Slope gradients are dominantly less than 9 percent but range from 1 to 50 percent. The soils formed in residuum from acid sandstone with thin beds of clayey and sandy shales. Mean annual temperature ranges from 59 to 63 degrees F, and mean annual precipitation ranges from 35 to 45 inches. These are the Barco , Barden , Bates , Collinsville , and Hector soils. Barco soils are in a mollic subgroup and are on similar landscapes.
Barden soils are higher in the landscape and are in the fine particle size family.
Bates soils are on similar landscapes and have a mollic epipedon. Collinsville soils are on steeper side slopes and have bedrock within a depth of 20 inches. Hector soils are lower in the landscape and have bedrock within a depth of 20 inches. Permeability is moderate. Runoff is medium to high.