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Below is a chart of commonly used radiometric isotopes, their half-lives, and the daughter isotopes they decay into.

The date on a coin is an absolute date, as are AD 1492 or 501 SYNONYMS OR RELATED TERMS: absolute dating; chronometry CATEGORY: technique DEFINITION: Any technique of dating that relies on chronological measurement such as calendars, radiocarbon dates, etc.

and which give the result in calendar years before the present, or B. Most of these techniques produce results with a techniques do not.

The best radioactive element to use to date human fossils is Carbon-14.

There are several reasons why, but the main reasons is that Carbon-14 is a naturally occurring isotope in all forms of life and its half-life is about 5730 years, so we are able to use it to date more "recent" forms of life relative to the Geologic Time Scale.

This term refers to the relation of one stratigraphical unit to another, by petrological, osteological, lithographic, cultural, chronological, or palaeontological means.

For example, stratigraphic units may be correlated using palaeontological criteria, methods, and position relative to the glacial-interglacial cycle by examining physical and biological attributes.

Other methods include: coin dating, seriation, and amino-acid racemization.