Looking orth over swamps, lunettes and plains of this unit
1.26% of CMA region
This unit consists of gently undulating plains, swamps and associated minor lunettes that occur between Cressy and Colac. Located within the volcanic Western Plains, the relief of this unit is subdued having a masked affect upon agricultural performance and land versatility. This unit has a number of components, some (such as the low rises and undulating plain) are erosional landforms while others (such as the swamps, flats and lunettes) are depositional. The unit is adjacent to lakes and basaltic (stony) rises and forms a north-south corridor between Cressy and Lake Colac. Remnant vegetation of this unit is Plains Grassy Woodland. The soils are black strongly sodic texture contrast soils on the plains (coarse structure, hardsetting) with black and red cracking self-mulching soils on the lunettes, and black and grey cracking soils in the swamps. Land use is generally grazing, with the capability of the unit varying with component composition. The shallower soils on rock and strongly structured soils on the lunettes provide more use throughout the year than the wetter flats.
Soils are prone to pugging by cattle when saturated
Dairy farming and feed lots of Friesian heifers on the
plains and swamps
Proportion of soil-landform unit
Minimum 8, Maximum 19
|Precipitation less than potential evapotranspiration|
Age and lithology
Uncleared: Nature conservation; water supply; active and passive recreation
Cleared: Cropping; beef cattle and sheep grazing; dairy; regional development
Gently undulating plains with swamps, lakes and lunettes
|Elevation range (m)|
|Local relief (m)|
|Drainage density (km/km2)|
Low rises and hillocks
Plains with minor drainage depressions
Swamps and broad depressions
Crests and upper slopes
Mid and lower slopes
|Slope and range (%)|
Ecological Vegetation Class
Plains Grassy Woodland (1%)
In situ basalt
In situ basalt
In situ basalt and associated colluvium
Alluvial clay, silt and sand
(Corangamite Soil Group)
Alkaline black and grey self-mulching clays (9)
Alkaline mottled black texture contrast soils, some not mottled (35)
Alkaline grey cracking clays (31)
|`Soil type sites|
Fine sandy clay loam
Moderate to high
|LAND CHARACTERISTICS, POTENTIAL AND LIMITATIONS|
Friable soils, some expansive clays. Gradational or uniform texture change with depth. Moderate to high permeability, moderately rapid site drainage. Moderate to high nutreient capacity.
Friable but expansive clays and other friable soils. Uniform or gradational texture change with depth. Moderate permeability, moderately rapid site drainage.
Friable but expansive clays, calcareous and often sodic at depth. high nutrient capacity.
Texture contrast, possible waterlogging and compaction.
High seasonal watertable leads to soil compaction. High organic matter content, high clay content and expansive clays.