Geology |
This photo shows the coarse sediments from the Avon River [recent coarse river sediments (rc) map unit] flanked by the finer textured sediments from the Avon River [Thomson (Th) map unit]. The road in the right middle ground is Pearces Lane. Maffra is in the right background. | This photo shows an abandoned former channel of the Avon River. Most of the foreground is the Thomson map unit. The Clydebank map unit (right middle ground) is an earlier river terrace. The right background has been mapped as the Coongulla map unit and the Briagolong map unit. These are Tertiary sediments and an old river terrace respectively. |
Landform Flood plain. Numerous abandoned river channels flanked by natural levees are a feature of this map unit. Original Vegetation The original vegetation has been described as riverine scrubs and swamps as well as treeless grasslands (Lunt, 1997). A few remnant forest red gum (Eucalyptus tereticornis) remain. Previous Maps and Reports Skene and Walbran (1948, 1949) classified the soils of this map unit into Thomson silty clay and Thomson silty clay loam. Aldrick et al. (1992) mapped the area as Maffra 1 Land System which includes the Thomson and Newry map units of this report. | Myrtlebank Road crossing the Thomson River. |
Depth cm | Texture | pH | EC dS/m | Ca meq% | Mg meq% | K meq% | Na meq% | H meq% | ESP % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-25 | FSL | 5.7 | 0.22 | 10.0 | 2.9 | 0.2 | 0.3 | 11.0 | 1 | 2 | 52 | 19 | 18 | 3 |
25-40 | FSCL | 6.4 | 0.09 | 8.3 | 4.4 | 0.1 | 0.3 | 8.7 | 1 | 2 | 41 | 25 | 25 | 2 |
40-60 | LC | 5.9 | 0.09 | 5.7 | 6.1 | 0.1 | 0.4 | 11.0 | 2 | 2 | 17 | 36 | 39 | 2 |
60-100 | ZLC | 5.8 | 0.08 | 4.1 | 6.1 | 0.1 | 0.4 | 3.4 | 3 | 2 | 18 | 38 | 38 | 1 |
100-120 | ZLC | 6.6 | 0.10 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Ca meq% | Mg meq% | K meq% | Na meq% | H meq% | ESP % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-10 | FSCL+ | 5.6 | 0.27 | <.02 | 0.47 | 4.7 | 10 | 5.5 | 0.4 | 0.3 | 16.0 | 1 | 3 | 19 | 34 | 33 | 3 |
10-30 | FSCL+ | 5.9 | 0.09 | 0.22 | 2.6 | 6.1 | 5.3 | 0.3 | 0.5 | 11.0 | 2 | 3 | 27 | 29 | 35 | 2 | |
30-60 | ZCL | 6.0 | 0.14 | 3.7 | 5.6 | 0.2 | 0.7 | 1.9 | 6 | 4 | 37 | 28 | 29 | 1 | |||
60-90 | FSCL | 6.5 | 0.56 | 0.08 | 2.2 | 5.6 | 0.1 | 1.1 | 13 | 2 | 49 | 25 | 24 | 1 | |||
90+ | FSCL | 8.7 | 0.49 | 0.06 | 1.5 | 4.1 | 0.1 | 1.1 | 36 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Ca meq% | Mg meq% | K meq% | Na meq% | H meq% | ESP % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0- 30 | CL | 5.4 | 0.45 | 0.40 | 5.0 | 16.0 | 4.8 | 2.2 | 0.2 | 4 | 21 | 36 | 30 | 3 | |||
30-50 | CL | 6.0 | 0.35 | 0.14 | 2.7 | 14.0 | 5.0 | 1.7 | 0.2 | 8.1 | 2 | 22 | 37 | 33 | 4 | ||
50-90 | CL | 7.5 | 0.45 | 5.4 | 2.1 | 1.7 | 0.3 | 4 | 11 | 41 | 28 | 20 | 1 | ||||
90+ | FSCL | 8.3 | 0.81 | 4.7 | 4.6 | 0.3 | 1.6 | 15 | 1 | 41 | 33 | 25 | 1 |
