. Soil physics and management. benefth-mdH,^ wl?l^°^k^ ^^^ black Sangaiaun soil with the Illinois glacial driftiCs Tf. Lrveieu!V;irGfors;.;ve?.)^ ^ ° ^ the surface. Fig 45,—a section sh„^Mnn (a) Rl„.,n,inKton Kra^ el (b) Sh, Un Mile till sheLt lul a anloess; (d) Sangamon soil, (e) Silt below ceat (Dr Samuel Cahin, U. SGeol Survey.) 50 SOIL PHYSICS AND MANAGEMENT during which the surface loess was changed inco soil which waslater buried in part b} subsequent glaciers. The soils and peat bedsof the Peorian stage contain remains of cedar trees which grew Inthe extensive swamps that

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. Soil physics and management. benefth-mdH,^ wl?l^°^k^ ^^^ black Sangaiaun soil with the Illinois glacial driftiCs Tf. Lrveieu!V;irGfors;.;ve?.)^ ^ ° ^ the surface. Fig 45,—a section sh„^Mnn (a) Rl„.,n,inKton Kra^ el (b) Sh, Un Mile till sheLt lul a anloess; (d) Sangamon soil, (e) Silt below ceat (Dr Samuel Cahin, U. SGeol Survey.) 50 SOIL PHYSICS AND MANAGEMENT during which the surface loess was changed inco soil which waslater buried in part b} subsequent glaciers. The soils and peat bedsof the Peorian stage contain remains of cedar trees which grew Inthe extensive swamps that existed at that time. (e) Early Wisconsin Glaciation, Loess and InterglacialStage.—The Peorian stage was ended by another ice advance knownas the Early Wisconsin (Fig. 45), which came from the Labra-dorean center of accui^iulation and formed a very extensive advancereaching into Iowa, Illinois, Indiana, Ohio, Pennsylvania and cov-ering practically all of A^ew York and the Xew England glacier built up a system of moraines in the middle west thatis one of the most characteristic features. The terminal moraineof the greatest advance is usually a distinct

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1917