Abstract
Lamellae enriched with clay have been identified in profiles of the Otama series during the course of field mapping in Southland, New Zealand. Similar soils have been reported in a variety of landscapes from other parts of the world, but explanations of their genesis differ considerably and do not fully account for the properties of the Otama series. Macro- and micromorphological analysis of this soil indicates a complex history in which the lamellae have formed by clay migration, possibly under a seasonal freeze-thaw environment, as aeolian sediment was accumulating during the last glacial. A cumulative mechanism of this kind may account for similar features in other aeolian landscapes. Limited bioturbation of lamellae occurred during the accumulation phase. Since establishment of a stable land surface during the Holocene, weathering, gleying, clay illuviation and bioturbation processes have been dominant with morphological features of present A and B horizons being superimposed on the uppermost lamellae and interlamellae.
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