Reaction is slightly acid or neutral with little or no increase in pH above 50 inches. Textures are loam, clay loam, or sandy clay loam. Auzqui, Babb, Dewville, Redcloud, Thayne, and Tilton soils are calcareous within their control sections. Bynum, Teton, and Wrenman soils have a lithic or paralithic contact at depths of 20 to 40 inches. Tampico soils formed in sediments washed from granite and have 5 to 20 percent rock fragments, mainly of gravel size.
Irondyke soils have a xeric moisture regime, and formed from volcanic ash over glacial till.
Uhl soils have less than 15 percent rock fragments in the particle-size control section. Tamp soils lack flagstones and have moisture control sections that are dry in most parts about half the time when the soil temperature is greater than 41 degrees F. at 20 inches. Emerald soils are on alluvial fans and valley sideslopes. Slopes range from 0 to 65 percent. The soil formed in alluvial sediments derived from sandstone, interbedded sandstone, shale, and basaltic materials.