Forest physiography; physiography of the United States and principles of soils in relation to forestry . the Great Lake region its borders are covered with forests of deciduous hardwood.^ The uniformity of level, the prevailing absence of soils, and the widespread occurrence of lakes, favor uniform life conditions through- 1 R. M. Bell, The Geographical Distribution of Forest Trees in Canada, Scottish , vol. 13, 1897, pp. 281-296. 572 FOREST PHYSIOGRAPHY out the region, a fact well shown by the widespread distribution of thefur industry, which is also favored by the equally widespread
Forest physiography; physiography of the United States and principles of soils in relation to forestry . the Great Lake region its borders are covered with forests of deciduous hardwood.^ The uniformity of level, the prevailing absence of soils, and the widespread occurrence of lakes, favor uniform life conditions through- 1 R. M. Bell, The Geographical Distribution of Forest Trees in Canada, Scottish , vol. 13, 1897, pp. 281-296. 572 FOREST PHYSIOGRAPHY out the region, a fact well shown by the widespread distribution of thefur industry, which is also favored by the equally widespread forestgrowth, while the network of navigable streams and lakes makes com-munication relatively easy as unsettled countries go. Superior Highlands After consideration of the topographic, drainage, and soil conditionsof the Laurentian area of Canada the features of the Superior High-lands may be easily appreciated, for this physiographic province is buta part, strictly speaking, of the great Laurentian area of Canada. Likethe latter, its sky line is distinctly even and gives little hint of the moun-. Fig. 229. —Typical drainage irregularities in the Lake Superior Highlands.(U. S. Geol. Surv.) tainous structures that prevail almost everywhere within it. Its prin-cipal topographic feature is an uplifted and dissected plain of erosionwhich has been glaciated and hence has many secondary features dueto ice erosion. It lies neither in the region of pronounced glacial aggra-dation nor in that of intense glacial denudation; hence those forms thatare of glacial origin are due in some cases to ice scour, in others to iceaccumulation. A certain amount of glacial detritus occurs here andthere; in other localities the surface is swept practically clean by gla- LAURENTIAN PLATEAU AND ITS OUTLIERS 573 cial erosion. The glacial material is irregularly disposed in character-istic fashion and blocks the drainage to such an extent that lakes andponds occur in large numbers. The most common type
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
