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Astrochronology is the dating of sedimentary units by calibration with astronomically tuned timescales, such as Milankovic cycles,[1][2] or even sunspot cycles. When used in concert with radiometric dating, 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.


  1. ^ W. Krijgsman; A. R. Fortuinb; F. J. Hilgen; F. J. Sierrod (2001). "Astrochronology for the Messinian Sorbas basin (SE Spain) and orbital (precessional) forcing for evaporite cyclicity". Sedimentary Geology. 140 (1–2): 43–60. Bibcode:2001SedG..140...43K. doi:10.1016/S0037-0738(00)00171-8. hdl:1874/1632.
  2. ^ Meyers, S.R. (2008). "Resolving Milankovitchian controversies: The Triassic Latemar Limestone and the Eocene Green River Formation". Geology. 36 (4): 319–322. Bibcode:2008Geo....36..319M. doi:10.1130/G24423A.1. S2CID 49582867.