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19-Sep-2017 05:41

Absolute dating entails laboratory analysis of rock samples that will take a longer time.

further, the dating results will still have to be cross-checked with mapping data.

Techniques include tree rings in timbers, radiocarbon dating of wood or bones, and trapped-charge dating methods such as thermoluminescence dating of glazed ceramics.

Coins found in excavations may have their production date written on them, or there may be written records describing the coin and when it was used, allowing the site to be associated with a particular calendar year.

The technique often cannot pinpoint the date of an archeological site better than historic records, but is highly effective for precise dates when calibrated with other dating techniques such as tree-ring dating.K–Ar dating was used to calibrate the geomagnetic polarity time scale.Thermoluminescence testing also dates items to the last time they were heated.The development of accelerator mass spectrometry (AMS) dating, which allows a date to be obtained from a very small sample, has been very useful in this regard.Other radiometric dating techniques are available for earlier periods.

The technique often cannot pinpoint the date of an archeological site better than historic records, but is highly effective for precise dates when calibrated with other dating techniques such as tree-ring dating.

K–Ar dating was used to calibrate the geomagnetic polarity time scale.

Thermoluminescence testing also dates items to the last time they were heated.

The development of accelerator mass spectrometry (AMS) dating, which allows a date to be obtained from a very small sample, has been very useful in this regard.

Other radiometric dating techniques are available for earlier periods.

The half-life of potassium-40 is 1.3 billion years, far longer than that of carbon-14, allowing much older samples to be dated.