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4b INTERGRADE Alluvium altitude areas black amorphous peat brown podzolic Calluna cent Cirsium vulgare classification clayey Clocaenog coarse scree colluvium colour concave convex crop deep peat Devonian ericaceous especially evapotranspiration extensive FLUSHED JUNCUS BOG forest fragments freely drained glacial gley soils grasses Hafren hilltops Holcus horizons humus Inadequate aeration INTERGRADE IRONPAN SOIL layer Lead mining spoil Less than 45 loamy scree LOWLAND BROWN EARTH lowland zone lua Upland brown maps mid Wales middle slopes mineral soil MOLINIA BOG mottled mudstone NON-FLUSHED SPHAGNUM BOG occasionally occur ochreous Ordovician pale grey parent material peat over rock PEATY GLEY Phosphate Plate plateau poorly drained rainfall region rock and coarse rootable depth rooting scree Shallow bedrock Silurian Sitka spruce slaty soil types STEEP BROWN EARTH subsoil surface SURFACE-WATER GLEY Table thin top height topex topography topsoil Tywi UPLAND BROWN EARTH upland zone upper slopes Usually over 60 vegetation windsnap windthrow hazard