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Site: IT17Land Unit: Dundas Redgum
Aust. Soil Class.: Ferric (Reticulate?), ?, Brown Chromosol (confidence level 3)

Soil pit IT17 landscape
      General Land Unit Description:
      This soil site occurs on the rises of the Tertiary duricrust. This land unit predominantly consists of Brown Chromosols with a ferric horizon, typically occurring above the clay subsoil. The soil is commonly developed over a highly weathered mottled zone. This red and white mottling, sometimes referred to as ‘tiger mottles’ is thought to be the result of deep chemical weathering which occurred during the late Tertiary period. Red gums are the dominant vegetation found on this surface.

Site Description:
Geology: Cainozoic duricrustLandform pattern: Gently undulating rises
Position in landscape: Lower slopeInternal drainage: Imperfectly drained

Soil Profile Morphology

A10-15 cmDark greyish brown (10YR4/2) sandy clay loam, weak subangular blocky structure (5-10 mm), very weak consistence when moist, pH 6. Abrupt transition to:

A215-30 cmYellowish brown (10YR5/4) light clay, weak to massive subangular blocky structure (5-10 mm), very weak consistence when moist, many ferruginous nodules (6-20 mm), pH 6. Abrupt transition to:

B2130-40 cmYellowish brown (10YR5/4) heavy clay, few faint medium orange mottles, weak subangular blocky structure (5-10 mm), very few medium ferruginous nodules (2-6 mm), pH 6.5. Clear transition to:

B2240-65+ cmYellowish brown (10YR5/6) heavy clay, many distinct medium red and pale mottles, strong subangular blocky structure (5-10 mm), consistence weak when moderately moist, pH 6.

Key profile features:

  • Many ferruginous nodules in A2 horizon
  • Mottled subsoil
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