These soils are on glaciated mountain sides and have slopes of 8 to 90 percent. Mean annual temperature is 44 degrees F and average annual precipitation is 75 inches. Depth to bedrock is 20 to 40 inches. Mean annual soil temperature is 45 to 47 degrees F. Soil reaction is strongly acid or moderately acid. Rock fragments including hard cinders in the control section average 35 to 70 percent by volume.
Structure is weak subangular blocky or is single grained.
Some pedons have an ash mantle up to 7 inches thick. Texture is very stony loamy sand, very stony sandy loam, or very gravelly loamy sand. Rock content ranges from 40 to 60 percent. The Bs1 is similar but can be gravelly loamy sand if formed in the ash mantle. Rock fragments range from 20 to 40 percent.