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Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

Geochronologists do not claim that radiometric dating is foolproof (no scientific method is), but it does work reliably for most samples.

It is these highly consistent and reliable samples, rather than the tricky ones, that have to be falsified for "young Earth" theories to have any scientific plausibility, not to mention the need to falsify huge amounts of evidence from other techniques.

Nineteenth century geologists recognized that rocks formed slowly as mountains eroded and sediments settled on the ocean floor.

But they could not say just how long such processes had taken, and thus how old their fossils were.

The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.

As an example of how they are used, radiometric dates from geologically simple, fossiliferous Cretaceous rocks in western North America are compared to the geological time scale.

To get to that point, there is also a historical discussion and description of non-radiometric dating methods.

Darwin had argued that the Earth was immensely old — which gave his gradual process of evolution plenty of time to unfold.

The great physicist Lord Kelvin had countered that the planet was actually relatively young — perhaps 20 million years old.