How much of your life do you spend thinking about time? Time comes in different forms in geology, mainly absolute and relative.
They are both important in terms of Earth's history and its geological timeline, and they work together in concert to build the planet's geological record.
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It is important to realize that with new information about subdivision or correlation of relative time, or new measurements of absolute time, the dates applied to the time scale can and do change.
Revisions to the relative time scale have occurred since the late 1700s.
Think of relative time as physical subdivisions of the rock found in the Earth's stratigraphy, and absolute time as the measurements taken upon those to determine the actual time which has expired.