There was no way to calculate an "absolute" age in years for any fossil or rock layer. Following the Principle what is relative age dating
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say that whatever forces caused the deformation, like an earthquake, must have occurred after the formation of all the rock strata. Existent age dating—assigning an age to materials—is an entire discipline of its own. Email is not a valid email. Popular Lessons What Are Tissues. Lesson Summary Geologists establish the relative ages of rocks mostly through their understanding of stratigraphic succession. Sedimentary rocks in particular are notoriously radioactive-free zones.