Irrigation has allowed farming of large areas of level sandy land. Some of these soils are prone to erosion by wind after removal of vegetation cover. Many of the present forests are dominated by a mix of white, red, and bur oaks. Rare communities include oak barrens, wet mesic prairie, fens, and coastal plain marshes. Fens occur commonly within this sub-subsection.
Wind erosion can be a serious problem on many of the sandy soils after clearing for agriculture.