Michigamme, Rawsonville and Tunbridge soils have a lithic contact at 20 to 40 inches. Revel soils are on mountain backslopes, ridges, and plateaus at elevations of l,200 to 2,200 feet. Slopes are 5 to 60 percent. The soils formed in volcanic ash and colluvium and slope alluvium from sandstone, siltstone, and glacial till. Revel soils are in a marine climate.
Summers are warm and dry.
Winters are cold and wet with snow cover lasting from December through March. Average annual precipitation is 45 to 65 inches. The frost-free season is l20 to l50 days. These are the competing Welcome soils and the Cathcart , Getchell , Nati , and Squalicum soils. Cathcart soils are mesic and deep to a paralithic contact.