All of these soils are deeper than 20 inches to bedrock. Delassus and Killarney soils are on lower slopes. Irondale soils are on similar positions and Knobtop soils are on higher positions. Runoff is very high. Permeability is moderate.
Areas remain in native grasses, shrubs and a few stunted hardwoods.
Some acreage was included in mapping with the Irondale series in St. Francois County, Missouri. The series is of moderate extent. Iron County, Missouri, 1985.