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Additionally, elements may exist in different isotopeswith each isotope of an element differing in the number of neutrons in the nucleus.
Chapter 8 Measuring Geological Time 8.
Updated 26 March c Introduction In a related article on Isochron Dating Lab Limit ages Ageswe presented a chart with the various geologic eras and their ages. In a separate article Radiometric datingwe sketched in some technical detail how these dates are calculated using radiometric dating techniques.