IT17

Site: IT17	Land Unit: Dundas Redgum
*Aust. Soil Class.:* Ferric (Reticulate?), ?, Brown Chromosol (confidence level 3)

General Land Unit Description:

This soil site occurs on the rises of the Tertiary duricrust. This land unit predominantly consists of Brown 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.

Site Description:

Geology: Cainozoic duricrust	Landform pattern: Gently undulating rises
Position in landscape: Lower slope	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-15 cm	Dark greyish brown (10YR4/2) sandy clay loam, weak subangular blocky structure (5-10 mm), very weak consistence when moist, pH 6. Abrupt transition to:
	Buckshot
A2	15-30 cm	Yellowish brown (10YR5/4) light clay, weak to massive subangular blocky structure (5-10 mm), very weak consistence when moist, many ferruginous nodules (6-20 mm), pH 6. Abrupt transition to:
	Subsoil
B21	30-40 cm	Yellowish brown (10YR5/4) heavy clay, few faint medium orange mottles, weak subangular blocky structure (5-10 mm), very few medium ferruginous nodules (2-6 mm), pH 6.5. Clear transition to:
B22	40-65+ cm	Yellowish brown (10YR5/6) heavy clay, many distinct medium red and pale mottles, strong subangular blocky structure (5-10 mm), consistence weak when moderately moist, pH 6.

Key profile features:

Many ferruginous nodules in A2 horizon
Mottled subsoil

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