MM640

Site: MM640	Land Unit: Monivae Basalt
*Aust. Soil Class.:* Ferric, Mottled-Subnatric, Brown SODOSOL (confidence level 3)

General Land Unit Description:
The level to gently undulating basalt plains between Branxholm and Glenthompson consist of an association of Vertic or Ferric Brown Chromosols and Ferric Brown Sodosols. The Chromosols typically occur on the upper slopes and crests of very slight rises that may have scattered surface boulders, and Sodosols on the lower slopes and depressions. Sodosols or Vertosols, occasionally with a sporadic bleached subsurface horizon, are usually found in open depressions or drainage lines.

Site Description:

Geology: Quaternary basalt	Landform pattern: Undulating plains
Position in landscape: Lower slope	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-30 cm	Very dark greyish brown (10YR3/2) clay loam, a few ferromanganiferous nodules, pH 6.2. Sharp transition to:
A2	30-45 cm	Pale brown (10YR6/3) silty clay loam, conspicuously bleached (10YR7/2) when dry, ferromanganiferous nodules are abundant. Sharp transition to:
	Subsoil
B21	45-60 cm	Yellowish brown (10YR5/4) medium clay, yellowish brown mottles (10YR5/8), pH 6.4. Transition to:
B22	60+ cm	Yellowish brown (10YR5/4), medium clay, yellowish brown mottles (10YR5/8), pH 6.7.

Key profile features:

Bleached A2 horizon
Ferromanganiferous nodules are abundant in A2 horizon
Mottled subsoil
Sodic subsoil

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