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Because fossils actually record the slow but progressive development of life, scientists use them to identify rocks of the same age throughout the world.
Hutton, a Scottish geologist, first proposed formally the fundamental principle used to classify rocks according to their relative ages.AA(Laboratory of Archaeometry, University of the Aegean, Dept. of Mediterranean Studies, Demokratias Ave, Rhodes 85100) AB(Archaeometry Laboratory, Cultural and Educational Technology Institute (C. Chronological sequence is all that is really required.However, human beings love to see factual precision, and we want to know how old something is.
Be sure to see An Animated Isochron Diagram, or, Watching a Rock Age on an Isochron Diagram. Radiometric Dating from The Evolution Evidence Page.