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From the mapped field relationships, it is a simple matter to work out a geological cross-section and the relative timing of the geologic events.
His geological cross-section may look something like Figure 2.
This is consistent with the assumption that each decay event is independent and its chance does not vary over time.
where is the half-life of the element, is the time expired since the sample contained the initial number atoms of the nuclide, and is the remaining amount of the nuclide.
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.