People carbon dating the history of life on earth

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Correlating radioisotope dating methods

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For teaching and sharing purposes, readers are advised to supplement these historic articles with more up-to-date ones suggested in the Related Articles and Further Reading below.Before 1955, ages for the Earth based on uranium/thorium/lead ratios were generally about a billion years younger than the currently popular 4.5 billion years. old Earth is reviewed and deficiencies of the uranium/lead method are discussed.Its results have been shown to be inconsistent, discordant, unreliable, and frequently bizarre in any model.Creationists have, in particular, pointed out the weak assumptions on which the method is based, and the contradictory nature of its results.A research consortium has recently convened at ICR to go further and develop a workable understanding of the radioisotope decay data from a young-earth perspective.The old-earth model doesn't work, and a better model must replace it. While most people usually think of radiocarbon dating (carbon 14), its short half life means it is only good for the upper part of the Quaternary, or the last 30,000 to 50,000 years because by then 98% of the radioactive carbon is gone.

Assumption One: The radioisotope decay rates have been constant throughout the past.

a popularly accepted “universal constant” even though the foundations on which it was based have been virtually removed.

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.

In 1972 this assumption was shown to be highly questionable.

Despite this, the momentum gained in the two decades prior to 1972 has made 4.5 b.y.