The Penn series consists of moderately deep, well drained soils formed in materials weathered from noncalcareous reddish shale, siltstone, and fine-grained sandstone normally of Triassic age. Slopes range from 0 to 60 percent.
Permeability is moderate or moderately rapid.
Mean annual precipitation is 43 inches. Penn silt loam - cropland. Solum thickness ranges from 17 to 34 inches. Depth to bedrock ranges from 20 to 40 inches. Rock fragment content, by volume, ranges from 2 to 30 percent in the A horizon, from 5 to 50 percent in individual horizons of the B, and from 30 to 90 percent in the C horizon, the control section average is less than 35 percent.