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This involves circular reasoning, as is clearly evident in the article on dating in the Encyclopedia Britannica: Most geologists must rely on geochronologists for their results.
In turn, the geochronologist relies on the geologist for relative ages.
A similar problem occurs with radiometric dating of rocks.
Since the initial physical state of the rock is unknowable, the age can only be estimated according to certain assumptions.
However, there is no way to independently test these assumptions.
If they are wrong, the method could yield faulty dates that might be far too old.
There has been in recent years the horrible realization that radio-decay rates are not as constant as previously thought, nor are they immune to environmental influences.