These soils formed in glacial till derived principally from phyllite, calcareous metasiltstone and metasandstone, and metalimestone.
Permeability is moderate.
Slope ranges from 0 to 25 percent. Mean annual temperature is about 41 degrees F, and mean annual precipitation is about 44 inches at the type location. Penquis silt loam, on an easterly slope of 8 percent in a wooded area. 45 degrees 09 minutes 44 seconds N, and long. Depth to bedrock ranges from 20 to 40 inches and solum thickness ranges from 18 to 30 inches.