The Jameston series consists of deep, poorly drained soils formed in loamy sediments and the underlying loamy glacial till on uplands.
Permeability is moderate in the upper sediments and moderately slow in the till.
Slopes range from 0 to 2 percent. Mean annual temperature is about 45 degrees F, and mean annual precipitation is about 33 inches. Jameston silty clay loam on a concave slope of about 1 percent - pasture. Solum thickness ranges from 40 to 60 inches. Depth to carbonates ranges from 30 to 50 inches.