Originally Posted by LindaLou
Radiometric dating of igenous rock dates the time at which is cooled and crystallised. Cosmogenic dating dates the amount of exposure to cosmic rays that rock or ice has undergone, in effect dating the amount of time the surface has been exposed. Those are two I know off the top of my head. The uranium dating in the Grand Canyon discussions is also a way of doing this.


So you prove my point. Their are variables that make it inacurate.

But what's funny about your claim about cooling off and crystallising is that volcanic rock should always date new because it has to cool after coming up from the mantle. Does this rock date new when dated after it cools?

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