They formed in interglacial sediments of Aftonian age.
Permeability is moderate.
Slope ranges from 5 to 25 percent. Mean annual temperature is 53 degrees F and mean annual precipitation is about 30 inches. Malcolm silt loam, with a 6 percent west-facing slope in pasture. Thickness of the solum ranges from 20 to 40 inches. The mollic epipedon often extends into the Bt horizon and ranges from 7 to 15 inches in thickness.