The soils formed in glacial till mixed with loess and volcanic ash in the solum. The frost-free season is l40 to 200 days. These are the Barneston , Pastik , Ragnar , and Winston soils. These soils lack ortstein and are more than 60 inches deep. Also, Barneston soils are sandy-skeletal.
Pastik soils are coarse-silty.
Native vegetation is Douglas-fir, western hemlock, western redcedar, bigleaf maple, and red alder. Understory consists of western swordfern, salal, vine maple, huckleberry, trailing blackberry, Pacific trillium, western brackenfern, salmonberry, deerfern, ladyfern, and Oregon- grape. The soils are extensive. King County, Washington, l943. This series is the designated state soil for Washington State.