Paleomagnetism dating

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Paleomagnetism or palaeomagnetism in the United Kingdom is the study of the record of the Earth's magnetic field in rocks, sediment, or archeological materials. Certain minerals in rocks lock-in a record of the direction and intensity of the magnetic field when they form. This record provides information on the past behavior of Earth's magnetic field and the past location of tectonic plates.

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After World War II, geologists developed the paleomagnetic dating technique to measure the movements of the magnetic north pole over geologic time.

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This record is preserved by many rocks from the time of their formation. The paleomagnetic data have played an instrumental role in deciphering the history of our planet including a decisive evidence for continental drift and global plate tectonics. The data have also been crucial for better understanding the problems of regional and local tectonics, geodynamics, and thermal history of our planet. The rifting began during an interval of reversed polarity of geomagnetic field.

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