Strong convection in the earth's core during the Deluge would rapidly reverse the magnetic field while the fossil layers were being laid down. Afterwards the field would fluctuate for several thousand years and then begin decaying steadily. This young-earth model explains the paleomagnetic and archaeomagnetic evidence better than old-earth "dynamo" theories do.
Magnetic fields, reversal, flood
Volume 1:II, Page 113-126
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Humphreys, D. Russell
"Reversals of the Earth's Magnetic Field During the Genesis Flood,"
Proceedings of the International Conference on Creationism: Vol. 1, Article 52.
Available at: https://digitalcommons.cedarville.edu/icc_proceedings/vol1/iss1/52