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Definition: Archaeomagnetic dating is a method of assigning a date to a fireplace or burned earth area using the earth's magnetic field. Superheating rock or clay (hotter than firing a prehistoric ceramic) aligns the iron mineral within the material to the current magnetic north pole. 1993 A methodological approach for identifying archaeological evidence of fire resulting from human activities. Magnetism occurs whenever electrically charged particles are in motion.The Earth's molten core has electric currents flowing through it. Klein 1993 Archaeomagnetic dating on the Great Plains. Sources for the term include the references listed on the front page of the Dictionary, and the websites listed in the sidebar.Within these weaker areas the local directions and intensities change gradually (secular variation).A compass does not point to the true North Pole but to direction that is a function of the North Magnetic Pole and the local secular variation to yield a magnetic declination.
The Earth's magnetic field has two main components.
The direction and magnitude of the magnetic field of the Earth at a particular location varies with time, and can be used to constrain the age of materials.
In conjunction with techniques such as radiometric dating, the technique can be used to construct and calibrate the geomagnetic polarity time scale.
Graphite and bismuth are the strongest diamagnetic materials.
Organic compounds, such as petroleum, and heavy metals, such as gold and mercury, are strong as well.
Such materials are repelled by outside magnetic forces because of eddy currents that form in their magnetic field.