|These soils are found on Quaternary alluvium, within the volcanic plains and sedimentary terrain, mainly in low-lying areas such as swamps or terraces.|
The soils derived from the basic volcanic plains tend to be dark, mottled at depth with a fine sandy clay loam surface soil (about 20 cm depth) with no bleached subsurface horizons, over a coarse structured dark moderate to heavy clay which is mottled with depth. These subsoils are often highly alkaline and strongly sodic and may have some manganiferous gravel. The soils derived from Neogene sediments tend to have a sandier component throughout and lighter colours. Surface soils (15 cm) overlie massive bleached subsurface horizons (to 30 cm), occasionally some ferruginous gravel abruptly overlies coarse structured hard mottled (brown grey and red) light medium clay, with a high fine sand component grading into sediments at about 150 cm. These soils may even be sodic near the surface, making them very hardsetting and the subsoils are strongly dispersive.
Notable characteristics include: a degree of sodicity, abrupt texture contrast, hardsetting nature and position in landscape (terrace, older alluvial plains or low-lying swamps). Some may be regarded as waterlogged soils.
1:100 000 mapsheet
|Flat||Eutrohpic, Mottled-Hypernaric, Brown Sodosol||Dy3043||T7821 - Sorrento|
|Flat||Melanic, Mottled-Subnatric, Brown Sodosol||Dy3.42||T7821 - Sorrento|
|Simple slope||Melanic, Mottled-Mesonatric, Black Sodosol||Dd2.42||T7621 - Colac|
|Lower slope||Eutrophic, Mottled-Subnatric, Black Sodosol||Dd2.32||T7621 - Colac|
|Simple slope||Magnesic, Mottled_Mesonatric, Brown Sodosol||Dy3.42||T7622 - Ballarat|
|Flat||Ferric, Mottled-Hypernatic, Brown Sodosol||Dy3.43||T7521 - Corangamite|
|Flat||Melacic, Subnatric, Black Sodosol||Dd1.31||T7521 - Corangamite|
|Lower slope||Eutrophic, Mottled-Subnatric, Brown Sodosol||Dy3.41||T7721 - Geelong|
|Flat||Vertic (& Calcic), Mesonatric, Black Sodosol||Dd2.43||T7621 - Colac|
|Flat||Vertic (& Calcic), Mottled-Mesonatric, Black Sodosol||Dd2.23||T7621 - Colac|
|Flat||Vertic (& Calcic), Mottled-Hypernatric, Black Sodosol||Dd2.13||T7721 - Geelong|