The 10 to 40 inch control section has 27 to 35 percent clay. Soil reaction is very strongly acid or extremely acid. The umbric epipedon is 12 to 20 inches thick. Structure is subangular blocky or granular. It is silty clay loam or clay loam and contains 20 to 80 percent soft siltstone fragments.
Structure is angular or subangular blocky.
These are the Astoria , Boistfort , Bunker , Elochoman , Ilwaco , Kinney , Knappton , Lebam , LeBar, Lytell , Narel , Silcox , Swem , Sylvia , Vesta , Wahkiakum, Wellman , Willapa , and Zenker series. Astoria, Boistfort, Lebam, and Vesta soils have more than 35 percent clay in the control section. Bunker, Kinney, and Knappton soils average more than 15 percent hard rock fragments in the control section. Elochoman and Ilwaco soils have less than 15 percent soft rock fragments in the control section. LeBar soils lack rock fragments and have strong structure in the B2 horizon.