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By combining knowledge gained using both relative and absolute dating processes geologists have been able to produce the geologic time scale.Put simply, if a geologist says to be younger than his or her colleague, that is a relative dating.If a geologist says to be 28 years old, that is an absolute dating.This process lead to a system of time containing eons, eras, periods, and epochs all determined by their position in the rock record.For example, rocks of the Phanerozoic eon are found on top of rocks from the Proterozoic eons therefore rocks of the Phanerozoic are younger than rocks of the Proterozoic.

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