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Sandy Depression (sdp)

Geology

Pleistocene to recent sediments.

Map: Sandy Depression Map Unit
    MAP: Sandy Depression soil
Landform

Stream channel and associated terraces.


Original Vegetation

The original vegetation was a grassy open forest of red gum (Eucalyptus tereticornis). It has now largely been cleared.

Photo: Glenmaggie Lake
This photo shows the pattern of remaining vegetation.

Previous Maps and Reports

Skene and Walbran (1948) mapped much of this area as Type A.

Soils

The surface soils are greyish brown gravelly sands to sandy loams overlying a bleached (light brownish grey to light brown) sand or gravelly sand. Mottled brown, yellow and grey sandy and gravelly clays occur abruptly at about 40 cm. These are underlain by variable strata of sand, clay and gravel. The soils are generally classified as Tenosols using the Australian Soil Classification.

Chemical and Physical Analysis

One soil was analysed by Skene and Walbran (1948) and is described below.

Type A, (Skene and Walbran, 1948).
Depth
cm
Texture
pH
EC
dS/m
Cl
%
Nitrogen %
Carbon
%
Gravel
%
Coarse
sand
%
Fine
sand
%
Silt
%
Clay
%
LAT
%
0-8
S
6.0
0.07
.007
0.109
1.59
39
42
11
5
1
8-18
S
6.2
0.05
.005
4
36
44
13
5
<1
18-25
S
6.5
0.05
.006
6
36
44
12
4
2
25-38
S
6.6
0.04
.005
11
35
46
13
5
<1
38-58
GR&S
7.4
0.06
.006
33
47
28
11
14
1
58-71
SCL
7.9
0.09
.010
7
59
20
2
19
1
76-89
SC&S
8.0
0.11
.012
19
64
12
1
21
1
97-122
CSC
8.1
0.14
.015
25
65
8
3
21
2
122-137
CLS
7.9
0.13
.013
4
55
28
<1
14
<1
137-198
LC
8.3
0.29
.034
15
37
21
25
1
The following abbreviations are used to describe field texture: S - sand; LS - loamy sand; ClS - clayey sand; SL - sandy loam; L - loam; CL - clay loam; SCL - sandy clay loam; SC - sandy clay; FSCL - fine sandy clay loam; FSC - fine sandy clay; LC - light clay; MC - medium clay; HC - heavy clay; GR - gravel; ZL - silty loam; ZCL - silty clay loam; ZLC - silty light clay; ZMC - silty medium clay.

Particle size distribution data given for Skene and Walbran (1948, 1949) does not include the water content of the soil. As a result the coarse sand, fine sand, silt, clay and loss on acid treatment (LAT) may not add up to 100%.

Other symbols include: pH - analysed in water; EC - electrical conductivity; Cl - chloride; Ca - exchangeable calcium; Mg - exchangeable magnesium, K - exchangeable potassium; Na - exchangeable sodium; H - exchangeable hydrogen; ESP - exchangeable sodium percentage.

Land Use

The land uses are similar to those of the surrounding area.

Sandy Depression with Winnindoo (sdp/Wi)

This map unit is comprised of mainly sandy depression soils with less than 30% of the Winnindoo map unit. It is confined to a broad undulating depression 2 to 4 km east of Heyfield. Most of the surface soils are quite sandy to about 40 cm but some (Winnindoo) have sandy clay loam surfaces. The textures of the subsoils are all sandy clays or heavier.		Map: Sandy Depression with Winnindoo soil
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