Forest physiography; physiography of the United States and principles of soils in relation to forestry . phic history of the region, are conditions which form anadequate basis for the common association of the separate units underthe group name of the northern Rockies of the United States; butthere are wide differences in local detail, in the quality of the moun-tain slopes, the length and disposition of transverse valleys, and thedegree of dissection which the individual ranges have suffered. It there-fore becomes necessary to distinguish the essential elements of form andthe limits of each u
Forest physiography; physiography of the United States and principles of soils in relation to forestry . phic history of the region, are conditions which form anadequate basis for the common association of the separate units underthe group name of the northern Rockies of the United States; butthere are wide differences in local detail, in the quality of the moun-tain slopes, the length and disposition of transverse valleys, and thedegree of dissection which the individual ranges have suffered. It there-fore becomes necessary to distinguish the essential elements of form andthe limits of each unit in the system. 1 F. C. Calkins, A Geological Reconnaissance in Northern Idaho and Northwestern Mon-tana, Bull. U. S. Geol. Surv. No. 384, 1909, p. 12. 2 The United States Geographic Board makes the term Rocky Mountain System embracethe whole of the mountainous region between the Rio Grande and the 49th parallel, specifi-cally the ranges of western Texas, New Mexico, Colorado, Wyoming, Idaho, and this book the Trans-Pecos Highlands are set ofif as a separate province. (See p. 3S7.) 208. Fig. 85. — Mountain systems and ranges and intermontane trenches, northern Rockies.(Ransome, U. S. Geol. Surv.)
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