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Yarragon (Yg)

Geology

Recent alluvium and colluvium derived from Strzelecki hills.

Landform

Sheet flood fan, alluvial fan, alluvial plain.

Map: Yarragon Unit
Photo: Soil Site GP19 Landscape
Yarragon mapping unit landscape in foreground with Strzelecki hills in background.

Land Use


The original vegetation was probably swamp gum, swamp paperbark, blackwood and black wattle. This vegetation is now largely cleared and sown to improved pasture grazed by dairy and beef cattle.

Soils

The surface soils are typically greyish brown to very dark greyish brown clay loams and silty clay loams to light clays to about 20 cm. Below this, colours show considerable variation ranging from dark greyish brown to pale brown with soil textures ranging from silty clay loams to silty clays. Pale brown mottled with yellowish brown or reddish brown silty clays to medium clays generally occur from about 80 cm. Soil Pit Site GP19 is an example of a Dermosolic Hydrosol near Darnum.

The example sites below are soil auger descriptions.

SITE WAR 5Dermosolic, Redoxic Hydrosol - located on a plain near Darnum South.

Surface Soil:
A10-20 cmBrown (10YR5/3) light clay; pH 5.7; clear change to:
Subsoil:
B2120-80 cmLight brownish grey (10YR6/2) medium clay; pH 6.2; gradual change:
B2280-120 cmLight grey (10YR7/1) with brownish yellow (10YR6/6) mottles; medium clay; pH 5.5.


SITE WAR 8Dermosolic Hydrosol - located on a plain near Gainsborough.

Surface Soil:
A10-30 cmBrown (10YR5/3) silty light clay; pH 5.4; clear change to:
Subsoil:
B230-100 cmLight brownish grey (10YR6/2) medium clay; pH 6.1.



SITE WAR 9Dermosolic Hydrosol - located on a pediment near Gainsborough.

Surface Soil:
A10-30 cmBrown (10YR5/3) silty clay loam; pH 5.3; gradual change to:
Subsoil:
B2130-80 cmPale brown (10YR6/3) silty light clay; pH 5.6:
B2280-100 cmPale brown (10YR6/3) light medium clay; pH 6.3.


SITE WAR 10Acidic, Dermosolic Hydrosol using the Australian Soil Classification - located on a broad drainage depression at Ellinbank.
Surface Soil:
A10-20 cmGreyish brown (10YR5/2) light clay; pH 5.0; clear change to:
Subsoil:
B2120-60 cmLight grey (10YR7/2) with yellowish brown (10YR5/8) mottles; medium clay; pH 5.1:
B2260-100 cmLight grey (10YR7/2) with yellowish brown (10YR5/8) mottles; medium clay; pH 5.4.
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