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25 Jan

Radiometric dating is a technique used to date materials based on a knowledge of the decay rates of naturally occurring isotopes, and the current abundances.

Various methods exist differing in accuracy, cost and applicable time scale All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.

Together with stratigraphic principlesradiometric dating methods are used in geochronology to establish the geological time scale.

By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.

James Ford - used seriation to determine the chronological order of American Indian pottery styles in the Mississippi Valley.Absolute dating * any method of measuring the age of an event or object in years.* To determine the absolute ages of fossils and rocks, * scientists analyze isotopes of radioactive elements.Radiometric dating is also used to date archaeological materials, including ancient artifacts.Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.