Radio isotope dating methods
There is no absolutely reliable long-term radiological 'clock'." "The age of our globe is presently thought to be some 4.5 billion years, based on radio-decay rates of uranium and thorium.
Such ‘confirmation’ may be shortlived, as nature is not to be discovered quite so easily.
Age estimates which are obviously wrong or contradictory are sometimes produced.
A popular and supposedly foolproof method was used on two lava flows in the Grand Canyon that should be ideal for radioactive age estimation. Young basalt rock at the Canyon's top produced an age estimate 270 million years older than ancient basalt rock at the Canyon's bottom.
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Despite this, the momentum gained in the two decades prior to 1972 has made 4.5 b.y.It disintegrates at a measured rate into calcium and argon.