# Dating on th

For further information on fitting of lines to data (also known as regression analysis), see: Note that the methods used by isotope geologists (as described by York) are much more complicated than those described by Gonick.

This will be discussed in more detail in the section on Gill's paper below.

Its composition would be represented as a single point on the isochron plot: Note that the above is somewhat simplified.

There are minor differences between isotopes of the same element, and in relatively rare circumstances it is possible to obtain some amount of differentiation between them. The effect is almost always a very small departure from homogeneous distribution of the isotopes -- perhaps enough to introduce an error of 0.002 half-lives in a non-isochron age. but it is rare and the effect is not large enough to account for extremely old ages on supposedly young formations.) as minerals form.

The data points would be expected to start out on a line if certain initial conditions were met.

Consider some molten rock in which isotopes and elements are distributed in a reasonably homogeneous manner.

That encompasses the entire young-Earth timescale thousands of times over." in the decay equation.

Age "uncertainty" When a "simple" dating method is performed, the result is a single number.

Unfortunately, one must wade through some hefty math in order to understand the procedures used to fit isochron lines to data.General comments on "dating assumptions" All radiometric dating methods require, in order to produce accurate ages, certain initial conditions and lack of contamination over time.The wonderful property of isochron methods is: if one of these requirements is violated, it is nearly certain that the data will indicate the problem by failure to plot on a line.The equation is the one which describes radioactive decay: If one of these assumptions has been violated, the simple computation above yields an incorrect age.Note that the mere existence of these assumptions do not render the simpler dating methods entirely useless.

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