Victorian Resources Online (archived)

GL76

Site: GL76	Land Unit: Annya Basalt
*Aust. Soil Class.:* Bleach-Ferric, Eutrophic, Brown CHROMOSOL (deep sandy topsoil) (confidence level 1)

General Land Unit Description:
This land unit consists of dissected gently undulating plains and undulating rises north of Mount Eckersley. The soils on the plains tend to be imperfectly drained with some low lying swamps. The rises tend to be slightly better drained, with a shallower A2 horizon, but still have the ferric horizon above the clay. This site has a deep sandy topsoil which is conspicuously bleached, indicating that the subsoil is frequently saturated.

Site Description:

Geology: Quaternary basalt	Landform pattern: Gently undulating plain
Position in landscape: Drainage depression	Internal drainage: Imperfectly drained

Soil Profile Morphology

A11	0-10 cm	Very dark greyish brown (10YR3/2) loamy sand, weak subangular blocky structure (5-10 mm), weak consistence when dry, pH 5.9. Transition to:
A12	10-25 cm	Dark brown (10YR3/3) sand, massive structure, weak consistence when dry, pH 6.1. Transition to:
A21	25-40 cm	Brown (10YR5/3) fine sand, conspicuously bleached (10YR7/1) when dry, massive structure, weak consistence when dry, few medium ferruginisous and manganiferous nodules, pH 6.2. Transition to:
A22	40-50 cm	Brown (10YR5/3) sand, conspicuously bleached (10YR7/1) when dry, massive structure, ferruginisous and manganiferous nodules are abundant, pH 5.9. Transition to:
	Subsoil
B2	50-75 cm	Yellowish brown (10YR5/4) light clay, many red, yellow and orange mottles, medium to weak subangular blocky structure (5-10 cm), very firm to strong consistence when dry, many weathered basalt fragments, pH 5.8. Transition to:[,p>]
B3	75-90 cm	Brown (10YR5/3) light clay, weak to massive structure, very firm to strong consistence when dry, abundant weathered basalt fragments, pH 6-6.5. Transition to:
C	90+ cm

Key profile features:

Strong texture contrast between topsoil and subsoil
Sodic topsoil
Bleached A2 horizon
Mottled subsoil
Many coarse fragments throughout

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