This map shows the locations of the main soil types in the North Island. Most noticeably, Granular and Oxidic soils are limited to the warmer Northland and South Auckland regions, and Allophanic and Pumice soils derived from volcanic ash are concentrated in the central part of the island.
Te whakamahi i tēnei tūemi
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Source: Les Molloy, Soils in the New Zealand landscape: the living mantle. 2nd ed. Lincoln: New Zealand Society of Soil Science, 1998, p. 230