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Uranium 235 decays to lead 207, and Thorium 232 decays to lead 208.

Unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence.

Uranium minerals themselves are too uncommon to be very useful in dating.

The most common dating method involves the use of minerals like zircon and monazite that are relatively common in granitic rocks.

The two cascades are different—235U becomes 207Pb and 238U becomes 206Pb.

What makes this fact useful is that they occur at different rates, as expressed in their half-lives (the time it takes for half the atoms to decay).

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