These are the Catman , Kyle , Mcnary , Swanboy , and Twotop series. Mcnary soils have hues of 7.5YR and yellower and are derived from basalt. Catman soils have hues of 10YR and yellower. Kyle, Swanboy, and Twotop soils all have hues of 2.5Y, are in LRR-G and are more moist in May and June. The Venzuni soils formed in alluvium derived from red bed shales of the Chinle Formation and the Glen Canyon Undivided Group.
Venzuni soils are on alluvial fans on valley sides and stream terraces on valley floors.
Slopes are 1 to 6 percent. Elevations range from 6,700 to 7,600 feet. The mean annual temperature is 46 to 51 degrees F., and the mean annual precipitation is 12 to 16 inches. The frost free period is 100 to 135 days. These are the Bryway , Galzuni , Nutreeah , Silcat , Toldohn and Vessilla soils.