Horsham Clay
Map Symbol: Hc
Australian Soil Classification: Various Self-mulching and Epipedal, Grey VERTOSOLS.
Northcote Factual Key: Codes include Ug 5.24 and Ug 5.28.
Great Soil Group: grey clays.
Geology: Late Tertiary to Quaternary, Shepparton Formation.
Landform: Level areas situated in plains.
Occurrence: Horsham clay occurs as a co-dominant mapping unit with Murtoa clay on the Black Box flats landscape unit near Murtoa and on the flood plain landscape unit east of Horsham. Where it is associated with Murtoa clay, the Horsham clay unit occupies a slightly more elevated topographic position. It occurs as sub-dominant on the prior stream flood plain, lake and lunette, high plains, gently undulating plains and dune and swale landscape units.
Representative Soil Type: Site IS17 is an example of a Horsham clay.
Vegetation: A savanna woodland formation characterised by a Grey Box (E. microcarpa) association, may have been dominant on areas of Horsham Clay.
Generalised Soil Description:
Surface Soil
| A1 | 0 - 10/30 cm | Dark grey (10YR4/1) light or medium clay; plastic; self-mulching surface condition; weak or moderate, fine or medium subangular blocky structure; very weak or strong consistence dry, slightly sticky consistence wet; contains a trace (< 2%) amount of hard or soft carbonate; sharp change to: |
| Subsoil | ||
| B21 | 10/30 - 55/85 cm | Dark grey (10YR4/1) [occasionally greyish brown (2.5YR5/2)] medium or heavy clay; plastic; moderate or strong, coarse or very coarse prismatic structure breaking down into coarse subangular aggregates; strong consistence dry, slightly or moderately sticky consistence wet; contains a trace (< 2%) amount of hard carbonate; sharp or gradual change to: |
| B22 | 55/85 - 85/140 cm | Dark grey (10YR4/1) or grey (5YR5/1) medium or heavy clay; plastic; contains large slickensides breaking down into medium blocky structure; strong or very strong consistence dry, moderately sticky consistence wet; contains a slight (2-10%) amount of hard carbonate; gradual change to: |
| B3 | 85/140 - 115/196 cm | Pale olive (5YR6/3), light grey (2.5YR7/2) or greyish brown (10YR5/2) medium or heavy clay; plastic; contains large slickensides breaking down into weak medium blocky structure; strong consistence dry, sticky consistence wet; contains a slight (2-10%) amount of hard carbonate. |
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