MM779

Site: MM779	Land Unit: Basalt Alluvial
*Aust. Soil Class.:* Episodic, Epipedal, Grey VERTOSOL (confidence level 2)

General Land Unit Description:
This land unit consists of the smaller swamps and depressions which occur on the basalt plains. Grey Vertosols tend to dominate the smaller swamps and depressions on the plains. Black Vertosols are commonly found in the swamps and depressions associated with the stony rise landscapes and the larger alluvial plains. Both soil types are typically sodic at depth and imperfectly drained. There are minor occurrences of Sodosols (MM667). In some areas of the basalt plain, this land unit would have been incorporated into the basalt land units.

Site Description:

Geology: Quaternary alluvial	Landform pattern: Plain
Position in landscape: Drainage depression	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-20 cm	Very dark grey (10YR3/1) medium clay, strong blocky structure (5-10 mm), pH 7.7; gradual transition to:
	Subsoil
B21	20-100+ cm	Dark grey (10YR4/1) medium clay, strong blocky structure (20-50 mm), smooth fabric, pH 8.1.

Key profile features:

clay throughout
Subsoil dispersive when worked when wet
Subsoil sodic at depth

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