Type D

Type D is a minor soil type distinguished by a shallow surface horizon (less than 23 cm thick) which rests abruptly on yellow friable clay. A bleached subsurface (A2) horizon is absent.

Typical Profile

Surface
A	0-15 cm	Greyish brown to dark grey-brown (10YR4/3, 5/3, 5/4) loam; sometimes with a trace of buckshot; sharply separated from:
Subsoil
B1	15-52 cm	Yellow-brown to yellow (10YR to 2.5Y6/4-7/8) diffusely mottled friable clay, with olive and brownish red subordinate colours, usually somewhat brighter in the lower part of the horizon; an occasional piece of buckshot; grading into:
B2	52-82 cm	Yellow-brown and grey mottled friable clay; at depths varying from 67 to 90 cm; usually sharply separated from:
B3	82-120 cm	Grey, yellow-grey and brown, mottled clay; intractable and dense; scattered black inclusions; slight calcium carbonate irregularly present.

Variations

Where the soil type occurs on the higher parts of the plain, its surface horizon is usually greyish brown or even dull brown in color. In lower situations within Unit 2, grey-brown to brownish grey colors, sometimes with fine rusty root channel mottling are more common.

Occurrence

The type is found on both the higher parts of the plains as a component of Unit 1, and over lower-lying parts in areas of Unit 2. In only one instance was Type D found over an area large enough to map separately. It appears to occur in locally better drained situations. In the areas of Unit 2, these are the puff components of the gilgai micro-relief and the sides of the broad, shallow drainage ways.

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