(a) Polar wandering curve showing location of the magnetic pole based on paleomagnetic data from different plates. The divergence of the curves backward in time indicates different movements for the different plates. Pϵ=Precambrian, ϵ=Cambrian, O=Ordovician, S=Silurian, D=Devonian, C=Carboniferous, P=Permian, Tr=Triassic, J=Jurassic, LT, MT, UT=Lower, Middle, Upper Tertiary. (From Garland, 1979.) (b) Time variation in inclination and declination of the paramagnetic field at London, showing westward drift. (After Parasnis, 1961.)
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