As far as uranium dating there are alot of factors.

1. the rock has to be free from lead at the beginning. *This is usually not the case; there is some lead to start with. This gives the rock what is called a built-in age, something more than zero.

2. We assume that the uranium was tightly sealed in the rock so that nothing could get in or out. Sometimes this may be true but not always. Over long periods of time, some of the lead or the uranium might seep out into groundwater. Or more uranium or lead might get in, especially if it is a sedimentary rock. For this reason, the uranium-lead clock works best on igneous rocks.

3.Other complications arise from the fact that another element, thorium, which may be in the mineral, is also radioactive and slowly disintegrates into lead. Besides that, uranium has a second isotope—the same chemically but different in mass—that decays at a different rate, also forming lead. Each of these ends up in a different isotope of lead.

So Like I said a guess at best


1999 Silver Frost SVT
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