My father is a scientist and I used to talk to him about this. He brought up what seems to be a common misunderstanding about carbon dating. It is all comparative. Actually they do not know if what they say is 10 million years old is really ten million years old, but what they can (hopefully) say is that something 12 million years old is older than 10 million years old. Thus they start to create their own timeline which is "good to work with" but not always acknowledged as 100% accurate.

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Fraser,
Trinity Reformed Baptist Church
Hamilton, New Zealand.