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The strengths of archaeomagnetic dating are that it dates fired clay and stone, for example hearths, kilns, ovens and furnaces, which occur frequently on archaeological sites; it dates the last use of features, providing a clear link to human activity; it is cost effective and is potentially most precise in periods where other dating methods, e.g. Archaeomagnetic dating is based on a comparison of the ancient geomagnetic field, as recorded by archaeological materials, with a dated record of changes in the Earth’s field over time in a particular geographical area, referred to as a secular variation curve.

The geomagnetic field changes both in direction (declination and inclination) and in strength (intensity) and archaeomagnetic dating can be based on either changes in direction or intensity or a combination of the two.

The vast majority of UK studies are dating by direction, as intensity dating is not commercially viable at present For archaeological material to be suitable for dating using magnetic direction it must contain sufficient magnetised particles, and an event must have caused these particles to record the Earth’s magnetic field. soils, sediments, clays, contain sufficient magnetic minerals.

There are primarily two types of archaeological events which may result in the Earth’s magnetic at a particular moment being recorded by archaeological material: heating and deposition in air or water.

Archaeomagnetism as a term is most often associated with Archaeomagnetic Dating and the use of secular variation of the Earth’s magnetic field to date archaeological burn features (e.g. However, here it is defined in its broadest sense “the use of magnetic methods of analysis on and for the understanding of archaeological materials and deposits”.

In its widest context it has also been used to refer to the magnetisation of any materials relating to archaeological times and archaeomagnetists often work on other mediums such as volcanics and lake sediments.

Dating by direction requires the exact position of the archaeological material in relation to the present geomagnetic field to be recorded, and so the material must be undisturbed and sampled in situ.

Dating by intensity does not require in situ samples but is less precise and experimentally more difficult.

These applications have different site requirements, as discussed below.The raw materials and proportions were carefully chosen to fulfil the mechanical necessities of the architectonic function: different proportions were found in plasters of floors, in the external walls, and inside the buildings; differences between earlier and later plasters were also detected.View Full-Text This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Straulino Mainou, L.; Sedov, S.; Soler Arechalde, A.If materials have been heated to a sufficiently high temperature (400°C) they may retain a thermoremament magnetisation, which reflects the Earth’s magnetic field at the time of last cooling.Suitable archaeological features would include hearths, kilns and other fired structures.




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