MM246

Site: MM246	Land Unit: Lunette
*Aust. Soil Class.:* Haplic, Hypercalcic, Red CHROMOSOL (confidence level 3)

General Land Unit Description:
Lunettes form on the eastern edge of many lakes and swamps throughout the study area. They are generally formed as low rises from wind blown material from the dry beds of the waterbodies and deposited on their leeside during drier climatic periods. Due to restrictions of scale, some lunettes have been too small to be mapped. The soil types on the lunettes are quite variable depending on the nature of the material blown from the bed of the water body. There is often a sandy topsoil over clay and calcium carbonate is often present.

Site Description:

Geology: Coarse unconsolidated	Landform pattern: Low rise
Position in landscape: Lunette crest	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-15 cm	Dark reddish brown (5YR3/4) fine sandy clay loam, weakly structured, weak consistence when dry, pH 5.6. Sharp transition to:
	Subsoil
B21	15-40 cm	Reddish brown (5YR4/4) medium clay, strong blocky structure (10-20 mm), very firm consistence when dry, pH 6.2. Clear transition to:
B22	40-60 cm	Dark red (2.5YR3/6) medium clay, strong blocky structure (10-20 mm), very firm consistence when dry, pH 7.3. Clear transition to:
B23	60-110 cm	Pale brown (10YR6/3) medium clay, with red mottles, strong blocky structure (10-20 mm), firm consistence when moist, soft carbonate nodules are common, pH 8.6. Clear transition to:
B24	110-150 cm	Light yellowish brown (2.5Y6/4) medium clay, strong blocky structure (10-20 mm), firm consistence when moist, soft carbonate nodules are common, pH 9.0. Clear transition to:
B25	150+ cm	Pale yellow (5Y7/3) medium clay, very firm consistence when moist, soft carbonate nodules are common, pH 9.0.

Key profile features:

Strong texture contrast between topsoil and subsoil
Calcium carbonate at depth
Strongly alkaline subsoil

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