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The narrower a range of time that an animal lived, the better it is as an index of a specific time.

If a rock has been partially melted, or otherwise metamorphosed, that causes complications for radiometric (absolute) age dating as well.In this case, it is a big advantage to present the data in a form in which the abundance of both the parent and daughter isotopes are given with respect to the abundance of the initial background daughter.The incremental additions of the daughter type can then be viewed in proportion to the abundance of parent atoms. It has already been shown— In practice, the isochron approach has many inherent advantages.In a way this field, called geochronology, is some of the purest detective work earth scientists do.There are two basic approaches: relative age dating, and absolute age dating.

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