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(The range of uncertainty varies, and may be as much as an order of magnitude different from the approximate value above.

It depends on the accuracy of the measurements and the fit of the data to the line in each individual case.) For example, with Rb/Sr isochron dating, any age less than a few tens of millions of years is usually indistinguishable from zero.

especially in absence of cross-checks by different methods, or if presented without sufficient information to judge the context in which it was obtained.

Isochron methods avoid the problems which can potentially result from both of the above assumptions.

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Consider some molten rock in which isotopes and elements are distributed in a reasonably homogeneous manner.When you first create a master or administrator account on a new Windows install, you will be asked whether you want updates to download and install automatically, or if you want to do this manually.Many performance problems can simply be tracked down to too much overhead and too few resources.Isochron dating requires a fourth measurement to be taken, which is the amount of a different isotope of the same element as the daughter product of radioactive decay.(For brevity's sake, hereafter I will refer to the parent isotope as ).

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