Newcastle and Owens soils are underlain by shaly clay and lack a lithic contact. Leeray soils occur on divides or in valleys and have thicker sola and gilgai relief. Nukrum and Throck soils have sola more than 20 inches thick. Speck soils occur on nearly level and gently sloping areas and have Bt horizons. Runoff is medium to high.
Permeability is moderate.
Vegetation consists of sideoats grama, silver bluestem, indiangrass, buffalograss, little bluestem, and small mesquite trees. Mainly in the Eastern part of the Rolling Plains, Rolling Limestone Prairie and North central Prairie of Texas. The series is extensive. Calcic horizon - 5 to 13 inches.