The Blair series consists of very deep, somewhat poorly drained, moderately slowly permeable soils on dissected till plains. They formed in silty, water-worked sediments, or in those sediments and the underlying till that contains a strongly developed paleosol. Slopes range from 2 to 20 percent. 38 degrees 10 minutes 55 seconds N. and long. The depth to the base of the argillic horizon is 40 to 68 inches.
Texture is silt loam or loam, except some eroded pedons are silty clay loam or clay loam.
Clay content is 20 to 35 percent. Reaction is strongly acid to slightly acid except in pedons that have been limed range to neutral. In some eroded pedons the E horizon has been mixed into the Ap horizon. Clay films have chroma of 2 or 3 in the upper part and 1 or 2 in the lower part. The Bt horizon is silty clay loam, silt loam, clay loam, or loam.