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Location: Winnap

Australian Soil Classification: Ferric, Eutrophic, Red FERROSOL (confidence level 1)
General Landscape Description: Dune
Site Description: Lower slope, 6% slope
Land Unit: Nelson Dunes and Plains
Geology: Quaternary limestone

General Land Unit Description: This land unit occurs in the south western corner of the region. The land unit is generally composed of siliceous sand dunes and plains over calcareous material. The partly consolidated calcareous deposits were formed in an arcuate band (north west / south east trending) formed by the retreat of the Murray Sea. The siliceous dune and sand sheet material is generally of aeolian origin. Although there is a large area of this land unit in the south west of the study area there are also some isolated patches, mainly mixed amongst the Follet land unit that could not be mapped due to restrictions of scale.

The sand varies from orange (GL48), to red (GL39) to a paler colour, represented by this soil type. The orange and red sands are usually associated with the calcareous material, whereas the paler sands tend to have less carbonate (e.g. GL51, GL38) or the calcareous material is greater than 2 metres deep (e.g. GL50). Another soil variant occurs on the swales in between the dunes. This soil tends to have a heavier textured subsoil which may or may not have calcareous material underneath.

Soil pit GL80 auger

Soil Profile Morphology

A10-10 cmVery dark grey (10YR3/1); sandy clay loam; weak to massive structure; firm consistence, dry, pH 7.9; changes to:


B1110-25 cmDark brown (7.5YR3/3); fine sandy clay loam; massive structure; firm consistence, dry; pH 7.7; changes to:

B1225-35 cmDark brown (10YR3/4); fine sandy clay loam; massive structure; firm consistence, dry; pH 7.8; changes to:

B235-120 cmStrong brown (7.5YR4/4); light clay; moderate to strong very fine subangular blocky structure; very firm consistence, dry; pH 7.4; changes to:

B3120-160 cmStrong brown (7.5YR4/4); sandy clay; weak to massive structure; weak consistence, dry; pH 6.6.

Key profile features:

  • High in free iron

Soil pit GL80 graphs

Profile Described By: Natalie Baxter and Grant Boyle, 5th October 2000.
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