MM581

Site: MM581	Land Unit: Glenthompson Granites
*Aust. Soil Class.:* Ferric, Mottled-Subnatric, Brown SODOSOL (confidence level 3)

General Land Unit Description:
This land unit comprises a small area of Cambrian granites south of Glenthompson. The soils tend to have a strong texture contrast with a sodic subsoil. There are many ferromangaiferous nodules above the clay, which is common to many soils in the study area. The mottled subsoil and the bleached A2 horizon indicate that the soil is imperfectly drained. This feature, together with the ferric horizon, would be the major restriction for land use.

Site Description:

Geology: Cambrian granite	Landform pattern: Undulating rises
Position in landscape: Upper slope	Internal drainage: Moderately well drained

Soil Profile Morphology

A1	0-25 cm	Very dark grey (10YR3/1) loamy sand, consistence very weak, pH 5. Gradual transition to:
A2	25-60 cm	Yellowish brown (10YR5/4) sand, conspicuously bleached (10YR7/2) when dry, single grain structure, pH 5. Clear transition to:
A22	60-80 cm	Brown (10YR4/3) loamy sand, many medium ferromanganiferous nodules (2-6 mm). Sharp transition to:
A3	80-85 cm	Dark yellowish brown (10YR4/4) sandy loam, yellowish red (5YR4/6) mottles. Sharp transition to:
	Subsoil
B21	85+ cm	Yellowish brown (10YR5/6) medium clay, yellowish red (5YR4/6) mottles, weak blocky structure (20-50 mm), pH 7.

Key profile features:

Strongly acidic topsoil
Deep sandy topsoil
Bleached A2 horizon
Strong texture contrast between topsoil and subsoil
Mottled subsoil
Sodic subsoil
Many ferromanganiferous nodules in A22 horizon

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