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Since the pole has wandered over time, comparing the alignment of the iron mineral particles to the master curve of the North Pole provides a usable date for reference. Howard 1991 Direct dating of prehistoric canal sediments using archaeomagnetism.
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The discs are marked with a line which points towards the present position of the magnetic pole - which is measured with a highly accurate compass.
Then the discs and the small blocks of soil attached beneath them are carefully removed.
The weaker variations are the Earth’s magnetic map.
Within these weaker areas the local directions and intensities change gradually (secular variation).