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Define relative dating techniques

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Between the years of 17, James Hutton and William Smith advanced the concept of relative dating.

Hutton, a Scottish geologist, first proposed formally the fundamental principle used to classify rocks according to their relative ages.

Seriation uses the assumption that once a tool was developed, its use would become more widespread.In the past, relative dating methods often were the only ones available to paleoanthropologists.As a result, it was difficult to chronologically compare fossils from different parts of the world.For instance, if we find a fossil bone below the strata 3 rock level shown above, we assume that the animal most likely lived at a time before that layer was formed.However, we must be careful to note whether or not the fossil comes from the mixed strata zone of the filled in hole..However, the assumption of contemporaneity may not always be correct.