It is typically silt loam or silty clay loam but includes very fine sandy loam, loam, and clay loam. Reaction is slightly alkaline or moderately alkaline. Some pedons have thin strata of very fine sandy loam, fine sandy loam, or loamy fine sand. Carbonate concretions are in the AC and C horizons in some pedons. Below a depth of 40 inches the Cg horizon is stratified loamy fine sand, loamy sand, or fine sand in places.
Reaction ranges from slightly alkaline through strongly alkaline.
These are the Pahranagat and Paranat series in the same family. Pahranagat and Paranat have less carbonates throughout the series control section and receive less than 12 inches annual precipitation. Gibbon soils are nearly level and on flood plains. Slope gradients range from 0 to 2 percent. The soils formed in calcareous, stratified alluvium.