GL26
| Site: GL26 | Land Unit: Follet Dunes and Plains |
| Aust. Soil Class.: Hypercalcic, Subnatric, Grey SODOSOL (confidence level 1) | |
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General Land Unit Description: The majority of this land unit falls south of the Kanawinka fault. This land unit comprises areas with deep sand deposits. The residual landscape is thought to be influenced by the retreat of the Murray Sea which left stranded beach ridges oriented south west–north east. These were subsequently covered by superficial sand sheets in later depositional phases, which formed the landscape seen today. The major landforms in this land unit are dunes and swales. Podosols and Kurosols or Chromosols are the major soil types found on the dunes and rises. Podosols are soils with a ‘coffee rock’ layer (refer to photograph). The Kurosols or Chromosols tend to have a deep sandy topsoil over the clay. The common soil types on the swales are black cracking clay (Vertosols) or Grey Sodosols. Some Ferric Kurosols or Chromosols can also occur on the swales or lower slopes of the dunes. |
Site Description:
| Slope: 2% | Geology: Quaternary aeolian |
| Landform pattern: Plain | Position in landscape: Swale |
| Internal drainage: Poorly drained |  |
| A11 | 0-15 cm | Loamy sand |
| A12 | 15-35 cm | Dark grey (10YR4/1) loamy sand, apedal structure, pH 6.8; transition to: |
| A31 | 35-55 cm | Black (10YR2/1) clay sand, massive structure, pH 7.4; transition to: |
| A33 | 55-90 cm | Dark greyish brown (10YR4/2) loamy sand, massive structure, very few fine soft calcareous segregations, pH 8.1; transition to: |
| Subsoil | ||
| B21 | 90-120 cm | Grey (10YR5/1) sandy clay, many faint yellow mottles, massive to weak structure, medium soft calcareous segregations and nodules are common, pH 8.8; transition to: |
| B22 | 120-190 cm | Dark grey (10YR4/1) sandy clay, massive to weak structure, many medium soft calcareous segregations and nodules, pH 9.0; transition to: |
| C | 190-220+ cm | Massive structure. |
Key profile features:
- Strong texture contrast between topsoil and subsoil
- Sandy topsoil
- Calcareous nodules throughout
- Strongly alkaline subsoil
- Sodic surface horizon
- Sodic subsoil
- Mottled subsoil
- Deeper topsoil dispersive when worked when wet
- Subsoil dispersive when worked when wet
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