Victorian Resources Online (archived)
MM496
| Site: MM496 | Land Unit: Mortlake Sedimentary |
| Aust. Soil Class.: Episodic, Epipedal, Black VERTOSOL (confidence level 2) | |
| General Land Unit Description: This land unit consists of Episodic Black Vertosols or Black Sodosols on near level sedimentary and alluvial plains. The largest occurrence of this unit occurs south-east of Mortlake. |
Site Description:
| Geology: Tertiary sedimentary | Landform pattern: Level to gently undulating plains |
| Position in landscape: Lower slope | Internal drainage: Imperfectly drained |
| A1 | 0-20 cm | Black (10YR2/1) medium clay, strong blocky structure (5-10 mm), pH 5.6. Clear transition to; |
| Subsoil | ||
| B21 | 20-40 cm | Black heavy clay, strong blocky structure (10-20 mm), pH 6.6. Gradual transition to: |
| B22 | 40-70 cm | Very dark grey (10YR3/1) heavy clay, strong blocky structure (10-20 mm), ferruginised nodules are common. Gradual transition to: |
| B23 | 70+ cm | Dark grey (10YR4/1) heavy clay, strong blocky structure (10-50 mm), pH 8.2. |
Key profile features:
- Strongly acidic topsoil
- Strong textural contrast between topsoil and subsoil\
- Mottled subsoil
- Topsoil dispersive when worked when wet
- Subsoil dispersive when worked when wet
