To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. With absolute age dating, you get a real age in actual years.
The relative and the absolute age of rocks and fossil records provide evidence of the earths geographic history through the use of radiometric dating methods.
The dating methods that the geologists make use of are usually based on radioactive dating.
The natural decay of the elements or the compounds that are found in the objects are used as reliable sources of information to date the history of such happenings.
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