Abstract

"Finger-print" patterns discussed by Tanner (1958) appear to be similar to Australian "gilgai" soils which have two types of surface soil showing appreciable surface microrelief. This relief takes the form of sub-parallel ridges and valleys, or random mounds and depressions, or a network arrangement of ridges with enclosed depressions. The puff, or ridge, soil is calcareous; the shelf, or valley, soil is not calcareous on the surface, but its subsoil is similar to that found at the surface of the puffs. Genesis of "gilgai" soils is not well understood. Over much of the area in Australia where these soils occur, an origin by frost action is unlikely. Alternate drying and wetting may cause the observed features.

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