Astrochronology is the dating of
sedimentary units by calibration with
astronomically tuned timescales, such as
Milankovic cycles,
or even
sunspot cycles. When used in concert with
radiometric dating
Radiometric dating, radioactive dating or radioisotope dating is a technique which is used to Chronological dating, date materials such as Rock (geology), rocks or carbon, in which trace radioactive impurity, impurities were selectively incorporat ...
, it allows the resolution of timescales to a high degree of accuracy. If
orbital precession cycles are identified, the dating error can be as low as 21,000 years.
References
Geochronological dating methods
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