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These hard tissues include the teeth and the bones.This technique begins with the identification of the bones.Archeology refers to the study of history of mankind by excavating ancient sites.The methods used for relative dating in archeology are similar to the ones used in geology.The absolute age of these events need not inevitably be known.Grand Canyon is a gorge located in Northern Arizona, USA. While some of the layers are uplifted, most of the landform is left undisturbed by nature.
Strata is the layered arrangement or soil or rocks which lie parallel, one above the other.These fossils are then used as standards to determine the age of other fossils. An example can be fossils of some species of monkeys found alongside fossils of human species.This technique of relative dating mainly works on the principle of chemical changes taking place in the fossils.When remains of living beings get buried into sediments and turn to fossils, the bacteria present in the soil breakdown the proteins and fats from the bones.Most of the nitrogen contained in these fossils gets depleted progressively.