MM686

Site: MM686	Land Unit: Grampians Alluvial
*Aust. Soil Class.:* Calcic, Mesonatric, Grey SODOSOL (confidence level 3)

General Land Unit Description:
This land unit consists of the alluvial plains around the Grampians. The soils are commonly poorly drained Grey Sodosols in association with Podosols. Some areas experience months of inundation. These soils are commonly Hydrosols. The vegetation is mainly thick scrubby tea tree on the wetter soils.

Site Description:

Geology: Quaternary alluvial	Landform pattern: Plain
Position in landscape: Flat	Internal drainage: Poorly drained

Soil Profile Morphology

A1	0-30 cm	Very dark greyish brown (10YR3/2) loamy sand, pH 4.8. Clear transition to:
A2	30-40 cm	Pale brown (10YR6/3) loamy sand, conspicuously bleached (10YR7/2) when dry. Sharp transition to:
	Subsoil
B21	40-60 cm	Very dark grey (10YR4/1) heavy clay, strong blocky structure (20-50 mm), pH 7.9. Clear transition to:
B22	60+ cm	Light brownish grey (2.5Y6/2) heavy clay, with yellowish brown mottles, carbonate nodules are common, pH 8.9.

Key profile features:

Sandy topsoil
Bleached A2 horizon
Strong textural contrast between topsoil and subsoil
Calcium carbonate at depth
Sodic subsoil
Subsoil dispersive when dry

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