In addition, the Irondale soils are very stony and both Knobtop and Irondale soils are moderately deep to hard rock. Loughboro soils have colors of lower chroma and a clayey subsoil and are on nearly level uplands. Syenite soils are very bouldery and are on steeper upland side slopes. Moderately well drained. Runoff is medium.
Permeability is moderate in the upper part and very slow in the fragipan.
The majority of the area remains in native hardwood forest dominated by upland oaks. Those areas that are cleared are used for hay, pasture, and row crops. Fescue, orchard grass, and native grasses are the principal hay and pasture plants and wheat, corn, and grain sorghum are the principal cultivated crops. The series is of moderate extent. St. Francois County, Missouri, 1979.