Forest physiography; physiography of the United States and principles of soils in relation to forestry . Geol. Surv., pt. 2, 1899-igoo, p. 175. Idem, p. 176. * Darton and Salisbury, Cloud Peak-Fort McKinney Folio U. S. Geol. Surv. No. 142,1906, p. II, col. 3. ROCKY MOUNTAINS. II 355 occurs at 6000 feet, and the cold timber line at 10,000 feet, so that theupper portions of the range do not generally support a timber coveringof any importance, but on the whole expose bare rock-strewn wood of the white pine, the predominating species, is coarse-grained,knotty, and small. The lumber wa
Forest physiography; physiography of the United States and principles of soils in relation to forestry . Geol. Surv., pt. 2, 1899-igoo, p. 175. Idem, p. 176. * Darton and Salisbury, Cloud Peak-Fort McKinney Folio U. S. Geol. Surv. No. 142,1906, p. II, col. 3. ROCKY MOUNTAINS. II 355 occurs at 6000 feet, and the cold timber line at 10,000 feet, so that theupper portions of the range do not generally support a timber coveringof any importance, but on the whole expose bare rock-strewn wood of the white pine, the predominating species, is coarse-grained,knotty, and small. The lumber warps and cracks considerably, and itis therefore not regarded as valuable.^ • For detailed distribution of the timber of the Bighorns, etc., see 19th Ann. Rept. U. Surv., pt. 5. CHAPTER XX ROCKY MOUNTAINS. Ill Southern Rockies In contrast to the irregularly arranged mountains of the CentralRockies with variable trend, numerous offsets, and plain and plateauinterruptions are the northward-trending, somewhat regular, and con-tinuous mountain ranges that constitute the southern Rockies. There. Fig. 117. — Location map of the southern Rockies. ROCKY MOUNTAINS. Ill 357 appears to be a rather well-marked and consistently developed mountainplan in the eastern and central ranges of the district; the western-most ranges are of more diverse structure, topographic texture andorigin, and occur in groups of longer and shorter lengths arranged onthe whole with less regularity. Fig. 117 represents the locations of the main topographic features ofthe region, which fall readily into five categories: (i) The eastern foothills, of varied origin and commonly exhibiting thehogback type of topography. (2) The Colorado or Front Range and the Wet Mountains, consistingin a broad way of a great anticlinal from whose central granite axis theflanking sedimentary beds dip east and west. (3) The Park, Sawatch (Saguache of some maps), and Sangre deCristo ranges, all of which lie nearly on the same
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