37 Brown, black and grey non-sodic and sodic texture contrast soils on Quaternary basic volcanics
| These soils occur extensively on basic volcanic deposits including ash deposits and moister areas (compared with the strongly sodic soils) and can be moderately acidic to alkaline. These soils have dark organic fine sandy loam to very fine sandy clay loam surface soils (5–15 cm, up to 30 cm) overlying a bleached often very ferruginous (>40%) clay loam subsurface horizon (to 25–50 cm), abruptly overlying a brown medium structured medium clay which may be mottled (orange, yellow, red) and/or sodic with depth. The lower subsoil may well be neutral or alkaline. Variants with sodic upper subsoils (SFS5) may not have an A2 horizon; the generally shallower topsoil (20 cm) will abruptly overly the subsoil, which is another example of the puff component of gilgai microrelief. Notable characteristics include: texture contrast, structure differences between horizons, presence of bleached A2 (or occasional absence), acidic upper soil, and alkaline/sodic lower subsoil, often with shrink-swell properties (and associated spatial variations). |  |
Soil Sites
Site Code | Soil-landform unit | Component | ASC | FK | 1:100 000 mapsheet |
CLRA51 | Lower slope | Vertic, Magnesic, Black Chromosol | Dd3.13 | T7621 - Colac | |
COF03a | - | Eutrophic, Subnatric, Brown Sodosol | Dy2.23 | T7722 - Bacchus Marsh | |
COF03b | - | Vertic, Subnatric, Grey Sodosol | Dy3.22 | T7722 - Bacchus Marsh | |
COF03c | - | Vertic, Subnatric, Brown Sodosol | Dy3.22 | T7722 - Bacchus Marsh | |
| Crest | Eutrophic, Mottled-Subnatric, Black Sodosol | Dd2.33 | T7621 - Colac | ||
| Crest | Vertic (& Calcic), Subnatric, Black Sodosol | Dd2.33 | T7622 - Ballarat | ||
| Mid slope | Bleached-Ferric, Eutrophic, Black Chromosol | Dd4.32 | T7521 - Corangamite | ||
| Upper slope | Mottled-Sodic, Mesotrophic, Brown Chromosol | Db2.31 | T7521 - Corangamite | ||
| Flat | Haplic, Calcic, Black Chromosol | Dd1.13 | T7521 - Corangamite | ||
| Flat | Bleached-Ferric, Eutrophic, Brown Chromosol | Db2.41 | T7521 - Corangamite | ||
| Flat | Melanic, Mottled-Subnatric, Black Sodosol | Dd2.12 | T7521 - Corangamite | ||
| Crest | Melanic, Mottled-Subnatric, Brown Sodosol | Dy3.32 | T7721 - Geelong | ||
| Crest | Mottled, Eutrophic, Black Chromosol | Dd1.32 | T7722 - Bacchus Marsh | ||
| Mid slope | Vertic (& Sodic), Eutrophic, Brown Chromosol | Dy3.13 | T7522 - Skipton | ||
| Mid slope | Fertic, Eutrophic, Brown Chromosol | Db1.22 | T7521 - Corangamite | ||
| Lower slope | Bleached-Vertic, (& Ferric), Eutrophic, Grey Chromosol | Dy3.42 | T7521 - Corangamite | ||
SW29 | Flat | Bleached-Sodic, Eutrophic, Brown Chromosol | Db2.42 | T7521 - Corangamite | |
SW34 | Mid slope | Bleached-Vertic, Mesotrophic, Brown Chromosol | Dy3.41 | T7521 - Corangamite | |
- | Lower slope | Bleached-Vertic (& Ferric), Eutrophic, Brown Chromosol | Db2.41 | T7421 - Mortlake | |
SW85 | Flat | Vertic (& Calcic), Subnatric, Grey Sodosol | Dy3.43 | T7621 - Colac | |
SW104 | Upper slope | Vertic (& Hypercalcic), Subnatric, Black Sodosol | Dd1.13 | T7721 - Geelong |
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