Thornthwaite P-E indices range from 36 to 44. These are the Hensley , Lindy , Nuvalde , Palopinto , Set , Tarrant , and Thurber series. Hensley and Lindy soils have reddish, clayey argillic horizons and are on positions similar to Leeray soils. Nuvalde soils have fine-silty control sections and are on similar positions. Palopinto and Tarrant soils have sola less than 20 inches thick over a lithic contact of limestone bedrock and are above on hillsides and ridgetops.
Set soils have fine-silty control sections and are above on knolls and escarpments.
Thurber soils have clayey argillic horizons and are on similar or slightly lower positions. Permeability is very slow. Runoff is low on slopes less than 1 percent, medium on 1 to 3 percent slopes and high on 3 to 5 percent slopes. Water enters to soil rapidly when it is dry and cracked, and very slowly when it is moist. Small grains, forage sorghums, and grain sorghums are the main crops.