A 2Btg horizon is in some pedons. Gravel content in the Btg horizons ranges from 5 to 35 percent in any one subhorizon, but averages 15 to 35 percent. Reaction ranges from slightly acid to slightly alkaline. It is loam, clay loam or silty clay loam. Gravel content ranges from 0 to 5 percent.
Reaction is slightly alkaline or moderately alkaline.
These are the Barry , Brookston , Buntingville , Clackamas , Cordova , Hamel , Jameston , Marengo , Millgrove , Navan , Rensselaer , and Westland series. Barry soils contain less than 27 percent clay in the lower part of the argillic horizon. Brookston and Cordova soils contain less than 10 percent gravel in the argillic horizon. Clackamas soils do not contain free carbonates within 60 inches. Marengo soils average less than 15 percent rock fragments in the argillic horizon.