The foothills of the Darling Scarp are dominated by gravelly and sandy soils. The Darling Scarp consists of very steep slopes with shallow red and yellow earths and rock outcrops. The lateritic uplands are dominated by gravels, sands and duricrust, forming a gently undulating surface. Shallow upland valleys are made up of grey sands and with swampy land in the lower lying valley floors. The minor valleys of the Darling Plateau to the west consist of sandy gravels on slopes and orange earths on swampy floors. In the south-eastern part, the soil is yellow duplex, with red earths on slopes and narrow alluvial terrace. Deep dissections occurring on the plateau forms the major valleys. Here the dominant soils are red and yellow earths on slopes with narrow alluvial terraces.