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This can be carried out using an alternating magnetic field (alternating field demagnetisation) or by heating the material (thermal demagnetisation).

This calibration process also provides probability density distributions for each included structure, which allows for posterior dating and refines temporal errors considerably.The Earth's field changes in both strength (intensity) and direction over time.If the magnetism recorded within an archaeological material is compared with a record of the changes in the Earth's ancient field (geomagnetic field ), a date can be produced.The Early Medieval valley settlement of Thunau am Kamp in Lower Austria has been under archaeological excavation for 10 years.

The site was occupied during the 9th and 10th centuries AD according to potsherds, which seem to indicate two phases of activity: in the older phase ovens were placed in the corners of houses while during the younger phase they are found in the middle of the wall.Because such dating includes archaeological information it is not an independent age estimate but is a combination of all available dating methods.

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