Much paleomagnetic data has been reported in this century suggesting that the earth's magnetic field has reversed its polarity many times in the past. Evolutionists have assumed that the time between reversals must be very long so they use reversal data as evidence that the earth is old. Often creationists are unfamiliar with the depth and variety of the paleomagnetic data and thus do not know whether the reversals were real or not. Until recently they have generally questioned the credibility of the data. Many have made the same assumption as the evolutionists, that reversals could only take place slowly. In a recent paper (Humphreys, 1986a) I have shown that this assumption is not justified, and that rapid reversals occurring during the Genesis Flood would explain the paleomagnetic data nicely. In this paper I review the evidence for reversals in order to show that it is indeed credible.