Barx, Clovis, and Fernando soils have calcic horizons deeper than 20 inches. Los Alamos soils have 5 to 35 percent pumice pebbles. Millett and Tuweep soils are skeletal below 20 inches. Scholle soils have 15 to 35 percent rock fragments. Sundance soils have buried soils in the control section.
Tapia soils have lime cemented rock fragments.
Toluca soils have sola less than 20 inches deep. Cerrillos soils are on gently sloping knolls and fan terraces at elevations of 5,500 to 7,000 feet. The soils formed in medium to moderately fine textured sediments of alluvial and colluvial materials. The sediments originated principally from acid igneous material with some shale and sandstone additions. The climate at the type location is semiarid continental with mean annual precipitation of 10 to 15 inches.