MM754

Site: MM754	Land Unit: Warrabkook Basalts
*Aust. Soil Class.:* Ferric, Mottled-Subnatric, Brown SODOSOL (confidence level 3)

General Land Unit Description:
This land unit consists of gently undulating basalt plains in the Macarthur area. In some drainage lines, the basalt has been dissected sufficiently to expose the underlying sediments. The soils on the basalt plains are commonly Brown Kurosols or Chormosols, intermixed with Sodosols, particularly on the lower slopes and drainage depressions.

Site Description:

Geology: Quaternary basalt	Landform pattern: Undulating plain
Position in landscape: Mid to lower slope	Internal drainage: Imperfectly drained

Soil Profile Morphology

A11	0-35 cm	Very dark greyish brown (10YR3/1) loamy sand, apedal structure (single grain), pH 5.0. Gradational transition to:
A12	35-70 cm	Brown (10YR4/3) sandy loam. Gradational transition to:
A2	70-90 cm	Pale brown (10YR6/3) sandy loam, conspicuously bleached (10YR7/2) when dry, ferromanganiferous nodules are abundant. Sharp transition to:
	Subsoil
B21	90+ cm	Yellowish brown (10YR5/4), heavy clay, yellowish brown mottles, pH 5.7.

Key profile features:

Acidic topsoil
Ferromanganiferious nodules are abundant in A2 horizon
Sodic subsoil
Strong texture contrast between topsoil and subsoil
Bleached A2 horizn
Mottled subsoil

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