Organic carbon in the upper 15 inches averages about 0.7 to 0.8 percent, and ranges from 0.3 to 1.2 percent. It is not dry in all parts of the moisture control section for at least 45 consecutive days following the summer solstice to October 20, and for at least 90 cumulative days during that period. It is neutral or slightly alkaline. Rock fragments range from 0 to 15 percent and are dominantly of gravel size. This horizon is neutral or slightly alkaline and has exchange capacity of 12 to 20 milli equivalents per 100 grams of soil.
Reaction is slightly alkaline through strongly alkaline.
Typically there is about 12 percent calcium carbonate equivalent in the strongest part and ranges from 8 to 20 percent. If any horizon contains over 15 percent calcium carbonate equivalent, it is below 40 inches. Balon , Decolney , and Spenlo soils lack free carbonates within depths of 40 inches. Bowbac , Cushman , Fattig , Flaco , Gaddes , Gapbutte , Hagerman , Pokeman , Progresso , Pugsley , Spangler , and Threetop soils have bedrock at depths of 20 to 40 inches. Buckle soils have sola over 40 inches thick.