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This means that a quartz sandstone deposited 500 million years ago will look very similar to a quartz sandstone deposited 50 years ago.Making this processes even more difficult is the fact that due to plate tectonics some rock layers have been uplifted into mountains and eroded while others have subsided to form basins and be buried by younger sediments.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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Relative time places events or formations in order based on their position within the rock record relative to one another using six principles of relative dating.

Relative time can not determine the actual year a material was deposited or how long deposition lasted; it simply tell us which events came first.

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