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In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.
As we pointed out in these two articles, radiometric dates are based on known rates of radioactivity, a phenomenon that is rooted in fundamental laws of physics and follows simple mathematical formulas.
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In 1972 this assumption was shown to be highly questionable.
Some evidence is also presented to show that radiometric results that are in agreement with the accepted geological time scale are selectively published in preference to those results that are not in agreement.If the sample behaved as a closed system then graphing the difference between the present and initial ratios of Pb should produce a straight line.The distance the point moves along this line is dependent on the U/Pb ratio, whereas the slope of the line depends on the time since Earth’s formation. The development of the Geochron was mainly attributed to Clair Cameron Patterson’s application of Pb-Pb dating on meteorites in 1956.The geological time scale and an age for the Earth of 4.5 b.y.In a related article on geologic ages (Ages), we presented a chart with the various geologic eras and their ages.