Forest physiography; physiography of the United States and principles of soils in relation to forestry . ctural features are open folding and exten-sive faulting. They are known to extend from the Belt Mountainswestward to the Purcell trench. Some of the ranges (Purcell, Cabinet,Coeur dAlene, Livingston, and Lewis) are composed almost entirely ofthis group of rocks. In central Idaho the same strata are invaded,displaced, and probably for the most part cut off by a great granitebatholith.^ The most striking structural feature of the western part ofthe sediments east of the Purcell trench is of
Forest physiography; physiography of the United States and principles of soils in relation to forestry . ctural features are open folding and exten-sive faulting. They are known to extend from the Belt Mountainswestward to the Purcell trench. Some of the ranges (Purcell, Cabinet,Coeur dAlene, Livingston, and Lewis) are composed almost entirely ofthis group of rocks. In central Idaho the same strata are invaded,displaced, and probably for the most part cut off by a great granitebatholith.^ The most striking structural feature of the western part ofthe sediments east of the Purcell trench is of course the existence ofgreat faults of northwest trend that determine the courses of the trenchesand rivers and block out the individual mountain ranges. 1 Daly, loc. cit., p. 599. = Ransome and Calkins, Geology and Ore Deposits of the Coeur dAlene District, Idaho,Prof. Paper U. S. Geol. Surv. No. 62, 1908, p. 16. W. Lindgren, A Geological Reconnaissance across the Bitterroot Range and ClearwaterMountains in Montana and Idaho, Prof. Paper U. S. Geol. Surv. No. 27, 1904, p. 16. ROCKY MOUNTAINS, I 303. Fig. 88. — Coeur d^Mene Aluuntains, looking from above Wardner. Shows the mature dissection of aplateau-Iike uplift. (Ransome and Calkins, U. S. Geol. Surv.)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
