MM578

Site: MM578	Land Unit: Glenthompson Metasediments
*Aust. Soil Class.:* ?, Mottled-Subnatric, Brown SODOSOL (confidence level 3)

General Land Unit Description:
This land unit occurs mainly around Glenthompson, although there are scattered occurrences around Balmoral. The landscape is mainly undulating rises with some gentle colluvial slopes. The major soil type on the rises and low hills is a Chromosol, which is commonly sodic at depth (MM583). A dominant soil type on the gentle slopes tends to be a Brown Sodosol, which is represented by this site. A co-dominant soil type on the gentle slopes, which is often found in association with the Sodosols, is a Kurosol, which is often sodic at depth (MM580).

Site Description:

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

Soil Profile Morphology

A1	0-10 cm	Brown (10YR4/2) loamy sand, very weak consistence, pH 4.9. Clear transition to:
A21	10-60 cm	Light brown (10YR6/4) sand, conspicuously bleached (10YR8/2) when dry, pH 6.1. Sharp transition to:
A22	60-75 cm	Sand, many coarse quartz pebbles (6-20 mm). Sharp transition to:
	Subsoil
B21	75-90 cm	Yellowish brown (10YR5/4) sandy clay, yellowish brown mottling (10YR5/8), massive structure, pH 7.2.

Key profile features:

Strongly acidic topsoil
Deep sandy topsoil
Many coarse fragments above the clay

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