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SW101

SW101 landscape
‘Slickensides’ – prominent shrink-swell features dominate the subsoil
    Site Code
SW101
SW101 profile
Episodic-Endocalcareous, Self-mulching, Black VERTOSOL
    Location
Lovely Banks, Bacchus Marsh-Geelong Road
    Landform
Plain
    Geology
Quaternary basalt (Lovely Banks Monocline)
    Element
plain
    Slope
0
    Aspect
East
Horizon
Depth (cm)
Description
A1
0-10
Very dark grey (5YR3/1 moist); light medium clay; self-mulching surface, rough faced peds (<10 mm); pH 6.9; clear and smooth boundary to:

B21t
10-30/40
Very dark grey (5YR3/1 moist); medium heavy clay; strongly pedal, polyhedral structure with prominent small slickensides; pH 8.5; clear and wavy boundary to:

B22ss
30/40-65/75
Dark reddish brown (5YR3/2 moist); medium clay; prismatic, polyhedral and lenticular structure, frequent large (>300 mm) slickensides; pH 9.2; wavy and abrupt to clear boundary to:

B23kss
65/75+
Dark greyish brown (2.5Y4/2 moist) or grey (2.5Y5/1); light clay; with very large slickensides (up to 1 metre) and abundant large patches of whitish soft carbonate.

Management considerations
Deep fertile soil with strongly structured surface. Shrinking and cracking constitutes a major hazard for engineering works (buildings, roads, power poles). Sodicity of the soil is high and this, coupled with the high clay content, will limit water movement through the profile.

Analytical data
Site SW101
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex acidity
FC
(-10kPa)
PWP
(-150kPa)
KS
FS
Z
C
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
%
%
%
%
%
%
A1
0-10
6.9
5.9
0.28
0.03
7.8
8.8
0.7
4.0
N/R
N/R
42.1
23.4
5.7
23.8
21
41
B21t
15-30
8.5
7.8
0.92
0.15
11.0
15.0
1.0
16
N/R
N/R
74.2
36.7
3
10.8
22.5
54.5
B22ss
40-60
9.2
8.6
1.0
0.20
8.7
14.0
1.0
17
N/R
N/R
61.4
34.3
4.6
21.8
35.5
32.5

SW101 image1
Lovely Banks monocline in the basalt plain, view eastwards (You Yangs on the left). The road running across the image is the Bacchus Marsh-Geelong road. SW101 is situated in the pipeline trench near the road crossing
SW101 image2
Trench section on the Lovely Banks Monocline slope showing shallower self mulching soil overlying highly calcareous subsoil
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