Forest physiography; physiography of the United States and principles of soils in relation to forestry . ed plants of this district.^ It is of interest to note here that thesubtropical region enters the United States at two other points besidesFlorida — the lower Rio Grande region in Texas and the lower ColoradoRiver Valley in western Arizona and southeastern California. 1 Matson and Clapp, 2d Ann. Rept. Fla. State Geol. Surv., 1909, pp. 37-43. 2 Idem, p. 45- C. H. Merriam, The Geographical Distribution of Life in North America with SpecialReference to the Mammalia, Proc. Biol. Soc. Wash., vol
Forest physiography; physiography of the United States and principles of soils in relation to forestry . ed plants of this district.^ It is of interest to note here that thesubtropical region enters the United States at two other points besidesFlorida — the lower Rio Grande region in Texas and the lower ColoradoRiver Valley in western Arizona and southeastern California. 1 Matson and Clapp, 2d Ann. Rept. Fla. State Geol. Surv., 1909, pp. 37-43. 2 Idem, p. 45- C. H. Merriam, The Geographical Distribution of Life in North America with SpecialReference to the Mammalia, Proc. Biol. Soc. Wash., vol. 7, 1892, p. $3- ^ C. H. Merriam, The Geological Distribution of Animals and Plants in North America,Yearbook Dept. Agri., 1894, p. 211; idem, Life Zones and Crop Zones of the United States. CHAPTER XXVII LAURENTIAN PLATEAU AND ITS OUTLIERS IN THEUNITED STATES Laurentian Plateau TOPOGRAPHIC FEATURES, The Laurentian Plateau includes all the country north of LakeSuperior, Lake Ontario, and the St. Lawrence line, as far as Hudson Bayand the Arctic shore of Canada; east and west it extends from Lakes. Fig. 222. — Chiefly metamorphic and igneous rocks within the heavy lines, chiefly sedimentary rockswithout; the Laurentian peneplain is dotted. (Wilson.) Athabaska, Manitoba, etc., to the Labrador coast. Its boundaries areindicated on Fig. 222 and include about one million square milesof land. It embraces practically the whole northeastern section ofNorth America. Two outliers of the province lie in the United States: 554 LAURENTIAN PLATEAU AND ITS OUTLIERS 555 (i) the Superior Highlands of northern Wisconsin,northwestern Michigan,and northern Minnesota, and (2) the Adirondacks of northeastern NewYork, while it is practically continuous with the New England Plateauof related origin and character. Indeed the history of this great topo-graphic province is intimately associated with, and its forms are inmany respects similar to, those of a considerable portion of the Appa-lachian re
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