GL164

Site: GL164	Land Unit: Dundas Sedimentary
*Aust. Soil Class.:* Mottled, Petroferric, Brown CHROMOSOL (confidence level 1)

General Land Unit Description:
This site is situated on the flat surface of the Dundas Tablelands. Red gums are the dominant vegetation found on this surface. The dominant soil type is a Brown Chromosol, commonly with a ferric horizon which, in some cases, may be cemented (petroferric). The soil is developed over a highly weathered mottled zone. This mottled zone sometimes referred to as ‘tiger mottling’ is thought to be the result of fluctuating watertables which occurred mainly in the Tertiary period.

Site Description:

Slope: 0-1%	Geology: Tertiary marine sandstone
Landform pattern: Level plain	Position in landscape: Flat
Internal drainage: Moderately well drained

Soil Profile Morphology

A1	0-25 cm	Very dark grey (7.5YR3/1) sandy loam, weak blocky structure (10-50 mm), weak consistence when dry, very few medium angular ferruginised nodules (6-20 mm), pH 6.5. Clear and wavy transition to:
A2	25-40 cm	Dark yellowish brown (10YR4/4) fine sandy clay loam, weak to massive blocky structure (10-50 mm), firm consistence when moist, many medium to coarse ferruginous and manganiferous nodules, pH4.7. Clear and wavy transition to:
	Subsoil
B2	40-60 cm	Dark yellowish brown (10YR4/6) light medium clay, sandy, weak blocky structure (5-10 mm), firm consistence when moist, many coarse ferruginous and manganiferous nodules, pH 5.5. Clear but wavy transition to:
BC	60-85 cm	Mainly buckshot, ferruginous and manganiferous nodules are abundant, moderately cemented discontinuous, ferricrete pan. Abrupt but wavy transition to:
C	85-150 cm

Key profile features:

Strongly acidic topsoil (A2)
Acidic subsoil
Ferruginous pan

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