Biographical Memoir of John Wesley Powell 1834 1902

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VIII plemented in the "Physiographic Regions" by the statement that the Rocky Mountains terminate in northern New Mexico, where the Basin Ranges stretch far southeastward to meet the southwestern border of the Great Plains. Subordinate changes in Powell's boundaries and subdivisions may of course be made, as in the interpolation of the group of domed mountains in western North Carolina between the Piedmont plateau and the Appalachian ridges, or in the separation of the highlands of northern Min...nesota and upper Michigan from the Lake plains farther southeast ; but in the main the demar- cation of the provinces here indicated in text and map consti- tutes a permanent advance in American physiography^ How singular that a practiced observer, keen enough to see that the Rocky Mountains end southward in New Mexico, should not have, as a writer for teachers, moderated -the hyperbolic pero- ration which in the last lines of this essay described the Cali- fornia coast ranges as a province /^ where the balm of the tropics bathes the winter with verdure, and boreal zones boon the summer with zephyrs K^ It was in connection with the explanatory or rational de- scription of land forms in terms of their past history as de- pendent on underground rock-structure and external erosive processes, that Powell ingeniously applied his analytical method in a reversed direction, as if confident that a good rule must work both ways, for he frequently inferred the past history of a district from its present form.

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