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These artifacts of occupation can yield the magnetic declination from the last time they were fired or used.
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Archaeomagnetic dating is the study and interpretation of the signatures of the Earth's magnetic field at past times recorded in archaeological materials.
These paleomagnetic signatures are fixed when ferromagnetic materials such as magnetite cool below the Curie point, freezing the magnetic moment of the material in the direction of the local magnetic field at that time.
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The dating of archaeological materials that retain fossilized records of the Earth’s magnetic field by comparing the direction and/or strength of the material’s magnetism with known records of changes in the Earth’s magnetic field through time.