Rock fragments range from 5 to 35 percent and are mostly stones. Structure is granular or crumb and consistence is soft or slightly hard. Reaction is very strongly acid or strongly acid and the horizon is less than 50 percent base saturated. The horizon usually has common distinct to prominent mottles. Texture is typically stony sandy loam, but the fine earth fraction ranges in clay from 5 to 18 percent and sand is over 52 percent.
Reaction ranges from extremely to strongly acid.
These are the Ptarmigan and Strain series. Ptarmigan and Strain soils are well drained, also Strain soils lack a lithic contact between depths of 20 to 40 inches. The Haverly soils are in concave to depressional areas in the alpine or seepage areas on steep slopes. Slopes graident ranges from 0 to 30 percent. The soil formed in parent materials weathered from underlying gneiss and schist bedrock or from thin glacial till overlying such rock.