Only one sample is required for this method as both the argon-39 and argon-40 can be extracted from the same sample.
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 technique is, however, useful for providing relative dates for objects found at the same site.
Another useful chemical analysis technique involves calculating the amount of nitrogen within a bone.
This damage is in the form of tiny marks called fission tracks.