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As an example of how they are used, radiometric dates from geologically simple, fossiliferous Cretaceous rocks in western North America are compared to the geological time scale.To get to that point, there is also a historical discussion and description of non-radiometric dating methods.These are often characterised as the norm, rather than the exception.

This belief in long ages for the earth and the existence of life is derived largely from radiometric dating.Radioactive Dating Methods I am Kevin Rogers and am the director of Reasonable Faith Adelaide.Last year we held a number of meetings on the young/old earth issue and gave YECs numerous opportunities to speak.These long time periods are computed by measuring the ratio of daughter to parent substance in a rock and inferring an age based on this ratio.This age is computed under the assumption that the parent substance (say, uranium) gradually decays to the daughter substance (say, lead), so the higher the ratio of lead to uranium, the older the rock must be.

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