MM292

Site: MM292	Land Unit: Bookar Basalts
*Aust. Soil Class.:* Mottled-Subnatric, ?, Black SODOSOL (confidence level 3)

General Land Unit Description:
The gently undulating to level basalt plains to the north-west of Camperdown consist mainly of Black Sodosols, although there are minor occurrences of Brown Sodosols and Chromosols. Areas of gilgai microrelief may occur and a few scattered surface stones occur on some slopes.

Site Description:

Geology: Quaternary basalt	Landform pattern: Gently undulating to level plain
Position in landscape: Lower slope	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-25 cm	Very dark greyish brown (10YR3/2) clay loam, firm surface condition, strong structure (10-20 mm), weak consistence when dry, pH 5.6. Clear transition to:
A2	25-40 cm	Sporadically bleached when dry (10YR7/2) clay loam. Sharp transition to:
	Subsoil
B21	40-60 cm	Very dark grey (10YR3/1) heavy clay, dark yellowish brown mottles, strong blocky structure (20-50 mm), pH 6.7. Gradual transition to:
B22	60+ cm	Dark greyish brown (10YR4/2) heavy clay, dark yellowish brown mottles, strong blocky structure (20-50 mm), pH 7.6.

Key profile features:

Strong texture contrast between topsoil and subsoil
Bleached A2 horizon
Mottled subsoil
Subsoil dispersive when dry

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