Ted, what you are apparently failing to recognize is that the dates overlap. It is important to understand that if a date is, say, 400Ma +/- 5Ma, the date isn't necessarily wrong by 5Ma. What we are saying with this terminology is that it is most likely that the mineral being dated formed within 5 million years of 400 million years ago. We're not giving an exact date, we're giving the range of most likely dates.I know that you are looking at these numbers in a relative manner, but friend, 1-5 million years is a long time to be wrong. Like I say, I understand that those with a scientific mind look at these numbers and say, "Oh, it's just a drop in the bucket compared to 357 million years and I would agree 100% that 5 million compared to 357 million in understanding the length of time is just a blink, but I'm not really interested in these numbers as a comparison and for me personally, even if you're looking at a period 347 million years ago, to be wrong by as much as 5 million years regarding the dating of something, is a very long, long time.
The point that the young man was trying to make was that the dates he gave OVERLAP. This gives us even greater certainty that a particular range is valid. For example, if the ranges of the 3 techniques are represented by these three lines:
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then all three of the techniques agree on the range covered by the smallest line, so it is most likely that the mineral formed during this time. In other words, in the example he gave, all the techniques agreed on a 2 million year range. That range is less than 1% of the absolute age, which is a rather good margin of error indeed. It certainly isn't perfect, on this we agree, but less than 1% error is pretty close, and I think we can agree on that too.
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