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

0-10 cm

Dark brown (10YR3/3) clay loam, hard-setting surface, pH 5.1. Clear transition to:

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

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