The Jackson series consists of very deep, moderately well drained soils which are deep to sandy alluvium on stream terraces and lake terraces. These soils formed mostly in silty alluvium underlain by stratified sandy alluvium.
Permeability is moderate in the silty and loamy alluvium and rapid in the sandy alluvium.
Slopes range from 0 to 6 percent. Mean annual precipitation is about 30 inches. Jackson silt loam - on a 2 percent slope in a cultivated field at an elevation of about 720 feet. 8, T. 9 N., R. 1 W., or 800 feet east and 200 feet north of 60 degree bend in county road. Thickness of the silty alluvium, depth to the base of the argillic horizon, and depth to sandy alluvium all range from 40 to 60 inches.