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This newer method converts a stable form of potassium (potassium-39) into argon-39.Measuring the proportions of argon-39 and argon-40 within a sample allows the age of the sample to be determined.
It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.
The technique can, however, provide the relative ages of bones from the same site.
Most fossils are found in sedimentary rocks deposited in layers.
This damage is in the form of tiny marks called fission tracks.
When volcanic rocks and minerals are formed, they do not contain fission tracks.