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Posted by Sam Patterson on September 25, 2002 14:48:26 UTC

Here is a link about Potassium-Argon dating and it shows that this is not a reliable form of dating.

Also, here are some assumptions being made when they 'date' a rock.


The isotope concentrations can be measured very accurately, but isotope concentrations are not dates. To derive ages from such measurements, unprovable assumptions have to be made such as:

1. The starting conditions are known (for example, that there was no daughter isotope present at the start, or that we know how much was there).

2. Decay rates have always been constant.

3. Systems were closed or isolated so that no parent or daughter isotopes were lost or added."

If any of these assumptions is wrong, the age of the rock is wrong. How can they know if these assumptions are correct?


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