MM493

Site: MM493	Land Unit: Garvoc Maars
*Aust. Soil Class.:* Ferric, ?, Brown CHROMOSOL (confidence level 3)

General Land Unit Description:
This unit consists of undulating rises around the rim of maars in the Garvoc area. The soils of the mid and upper slopes are typically Black Chromosols. The crests are commonly acidic, black self-mulching clays (Vertosols), while the soils of the lower slopes are mainly Ferric Brown Chromosols (similar to this site) that merge with those of the surrounding plain.

Site Description:

Geology: Quaternary basalt	Landform pattern: Gently undulating plains
Position in landscape: Mid slope	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-20 cm	Very dark greyish brown (10YR3/2) clay loam, massive structure, firm consistence when dry, pH 5.5. Clear transition to:
A2	20-40 cm	Conspicuously bleached very pale brown (10YR8/2) clay loam, ferromanganiferous nodules are abundant. Sharp transition to:
	Subsoil
B21	40-60 cm	Brown (10YR5/3) heavy clay, yellowish brown mottling (10YR5/8), moderate blocky structure (5-10 mm), pH 6.4. Gradual transition to:
B22	60+ cm	Light brownish grey (2.5Y6/2) heavy clay, brownish yellow mottles (10YR6/8), coarse fragments are common(200-600 mm), ferromanganiferous nodules are common, pH 6.3.

Key profile features:

Strong texture contrast between topsoil and subsoil
Acidic topsoil
Ferromanganiferious nodules are abundant in A2 horizon
Mottled subsoil

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