Geological dating rocks. So, we start out with two isotopes of uranium that are unstable and radioactive.

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This causes induced fission of U, as opposed to the spontaneous fission of U.

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Intro to Astronomy:

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However, once rocks or fossils become much older than that, all of the "traps" in the crystal structures become full and no more electrons can accumulate, even if they are dislodged.

This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for fossils and rocks.

Fossils occur for a distinct, limited interval of time.

The disintegration products of uranium".

A series of related techniques for determining the age at which a geomorphic surface was created exposure datingor at which formerly surficial materials were buried burial dating.

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