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Longerenong Clay

Map Symbol: Lc

Geology: Tertiary (late Miocene to Pliocene) to Quaternary and late Pleistocene to Holocene.

Landform: Slopes and level areas of both flats and crests of most landscapes.

Occurrence: Longerenong clay occurs as a sub-dominant mapping unit on most major landscapes. It was not observed on the level plain, dune and swale, sand plain, valley floor or river frontage landscape units. The soil unit usually occupies relatively small isolated areas scattered throughout the landscape and often occurs in map complexes.

Representative Soil Type: The only site formally classified as Longernong clay was Site IS5.

Vegetation: Areas mapped as Longerenong clay occur within many of the provisional reconstructed vegetation units eg. the savanna woodland and grassland formations.

Generalised Soil Description:

Surface Soil

A10 - 5/35 cmBrown (10YR4/3) light clay; plastic; weak coarse granular structure; very weak consistence dry; sticky consistence wet; sharp change to:

Subsoil

B215/35 - 145 cmReddish brown (5YR4/4), with faint reddish yellow (7.5YR6/6) mottles below 30 cm; medium clay (becoming heavy clay below 65 cm); plastic; very coarse prismatic parting to weak coarse subangular blocky structure below 30 cm; strong to very strong consistence dry, sticky consistence wet; contains a slight (2-10%) amount of soft carbonate below 30 cm; gradual change to:

B22145 - 215 cmBrown (7.5YR5/5), becoming strong brown (7.5YR5/6); with pale brown (10YR6/3) mottles below 180 cm, medium clay.
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