GL17

Site: GL17	Land Unit: Dundas Redgum
*Aust. Soil Class.:* Mottled, Natric, Black KUROSOL (confidence level 1)

General Land Unit Description:
The flat surface of the Dundas Tablelands predominantly consists of Brown Chromosols and to a lesser extent Yellow Chromosols with a ferric horizon, typically occurring above the clay subsoil. The soil is commonly developed over a highly weathered mottled zone. This red and white mottling, sometimes referred to as ‘tiger mottles’, is thought to be the result of deep chemical weathering which occurred during the late Tertiary period. Red gums are the dominant vegetation found on this surface. This site occurs on a drainage depression and therefore the topsoil may be a result of more recent accumulation.

Site Description:

Geology: Cainozoic duricrust	Landform pattern: Level to gently undulating plain
Position in landscape: Lower slope / drainage depression	Internal drainage: Imperfectly drained

Soil Profile Morphology

A11	0-5 cm	Very dark brown (10YR2/2) loamy sand, weak subangular blocky structure (2-10 mm), pH 6.0; transition to:
A12	5-25 cm	Very dark grey (10YR3/2) loamy sand, massive structure, pH 6.0; diffuse transition to:
A13	25-45 cm	Very dark greyish brown (10YR3/2) sand, bleached (10YR6/1) when dry, massive structure, pH 6.0; clear transition to:
Subsoil
B21	45-80 cm	Very dark greyish brown (10YR3/2) medium heavy clay, many faint orange and yellow mottles, weak subangular blocky structure (5-15 mm), pH 5.3; abrupt transition to:
B22	80-120 cm	Reddish brown (2.5YR4/3) medium clay, many distinct yellow and orange mottles, weak subangular blocky structure (5-20 cm), few coarse fragments, pH 5.4.
BC	120-180+ cm	pH 6.4.

Key profile features:

Deep sandy topsoil
Strongly acidic subsoil
Strong texture contrast between topsoil and subsoil
Strongly sodic subsoil at depth
Bleached A2 horizon
Mottled subsoil

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