MM633

Site: MM633	Land Unit: Karabeal Basalt
*Aust. Soil Class.:* Ferric, Mottled-Subnatric, Brown SODOSOL (confidence level 3)

General Land Unit Description:
This land unit consists mainly of gently undulating basalt plains with some subtle rises to the north-east of Hamilton. The dominant soil types are Brown Sodosols, commonly with a ferric horizon in association with Bleached-Ferric Chromosols. There may be a few surface stones, particularly on the low rises and patches of gilgai microrelief.

Site Description:

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

Soil Profile Morphology

A1	0-10 cm	Dark brown (10YR3/3) clay loam, hard-setting surface, pH 5.1. Clear transition to:
A2	10-25 cm	Sporadically bleached (10YR7/2) when dry, ferromanganiferous nodules are abundant. Sharp transition to:
	Subsoil
B21	25-45 cm	Dark yellowish brown (10YR4/4) medium clay, red mottles, pH 6.1. Gradual transition to:
B22	45+ cm	Yellowish brown (10YR5/6) medium clay, red mottles, pH 7.0.

Key profile features:

Strongly acidic topsoil
Ferromanganiferious are abundant in A2 horizon
Strong texture contrast between topsoil and subsoil
Sodic subsoil
Subsoil dispersive when dry

Page top