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27 Brown, red and black sodic and non-sodic texture contrast soils on Palaeogene sediments

These texture contrast soils are found on Palaeogene sediments around the foothills of the Otway Range. An organic fine sandy loam (about 15 cm) clearly overlies a bleached massive sandy loam subsurface horizon often to a depth of 50 cm, abruptly overlying a coarse to medium strongly structured brown mottled (red and yellow) medium to heavy clay, which grades at about 100 cm into a sandy clay and/or cemented sandstone or calcareous deposits.

Notable characteristics include: variable depth of bleached subsurface horizon, abrupt texture contrast between surface soils and mottled subsoil, deep weathered profiles (sometimes vertic with depth), acidic profiles bordering on strongly acidic, some profiles are acidic but alkaline (calcareous) at depth depending on lithology and climate. The sodic soils are subnatric, other soils may be sodic in the deep subsoil only.
CLRA Soil Unit 27

Soil Sites

Site Code
Soil-landform unit
1:100 000 mapsheet
CrestMesotrophic, Mottled-Subnatric, Brown SodosolDy3.41T7621 - Colac
CrestEutrophic, Mottled-Subnatric, Brown SodosolDb2.42T7621 - Colac
Upper slopeVertic, Calcic, Black ChromosolGn3.43T7721 - Geelong
Upper slopeCalcic, Mesonatric, Red SodosolDr2.13T7721 - Geelong
Mid slopeCalcic, Mesonatric, Brown SodosolDy3.12T7721 - Geelong
Upper slopeBleached-Mottled, Mesotrophic, Brown SodosolDb2.31T7621 - Colac
Upper slopeVertic, Mottled-Subnatric, Brown SodosolDy3.41T7621 - Colac
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