassic Period
PALEOZOIC ERA (explosion of life forms)
-Permian Period
-Carboniferous Period
-Devonian Period
-Silurian Period
-Ordovician Period
-Cambrian Period
PRECAMBRIAN EON: Proterozoic/Archean
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