GL70

Site: GL70	Land Unit: Marl
*Aust. Soil Class.:* Vertic, Eutrophic, Brown CHROMOSOL (confidence level 1)

General Land Unit Description:
This land unit is a complex consisting of mainly gently undulating to level plains with numerous small depressions. In the more undulating portion of the unit, the very slight rises with broad level crests have soils consisting of Dermosols (GL98) or Chromosols (GL70). The soils are variable, some soils have soft carbonate nodules at depth, some soils have ferruginous nodules and some soils exhibit vertic (cracking) characteristics. There are also minor occurrences of sand hills and dunes consisting of deep, uniform sands (Podosols). The numerous small depressions are commonly alkaline grey or black cracking clays (Vertosols). A minor soil type in some depressions are acidic black cracking clays (Vertosols) and some shallow soils. The soils in the western portion of the land unit tend to have poorer internal drainage compared to those in the eastern zone. The major restriction for land use is the poor internal drainage and the variable soils within a short distance. This soil type is a minor soil type on the plains of this land unit.

Site Description:

Geology: Tertiary marl	Landform pattern: Gently undulating to level plains
Position in landscape: Broad crest	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-10 cm	Very dark brown (10YR2/2) loam, weak subangular blocky structure (5-10 mm), pH 6.3. Clear transition to:
	Subsoil
B21	10-30 cm	Yellowish brown (10YR5/4) light medium clay, many prominent weathered sedimentary red and grey mottles, moderate subangular blocky structure (5-10 mm), small to medium angular sedimentary fragments are common (2-20 mm), pH 6.9. Transition to:
B22	30-55 cm	Yellowish brown (10YR5/6) light clay, many prominent red and grey mottles, weak subangular blocky structure (10-20 mm), pH 6.7. Transition to:
B23	55-100 cm	Greyish brown (2.5Y5/2) light clay, many prominent red and grey mottles, weak structure, pH 6.2. Transition to:
B24	100-150 cm	Greyish brown (2.5YR5/2) light clay, many prominent red and yellow mottles, small to medium angular sedimentary fragments are abundant (2-20 mm), pH 6.2. Transition to:
B3	150-200+ cm	Greyish brown (2.5Y5/2), light clay, many prominent yellow mottles, pH 6.5.

Key profile features:

Sodic subsoil at depth
Deeper subsoil dispersive when dry
Mottled subsoil
Many coarse fragments throughout

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