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For example, JJA Worsaae used this law to prove the Three Age System.

Seriation, on the other hand, was a stroke of genius.

The spontaneous fission of Uranium-238 has a known rate, as such the number of tracks is theoretically related to the age of the sample.In other words, artifacts found in the upper layers of a site will have been deposited more recently than those found in the lower layers.Cross-dating of sites, comparing geologic strata at one site with another location and extrapolating the relative ages in that manner, is still an important dating strategy used today, primarily when sites are far too old for absolute dates to have much meaning.[1] Because fission-track dating, requires a manual count of the fission-tracks, the process is more prone to human error and bias than other radiometric dating methods.This problem is increased by the fact that there are other types of crystal defects that can easily be counted as fission-tracks.

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