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Soil Geology Association | Description |
| Association 1 | Soils associated with Cambrian Rocks |
| Association 2 | Soils associated with Silurian & Devonian Sediments |
| Association 3 | Soils associated with Devonian Extrusives |
| Association 4 | Soils associated with Devonian Granite Rocks |
| Association 5 | Soils associated with Carboniferous Sediments |
| Association 6 | Soils associated with Tertiary Sediments |
| Association 7 | Soils associated with Quaternary Basalt |
| Association 8 | Soils associated with Older Alluvial Sediments |
| Association 9 | Soils associated with Recent Alluvium |