Discussion
The eons, eras and periods of the geological time scale are ordered from
Answer: C
Correct answer: longest to shortest division
The hierarchy runs eon, era, period, epoch and age, each a subdivision of the one before. So the Phanerozoic eon contains the Mesozoic era, which contains the Cretaceous period, which contains its own epochs. The ordering is by rank rather than by age.
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