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Direct Dating of Prehistoric Canal Sediments Using Archaeomagnetism

The problems with dating prehistoric canals are renowned, due to the fact they seldom contain material appropriate for traditional dating methods. However, the application of archaeomagnetic techniques may offer a method of dating canals in those regions where master curves of polar wandering already exist. Detrital remanent magnetism in Hohokam canal sediments seems to produce accurate dates with ranges of ca. 200 years, twice the resolution of previous canal-dating attempts. However, at least some of the sediments seem to record inclinations that are less accurate than the declinations. In these cases, the declination values for the sediments can be compared to master declinations curves as a method of dating the sediments.