Multiple samples are just that – multiple samples. You cannot verify the age for sample 1 by checking the age for sample 2.
You can verify the age of a specific sediment by sampling several samples within that layer.
This is comparable to going into a room and checking the ages of the people therein by having one person ask each person his or her age and averaging out the ages to determine the age of those people in the room who were not asked.
What is wrong with that? If the average and sampling are incorrect, then you can disprove the earlier measurement by measuring the age of the other people in the room. It is still verifiable.
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