MM243

Site: MM243	Land Unit: Nullarwarre Sedimentary
*Aust. Soil Class.:* Ferric, Mottled-Subnatric, Brown SODOSOL

General Land Unit Description:
The gently undulating plains in the Nullarwarre areas are formed on Tertiary sediments. The soil types consist of Mottled Brown Chromosols on the mounds or very slight rises with Bleached and Mottled Brown Chromosols occurring on the flats, shallow depressions or blow-outs between the mounds. The shallow saucer-shaped blowouts, which range from 20-100 m in diameter, may also contain Black or Brown, Sodosols or Chromosols.

Site Description:

Geology: Tertiary sedimentary	Landform pattern: Gently undulating plain
Position in landscape: Crest	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-10 cm	Very dark greyish brown (10YR3/2) fine sandy loam, very weak consistence when dry, pH 6. Sharp transition to:
A2	10-50 cm	Strong brown (7.5YR5/6) fine sandy loam, conspicuously bleached (7.5YR7/4) when dry, very weak consistence when dry, pH 5.9. Sharp transition to:
	Subsoil
B21	50-85 cm	Yellowish brown (10YR5/6) medium clay, yellowish red mottles (5YR4/6), strong structure, firm consistence when moist, pH 6.4. Gradual transition to:
B22	85-150 cm	Yellowish brown (10YR5/6) medium clay, red mottles (2.5YR4/6), moderate blocky structure (10-20 mm), very firm consistence when moist, ferromanganiferous nodules are common, pH 6.5. Gradual transition to:
B23	150+ cm	Yellowish brown (10YR5/6) medium clay, red mottles (2.5YR4/6), ferromanganiferous nodules are abundant, pH 6.8.

Key profile features:

Strong texture contrast between topsoil and subsoil
Bleached A2 horizon
Mottled subsoil
Sodic subsoil
Ferromanganiferous nodules abundant in the subsoil

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