variants: or archeomagnetism
Definition of archaeomagnetism
: the residual magnetism exhibited by archaeological remains that is used to determine their age and to help determine the former positions of the earth’s magnetic poles Archaeomagnetism (specifically, thermo-remanent magnetism) can also be used to date fired clay. Like [thermoluminescence], the principle is deceptively simple: the direction of the earth’s magnetic field has changed over time, and magnetic particles contained in clay align with the direction that prevailed at the time of their last intense heating (typically, firing in a kiln).— Kevin Greene, Interpreting the Past: Roman Pottery, 1992
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