Chuska soils have a noncalcareous upper sola and a 4 to 12 inch thick indurated duripan. Argalt, Bruncan, Colthorp and Packwood soils have bedrock within 40 inches. Dewar soils have 27 to 35 percent clay in the control section and are 14 to 20 inches deep to a duripan. Pipeline soils have less than 15 percent coarse fragments in the control section and are noncalcareous in the upper sola. Thoms soils lack secondary lime in the solum and have neutral to slightly acid profiles.
Grassval soils are on fan piedmont remnants.
These soils formed in alluvium from mixed rock sources. Elevations are 5,300 to 7,400 feet. Slopes are 2 to 15 percent. The climate is cool, semiarid with warm, dry summers and cool, moist winters. These are the Oxcorel , Wieland , and Zaidy soils.