Becket is the only series currently in the same family. Becket soils have greater than 20 percent sandy lenses or strata in the Cd horizon. They may be competing series when they are assessed for isotic mineralogy. All of these soils except for Mundelite are from outside of Region R and have argillic horizons. Mundalite soils have spodic horizons thicker than 18 inches.
Marlow soils are nearly level to very steep soils on drumlins and uplands.
Slope ranges from 0 to 60 percent, but commonly is less than 35 percent. The soils formed in compact, loamy glacial till derived mainly from mica schist, granite, and phyllite. The climate is humid and cool temperate. Mean annual temperature ranges from 38 to 45 degrees F., mean annual precipitation ranges from 30 to 50 inches, and the frost-free season ranges from 90 to 160 days. These are the Berkshire , Colonel , Hermon , Monadnock , Peacham , Peru , Pillsbury , Sunapee , and Tunbridge soils.