Alluvial sediments deposited in the Pleistocene period. Following the notation of Vandenberg and O’Shea (1981), these sediments are called Qp4 (refer to Diagrammatic Representations). These deposits often contain quartz stones up to 100 mm in diameter.
Level to very gently undulating plain.
An interactive visualisation of the landscape in Briagolong is provided. Zooming and panning functionality is provided as well as the ability to click on icons to provide further information about the landscape (e.g. soils, geology) as well as access other panoramas in the study area.
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The original vegetation was a grassy open forest of red gum (Eucalyptus tereticornis). It has now largely been cleared.
This photo (facing north) shows the pattern of remaining vegetation and the overall near flat topography in this mapping unit.
This map unit was identified and named by Ward (1977). It is included within both the Redgum 1 and Redgum 2 Land Systems as described by Aldrick et al. (1992). Skene and Walbran (1948, 1949) mapped all of the higher land into the Tanjil series and has been subdivided into the Briagolong and Stratford map units in this report.
Most of the soils on this map unit are texture contrast soils. This means that they have light textured surface soils (loamy sands to sandy loams) abruptly overlying the clay subsoil. Stones throughout the profile (up to 100 mm in diameter) are a common feature of many of the soils, particularly on hill slopes and the flanks of drainage lines.
The surface soils are generally dark greyish brown loamy sands to sandy loams. They have a bleached subsurface (typically pale brown to pale brownish grey) of similarly textured material abruptly overlying mottled brown and yellow clays at about 20 to 30 cm. Red mottles generally occur at depth. Clays or sandy clays normally continue to at least 1 m, often accompanied by gravel and stones. These soils are generally classified as Yellow or Brown Sodosols.
Analysis for one pit on this map unit was examined (Site GP78) and can be viewed below. Detailed physical and chemical analysis for three other profiles within the Briagolong map unit are given by Aldrick et al. (1992) and Skene and Walbran (1948).
The surface pH’s of the soils are usually less than 6.0 and may be below 5.5. The pH’s in the clay subsoil are variable. Aldrick et al. (1992) found his profiles to have acidic subsoils less than pH 5.5. In comparison, Site GP78 became alkaline with depth. Exchangeable magnesium is the dominant cation in the subsoil and the ratio of calcium to magnesium decreases with depth. Generally the clay subsoils are also strongly sodic.
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Ca meq % | Mg meq % | K meq % | Na meq % | H meq% | ESP % | Gravel % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-10 | FSL | 5.1 | 0.32 | 0.17 | 2.5 | 3.1 | 1.1 | 0.5 | 0.1 | 23 | 46 | 18 | 9 | 2 | ||||
10-25 | SL&GR | 5.4 | 0.13 | 0.7 | 0.4 | 0.5 | 0.3 | 27 | 48 | 17 | 7 | 1 | ||||||
25-50 | MC | 6.7 | 0.19 | 0.8 | 11 | 0.5 | 2.5 | 17 | 10 | 26 | 15 | 48 | 2 | |||||
60-80 | MC | 7.7 | 0.25 | 0.2 | 9.2 | 0.2 | 3.4 | 16 | 8 | 29 | 19 | 42 | 1 | |||||
80-130 | 8 | 0.25 | 0.2 | 8.5 | 0.2 | 3.5 | 29 | |||||||||||
130+ |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Ca meq % | Mg meq % | K meq % | Na meq % | H meq % | ESP % | Gravel % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-3 | SL | 5.9 | 0.21 | .018 | 0.76 | 11.6 | 11.0 | 4.4 | 0.8 | 0.6 | 14.2 | 2 | 1 | 19 | 33 | 13 | 15 | |
10-15 | LS | 5.3 | 0.04 | .004 | 0.043 | 0.54 | 0.3 | 0.9 | 0.06 | 0.3 | 6.4 | 4 | 3 | 20 | 39 | 18 | 12 | |
15-20 | MC | 5.3 | 0.07 | .005 | 0.063 | 0.58 | 0.2 | 4.8 | 0.2 | 1.5 | 12.5 | 8 | 3 | 20 | 26 | 12 | 40 | |
60-90 | HC | 4.7 | 0.27 | .031 | 0.1 | 4.4 | 0.2 | 3.4 | 9.7 | 19 | 1 | 23 | 27 | 6 | 42 | |||
90-120 | SC | 4.5 | 0.42 | .051 | 0.1 | 5.9 | 0.2 | 4.6 | 10.3 | 23 | 1 | 8 | 35 | 11 | 44 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Ca meq % | Mg meq % | K meq % | Na meq % | H meq % | ESP % | Gravel % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-8 | LS | 5.9 | 0.06 | .004 | 0.149 | 2.10 | 18 | 39 | 37 | 12 | 7 | <1 | ||||||
8-20 | S | 6.2 | 0.04 | .003 | 63 | 40 | 39 | 13 | 6 | 1 | ||||||||
20-33 | GRS | 6.6 | 0.03 | .003 | 63 | 45 | 35 | 11 | 6 | 2 | ||||||||
36-61 | HC | 7.1 | 0.13 | .008 | 16 | 7 | 6 | 4 | 76 | 1 | ||||||||
61-109 | GRC | 6.5 | 0.10 | .009 | 66 | 53 | 12 | 4 | 29 | <1 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Ca meq % | Mg meq % | K meq % | Na meq % | H meq % | ESP % | Gravel % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-8 | SL | 6.9 | 0.12 | .007 | 0.144 | 2.00 | 5 | 31 | 46 | 15 | 8 | 1 | ||||||
8-18 | SL | 6.1 | 0.04 | .004 | 11 | 32 | 45 | 14 | 8 | 1 | ||||||||
18-30 | S | 6.3 | 0.05 | .006 | 46 | 36 | 43 | 15 | 7 | <1 | ||||||||
33-66 | HC | 6.3 | 0.38 | .041 | 1 | 7 | 8 | 3 | 74 | 1 | ||||||||
66-107 | HC | 7.9 | 0.37 | .049 | 8 | 20 | 18 | 5 | 53 | 1 | ||||||||
107-145 | MC | 8.2 | 0.47 | .064 | 2 | 22 | 20 | 4 | 50 | 1 |
Most of the soils are cleared and used for grazing. Some cropping is carried out near Briagolong. During wetter periods of the year, the surface soils may become saturated as the subsoil clay restricts the downward movement of water.
Gravel and stones in the deep subsoil within Briagolong mapping unit.
Red gum forest south of Briagolong. Note: weakly developed gilgai microrelief.