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Archaeomagnetic dating in the American south-west is progressing rapidly in terms of both method and application. Of particular importance has been the creation of u master curve of geomagnetic direction change ,for the region. However, confirmation, extension and refnement of this curve are always welcome contributions to the technique. So, efforts are under way to accumulate a large body of well-dated virtual geomagnetic pole positions and document these through publication so that the basis for dating samples of unknown age can be evaluated. This article adds 23 new dated pole positions to the list discussed in Eighniy (1991) and reports the results of our experiments with refining the south-west USA master curve, especially the creation of a new south-west master curve, SWCV.595.

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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.