Paleomagnetic dating or archaeomagnetism
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Blackett provided a major impetus to paleomagnetism by inventing a sensitive astatic magnetometer in His intent was to test his theory that the geomagnetic field was related to the Earth's rotation, a theory that he ultimately rejected; but the astatic magnetometer became the basic tool of paleomagnetism and led to a revival of the theory of continental drift.Alfred Wegener first proposed in that continents had once been joined together and had since moved apart. Irving  constructed apparent polar wander paths for Europe and North America.LTD results also showed that some of the boulders decrease their remanence after multiple LTD, suggesting that very little MD magnetite was present.Therefore, the discrepancies in the ages may be the result of changes in grain size or domain configurations.
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If the clay has remained undisturbed since it was fired, it will indicate the position of the pole when it was made.
Then in Morley, Vine and Matthews showed that marine magnetic anomalies provided evidence for seafloor spreading.
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