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Soil/Landform Unit 26

Landform Unit Description

Unit 26 image a
The sharp and steep slopes of this unit lie in the east of the catchment lining the Moorabool River
      Area: 611 ha
      0.05% of CMA region

      This unit of scarp slopes is underlain by Cainozoic gravel within the dissected Western Uplands. This single scarp unit is on the southern edge of an undulating plain and rise catena formed on older (Palaeozoic) sediments (Unit 9) with a younger sedimentary (Neogene) capping in places. The soils influenced by basaltic colluvium are acidic black cracking clays (Vertosols) with some shallow brown loams (Dermosols) associated with quartzite outcropping. The clay soils are strongly structured but susceptible to sheet erosion due to slope. Depth limitations include water holding capacity as well as stoniness and aggregate stability in the case of the loams. Land use in this lower annual rainfall part of the catchment is generally extensive grazing and occasional cropping.
Unit 26 geomorphology

Unit 26 image b
Remnant vegetaton stand south of Clarendon		Unit 26 cross section
Unit 26 graph

Component
1
2
Proportion of soil-landform unit
90%
10%
CLIMATE
Rainfall (mm)

Annual: 710
Temperature (oC)
Minimum 7, Maximum 18
Precipitation less than potential evapotranspiration
October-March
GEOLOGY
Age and lithology

Neogene fluvio-marine sand, Quaternary basalt, alluvium and coastal sand dunes
Geomorphology
LANDUSE
Uncleared: Nature conservation; hardwood and softwood plantations
Cleared: Sheep and beef cattle grazing; gravel extraction; gravel and sediments
TOPOGRAPHY
Landscape

Undulating rises
Elevation range (m)
354-420
Local relief (m)
10
Drainage pattern
Dendritic
Drainage density (km/km2)
4.4
Landform
Rises
Landform element
Scarp
Outcrop
Slope and range (%)
30 (15-60)
1 (0-3)
Slope shape
Straight-concave
Straight
NATIVE VEGETATION
Structure

Open forest

Open forest
Dominant species
E. obliqua, E. viminalis, E. radiata
E. obliqua, E. viminalis, E. radiata
SOIL
Parent material

Alluvial and colluvial basalt and unconsolidated gravels, sands and clays

Quartzite
Description
(Corangamite Soil Group)
Black cracking clay soils (39)
Brown shallow loam (earth) soil (25)
Soil type sites
BD10, CLRA53, CLRA58
Surface texture
Clay
Loam
Permeability
Moderate
High
Depth (m)
1
0.1
LAND CHARACTERISTICS, POTENTIAL AND LIMITATIONS
Steep slopes combined with overland flow can cause sheet and rill erosion.
Exposure can lead to wind erosion. Soils have shallow effective rooting depth. Overland flow can cause seet and rill erosion.
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