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MM498

Site: MM498Land Unit: Glenormiston–Terang Basalt Plains
Aust. Soil Class.: Ferric, Mottled-Subnatric, Black SODOSOL (confidence level 3)

General Land Unit Description:
This land unit consists of the gently undulating basalt plains in the Glenormiston–Terang area. The dominant soils are Ferric Black Sodosols, commonly with a bleached A2 horizon and or a mottled subsoil. There are minor occurrences of Black and Brown Chromosols, commonly with a ferric horizon above the clay.

Site Description:
Geology: Quaternary basaltLandform pattern: Gently undulating plains
Position in landscape: Mid slopeInternal drainage: Imperfectly drained

Soil Profile Morphology

A10-15 cmVery dark brown (10YR2/2), clay loam, hard setting surface condition, apedal, firm consistence when dry, ferromanganiferous nodules are common, pH 5.1. Clear transition to:

A220-50 cmSporadically bleached when dry (10YR7/2), clay loam, ferromanganiferous nodules are abundant. Sharp transition to:

Subsoil
B2150-75 cmVery dark greyish brown (10YR3/2) heavy clay, dark yellowish brown mottles, strong blocky structure (20-50 mm), pH 6.6. Gradual transition to:

B2275+ cmGrey (2.5Y4/2), heavy clay, yellowish brown mottles, strong blocky structure (20-50 mm), pH 7.1.

Key profile features:

  • Strongly acidic topsoil
  • Bleached A2 horizon
  • Ferromanganiferious nodules are abundant in A2 horizon
  • Strong texture contrast between topsoil and subsoil
  • Mottled subsoil
  • Topsoil dispersive when worked when wet
  • Subsoil dispersive when worked wen wet
Soil pit MM498 graphs
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