31 Black and grey cracking and non-cracking clay soils and seasonally wet soils on Quaternary alluvium
| These soils are found on Quaternary alluvium predominantly within the volcanic plains, and are found mainly in low-lying areas such as swamps. These soils have either self-mulching or at least strongly pedal surfaces of fine clay aggregates which grade into coarse and fine structured strongly pedal heavy clays. The lower subsoil may be less dark or even mottled and grade into a carbonate layer. These soils have high nutrient levels including sodium (sodic). Some may be saturated for at least three months of the year due to topographic and groundwater positions, regarded as waterlogged soils. Notable characteristics include: high shrink-swell potential, strong structure, self-mulching surfaces, high organic matter content in upper soil, some mottling at depth, and high clay content throughout. They are deep to very deep (>2 m). |  |
Soil Sites
Site Code | Soil-landform unit | Component | ASC | FK | 1:100 000 mapsheet |
| Flat | Haplic, Self-mulching, Black Vertosol | Ug5.16 | T7621 - Colac | ||
CLRA35 | Flat | ?, Epipedal, Brown Vertosol | Ug5.28 | T7721 - Geelong | |
| Flat | Epihyperodic, Self-mulching, Grey Vertosol | Ug5.28 | T7621 - Colac | ||
MM75 | Flat | Mottled, Epipedal, Black Vertosol | Ug5.16 | T7621 - Colac | |
| Flat | Eutrophic, Mottled-Subnatric, Black Sodosol | Ug5.16 | T7621 - Colac | ||
MM332 | Flat | ?, Epipedal, Black Vertosol | Ug5.16 | T7521 - Corangamite | |
MM5060 | Flat | Episodic, Epipedal, Black Vertosol | Ug5.16 | T7721 - Geelong | |
| Flat | Epiacidic, Epipedal, Black Vertosol | Ug5.16 | T7521 - Corangamite |
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