MM883

Site: MM883

Land Unit: Ardonachie Basalt

Aust. Soil Class.: Bleach-Sodic, ?, Brown CHROMOSOL (confidence level 3)

General Land Unit Description:
The undulating rises west of Macarthur, consists mainly of Brown Chromosols. The characteristics of the Chromosols vary. Some soils may have bleached subsurface horizons or be sodic at depth and there may be a ferric horizon. Sandy Mottled Yellow Chromosols are commonly found in the western portion of the unit.

Site Description:

Geology: Quaternary basalt

Landform pattern: Gently undulating plain

Position in landscape: Open depression

Internal drainage: Moderately well drained

Soil Profile Morphology

0-25 cm

Very dark greyish brown (10YR3/2) fine sandy clay loam, pH 5. Clear transition to:

25-30 cm

Light grey (10YR7/2), sporadically bleached fine sandy clay loam. Sharp transition to:

Subsoil

B21

30-60 cm

Yellowish brown (10YR5/4) heavy clay, yellowish brown mottles, pH 6.3. Gradual transition to:

B22

60-75 cm

Light brownish grey (2.5Y6/2) medium clay, brownish yellow mottles (10YR6/8), fragments are common (200-600 mm), pH 6.8.

Key profile features:

Strongly acidic topsoil

Bleached A2 horizon

Mottled subsoil

Subsoil sodic at depth

Subsoil dispersive when worked when wet

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