MM716

Site: MM716	Land Unit: Gazette Hill and Caramut Basalt
*Aust. Soil Class.:* Bleach-Ferric, ?, Brown CHROMOSOL (confidence level 3)

General Land Unit Description:
The gently undulating basalt plains and rises in the Penshurst and Caramut areas consist of Bleach-Ferric Brown Chromosols or Kurosols. Chromosols with a shallow surface horizon usually occur on the upper slopes and crests of rises which may have scattered surface boulders. Black Sodosols and Chromosols with a sporadic bleached subsurface horizon are usually found in open depressions or drainage lines.

Site Description:

Geology: Quaternary basalt	Landform pattern: Undulating plain
Position in landscape: Crest	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-10 cm	Very dark greyish brown (10YR3/2) clay loam, ferromanganiferous nodules are common, pH 4.7. Clear transition to:
A2	10-30 cm	Brown (10YR5/3), clay loam, bleached (10YR6/2) when dry ferromanganiferous nodules are abundant. Sharp transition to:
	Subsoil
B21	30-50 cm	Yellowish brown (10YR5/6) medium clay, red mottles (2.5YR4/6), pH 6.6. Gradual transition to:
B22	50-70 cm	Light olive brown (2.5Y5/4) heavy clay, yellowish brown mottles (10YR5/8), pH 6.8.

Key profile features:

Strongly acidic topsoil
Strong texture contrast between topsoil and subsoil
Ferromanganiferious nodules are abundant in A2 horizon
Subsoil dispersive when worked when wet
Mottled subsoil

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