Successful archaeomagnetic dating requires appropriate earthen materials, fires sufficiently hot to create a strong and coherent alignment, recovery of a carefully aligned set of specimens from the burned archaeological feature, careful laboratory measurement of the specimens to determine a mean VGP and its error term, and interpretation of a date range from the relationship between the error ellipse and calibration curve.
[Ge]A method of determining absolute dates for certain kinds of archaeological materials, particularly in situ hearths, kilns, and furnaces, based on the principle of thermo‐remnant magnetism.
Although sample collection is not difficult, it does take practice.
Researchers should always be trained by a knowledgeable collector before attempting to take samples on their own.
When these materials are heated above about 650 °C (the Curie point) all previous alignments in the magnetic particles are destroyed, and as the material cools the particles realign themselves on the Earth's natural magnetic field.The Earth's magnetic core is generally inclined at an 11 degree angle from the Earth's axis of rotation.Therefore, the magnetic north pole is at approximately an 11 degree angle from the geographic north pole.On the earth's surface, when you hold a compass and the needle points to north, it is actually pointing to magnetic north, not geographic (true) north.The Earth's magnetic north pole can change in orientation (from north to south and south to north), and has many times over the millions of years that this planet has existed.