Depth cm | Texture | pH | EC dS/m | Nitrogen % | Carbon % | Ca meq% | Mg meq% | K meq% | Na meq% | H meq% | ESP % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-30 | FSCL | 5.9 | 0.12 | 0.38 | 4.0 | 10.0 | 2.9 | 0.9 | 0.2 | 4 | 44 | 24 | 21 | 2 | ||
30-50 | CL | 6.3 | <0.05 | 0.10 | 2.4 | 10.0 | 2.8 | 0.3 | 0.2 | 8.6 | 1 | 2 | 51 | 23 | 20 | 2 |
50-90 | CL | 6.8 | <0.05 | 10.0 | 3.2 | 0.2 | 0.2 | 2 | 2 | 52 | 22 | 19 | 2 | |||
90+ | FSCL | 7.1 | <0.05 | 7.3 | 4.1 | 0.1 | 0.2 | 2 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-18 | ZCL | 6.5 | 0.13 | .006 | 0.358 | 4.84 | 2 | 12 | 36 | 39 | 2 |
18-38 | ZLC | 6.3 | 0.08 | .006 | 2 | 11 | 35 | 43 | 2 | ||
38-64 | ZC | 6.9 | 0.12 | .017 | 2 | 12 | 35 | 45 | 2 | ||
64-114 | ZC | 8.6 | 0.23 | .030 | 1 | 13 | 41 | 41 | 1 | ||
114-165 | ZC | 8.7 | 0.37 | .060 | 1 | 13 | 42 | 42 | 2 | ||
165-236 | ZC | 8.5 | 0.44 | .072 | 2 | 15 | 36 | 41 | 2 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-15 | ZCL | 5.4 | 0.28 | .016 | 0.196 | 4.84 | 1 | 5 | 33 | 44 | 2 |
15-28 | ZCL | 5.5 | 0.17 | .008 | 1 | 5 | 33 | 48 | 2 | ||
28-38 | ZLC | 5.8 | 0.14 | .16 | 2 | 8 | 32 | 48 | 2 | ||
38-71 | ZC | 5.8 | 0.17 | .022 | 2 | 7 | 35 | 49 | 2 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-15 | ZLC | 5.9 | 0.15 | .019 | .158 | 4.23 | 2 | 18 | 35 | 42 | 3 |
15-36 | ZLC | 6.1 | 0.13 | .018 | 2 | 18 | 29 | 45 | 2 | ||
36-66 | ZC | 5.8 | 0.22 | .038 | 1 | 16 | 29 | 49 | 1 | ||
66-173 | ZC | 7.1 | 0.39 | .060 | 1 | 13 | 34 | 49 | 1 |
Depth cm | Texture | pH | EC dS/m | Cl % | Nitrogen % | Carbon % | Coarse sand % | Fine sand % | Silt % | Clay % | LAT % |
0-10 | ZCL | 5.7 | 0.16 | .012 | 0.583 | 7.72 | 3 | 9 | 33 | 37 | 2 |
10-25 | ZLC | 5.7 | 0.09 | .009 | 2 | 10 | 36 | 41 | 1 | ||
25-84 | ZMC | 6.4 | 0.48 | .087 | 1 | 10 | 37 | 44 | 1 | ||
84-152 | ZMC | 8.4 | 0.54 | .096 | 3 | 11 | 39 | 44 | 1 | ||
183-213 | LC | 8.4 | 0.19 | .027 | 5 | 36 | 37 | 28 | 1 | ||
213-244 | FSC | 8.1 | 0.11 | .014 | 6 | 41 | 30 | 22 | <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 % |
0-10 | CL | 5.4 | 0.12 | .011 | 0.46 | 6.96 | 5.5 | 4.7 | 0.7 | 0.7 | 20.9 | 2 | 3 | 4 | 21 | 30 | 35 |
20-30 | MC | 5.6 | 0.06 | .005 | 0.26 | 2.85 | 5.8 | 4.4 | 0.2 | 0.8 | 18.7 | 3 | 3 | 17 | 31 | 45 | |
60-90 | HC | 8.0 | 0.39 | .045 | 5.0 | 7.2 | 0.1 | 4.3 | 0.8 | 25 | 1 | 26 | 37 | 37 | |||
95-120 | SC | 8.8 | 0.44 | .054 | 1.9 | 4.1 | 0.2 | 3.2 | 0 | 34 | <1 | 58 | 21 | 20 |
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 % |
0-10 | LC | 5.7 | 0.043 | .005 | 0.27 | 4.76 | 8.7 | 2.9 | 0.5 | 0.3 | 15.2 | 1 | 4 | 4 | 31 | 27 | 31 |
20-30 | MC | 6.2 | 0.031 | .003 | 0.15 | 1.79 | 10.1 | 3.3 | 0.3 | 0.3 | 9.0 | 1 | 1 | 36 | 30 | 30 | |
35-60 | SC | 6.7 | 0.023 | .002 | 6.8 | 2.8 | 0.2 | 0.3 | 4.0 | 2 | 3 | 45 | 27 | 23 | |||
90-120 | LSC | 7.3 | 0.035 | .002 | 5.3 | 3.4 | 0.2 | 0.6 | 3.3 | 5 | 1 | 44 | 32 | 24 |
Intensive cropping in the Avon River flats near Boisdale. |