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Precision

It is difficult to make generalisations about the precision that can be expected from an archaeomagnetic date as the Earth's magnetic field changes at varying rates through time. In periods where the change in direction was rapid, it may be possible to produce a more precise age range, but in the periods where the changes are slower a larger age range may be produced. A related issue is that during the last few millennia the Earth's magnetic poles appear at times to have reoccupied the same position on more than one occasion (for instance during the first centuries BC and AD). This can cause ambiguity as more than one date range is then possible and independent evidence is require to determine which is correct.

The precision available for archaeomagnetic dates calibrated with the RenCurve (Lanos 2004; Zananiri et al. 2007) calibration curves have been summarised in the 'Secular varition and calibration curve' section.