Duricrust distribution patterns can be used to debate the significance. in engineering, geomorphological and palaeoenvironmental terms. of any displayed regional components of variability. An apparently obvious source for such an exercise lies in the duta base fields devoted to duricrust types accompanying the Australia‐wide terrain tnups by Grant et al., (1984) and Chanet al., (1986) (published at scales of I:2 1/2 million and 1:5 million respectively).However, curtographic principles indicate that although there are inany attributes in common among the data base fields of these two separately conceived and generated maps (polygon sets), congruent distribution patterns for selected common attributes tire unlikelv. In this case a comparison of patterns shows that they are far from congruent. We conclude that these maps. while fulfilling their original purpose, have limited value in geomorphological debaies about the significance of duricrust distribution pattern
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