Subsequently, the dendritic streams eroded, and in the upper parts, were restricted to distinct valleys. Between the valleys the bedrock has been subject to weathering and erosion. The Western Coastal Plains consists of level to nearly level flood plains, level to gently sloping terraces, and nearly level to steep uplands. Increasing from south to north, the elevation ranges from 25 m to 200 m above sea level. The remainder is devoted to farmland, one-sixth being used for cropland.
Natural vegetation is pine-hardwood forests.
Dominant herbaceous species include Little bluestem and Pinhole bluestem. Other major grasses are beaked panicum, longleaf uniola, spike uniola, and yellow indiangrass. Many low-growing species of panicums, paspalums, and perennial forbs contribute to the total annual yield. Commonly grown crops include corn, grain sorghum, oats, soybeans, peanuts, rice, and vegetables. 133B. Soils Most soils in MLRA 133B developed from clayey loamy or sandy marine sediments.