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During this process the pieces of the atom move apart at high speed, causing damage to the rock or mineral.
This damage is in the form of tiny marks called fission tracks.
Some of the isotopes used for this purpose are uranium-238, uranium-235 and potassium-40, each of which has a half-life of more than a million years.
Unfortunately, these elements don't exist in dinosaur fossils themselves.
In addition, the oldest known moon rocks are 4.5 billion years old.
Since the moon and the Earth probably formed at the same time, this supports the current idea of the Earth's age.
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This problem is now reduced by the careful collection of samples, rigorous crosschecking and the use of newer techniques that can date minute samples.The extreme temperatures of the magma would just destroy the bones.
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