The Martinsburg series consists of deep, well or moderately well drained, moderately permeable soils formed in silty colluvium on foot slopes. Slopes range from 2 to 9 percent. Mean annual temperature is about 50 degrees F, and mean annual precipitation is about 34 inches. The solum typically is more than 60 inches thick but ranges from about 48 to 90 inches in thickness.
Carbonates are absent in the solum.
The solum is medium acid or strongly acid in the most acid part. The A horizon is silt loam with about 20 to 24 percent clay. The E horizon has hue of 10YR, value of 4 or 5, and chroma of 3 or 4. It is silt loam with about 18 to 24 percent clay. A BE horizon is in some pedons.