Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 177. — The four drift sheets of Wisconsin. (Weid-man, Wise. Geol. Surv.) PRAIRIE PLAINS 471 lobate character of the ice margin, a feature imposed upon the conti-nental ice sheet by the irregularities of the topography which it depressions appear to have been lines of maximum flow, and in the. Fig. 178. — Distribution of glacial moraines and direction of ice movement In southern Michigan andnorthern Ohio and Indiana. (Russell and Leverett, U. S. Geol. Surv.) Great Lake regio
Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 177. — The four drift sheets of Wisconsin. (Weid-man, Wise. Geol. Surv.) PRAIRIE PLAINS 471 lobate character of the ice margin, a feature imposed upon the conti-nental ice sheet by the irregularities of the topography which it depressions appear to have been lines of maximum flow, and in the. Fig. 178. — Distribution of glacial moraines and direction of ice movement In southern Michigan andnorthern Ohio and Indiana. (Russell and Leverett, U. S. Geol. Surv.) Great Lake region this resulted in the strongly looped quality of themorainic systems as shown in Fig. 178. The extent to which drift deposits dominate the glacial topographyis further indicated by the fact that the present divide between theGreat Lakes or St. Lawrence drainage and the Mississippi drainage is 472 FOREST PHYSIOGRAPHY determined very largely by moraines and thick drift deposits. Thedrift is heaped up in greatest amounts at the ends and along the sidesof the Great Lake basins where it was accumulated on the margins oftongues or lobes of ice that once occupied the basins. Such modifi-cation of not only the drainage but also the topography and the soilsis clearly indicated by the nature of the drift covering in the south-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
