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    Chronometric dating in archaeology

    Chronometric dating, also known as chronometry or absolute dating, is any archaeological dating method that gives a result in calendar years before the present time.

    Archaeologists and scientists use absolute dating methods on samples ranging from prehistoric fossils to artifacts from relatively recent history.

    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.

    The scholar most associated with the rules of stratigraphy (or law of superposition) is probably the geologist Charles Lyell.

    The basis for stratigraphy seems quite intuitive today, but its applications were no less than earth-shattering to archaeological theory.

    SYNONYMS OR RELATED TERMS: amino-acid dating; aminostratigraphy; amino-acid racemization, amino acid racemization CATEGORY: technique DEFINITION: A method of absolute (chronometric) dating which is hoped to fill the gap between radiocarbon dates and potassium-argon dates.

    It is used for human and animal bone and other organic material.

    For more information on stratigraphy and how it is used in archaeology, see the Stratigraphy glossary entry.

    Specific changes in its amino acid structure (racemization or epimerization) which occur at a slow, relatively uniform rate, are measured after the organism's death.

    The basis for the technique is the fact that almost all amino acids change from optically active to optically passive compounds (racemize) over a period of time.

    Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.

    Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.

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