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Marong map unit Osa
Back to: A Land Capability Study of the Rural City of Marong
| Map Unit: | Ordovician sediments, crest/ridge | Map Unit Symbol: | Osa |
| % of Study Area: | 0.2 |
General Description:
The crest/ridge line of the metamorphic aureole represents only a small area of the Rural City. The soils are uniform fine sandy loams with slight Increases in clay content in the subsoil. The soils are dark grey-brown, shallow and have many angular metamorphic fragments throughout the profile and on the soil surface. Bedrock occasionally outcrops.
Site characteristics:
| Parent material age: | Ordovician | Depth seasonal watertable: | > 10 m |
| Lithology: | Sediments | Potential recharge to groundwater: | Very high |
| Landform Pattern: | Rolling hills | Flooding risk: | Nil |
| Element: | Crest | Drainage: | Rapidly drained |
| Slope common: | 0% | Depth to hardrock: | 0.36 m |
| Slope range: | 0 - 2% | ||
| Rock outcrop: | < 2% |
Present land use: Park, native forest
| Land degradation: | Water erosion | Wind erosion | Salting | Acidification | |
Sheet/rill | Gully | ||||
| Susceptibility | Moderate | Very low | Low | Low | Low |
| Incidence | Moderate | Low | Low | Low | Low |
Soil profile characteristics:
| Permeability (measured - average, range): | 4705 1761 - 5904 mm/day |
| Permeability (estimated): | - |
| Available water capacity: | 57.6 mm H2O |
| Linear shrinkage (B horizon): | 1.6% |
Soil profile description:
| A | 0-17 cm | Brownish black (10YR 2/2) fine sandy loam, weak structure, subangular blocky peds less than 2 mm, rough fabric, very weak consistence, abundant angular metamorphic cobbles and stones, pH 5.2. Gradual transition to |
| B | 17-36 cm | Greyish brown (7.5YR4/2) fine sandy loam, weak structure, subangular blocky peds 2-5 mm, rough fabric, moderately weak consistence, less than 2% organic segregations, abundant angular metamorphic cobbles and stones. pH 5.3. |
| C | 36 cm | Rock |
Soil classification:
| Factual Key (Northcote): | Uc 6.1 (major) Um5.51 (minor) |
| Australian Soil Classification: | Acidic, Mellic, Grey, Kandosol; shallow, medium loamy, very gravelly |
| Unified Soil Group: | GM |
Interpretation of soil analyses*
Horizon | pH | Gravel % | E.C. (salts) | Nutrient Status | P | K | Al | Organic Matter | Dispersibility |
| A | 5.2** | 68.9 | VL | VL | D | S | T | H | L |
| B | 5.3** | 57.1 | VL | VL | D | S | T | H | L |
Land capability assessment
Land Use | Class | Major limiting feature(s)/ landuse |
| Agriculture (CTS values) | C3T1S5 | Very high gravel/stone/boulder content,shallow depth to hardrock |
| Effluent disposal (septic tanks) | 5 | Shallow depth to hardrock, excessive permeability – risk of polluting groundwater |
| Farm dams (earthen) | 5 | Shallow depth to hardrock, very low suitability of subsoil, excessive permeability |
| Building foundations - slab | 4 | Shallow depth to hardrock |
| Building foundations - stumps/footings | 4 | Shallow depth to hardrock |
| Secondary roads | 4 | Shallow depth to hardrock |
| Urban residential | 4 | Secondary roads, building foundations |
| Rural residential | 5 | Farm dams, effluent disposal |
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A Land Capability Study of the Rural City of Marong - map unit Osa - (PDF - 38.3 KB)
