Forest physiography; physiography of the United States and principles of soils in relation to forestry . dred miles long and vary from a few feet to morethan a hundred feet in height.* That they are recent fault scarps isshown by the fact that they commonly occur in Quaternary lake de-posits and recent alluvial slopes but little modified by erosion; andin many instances they are without vegetation. Similar scarps havebeen observed at the eastern base of the Sierra Nevada and at the foot 1 G. A. Waring, Geology and Water Resources of a Portion of South-Central Oregon,Water-Supply Paper U. S. Ge
Forest physiography; physiography of the United States and principles of soils in relation to forestry . dred miles long and vary from a few feet to morethan a hundred feet in height.* That they are recent fault scarps isshown by the fact that they commonly occur in Quaternary lake de-posits and recent alluvial slopes but little modified by erosion; andin many instances they are without vegetation. Similar scarps havebeen observed at the eastern base of the Sierra Nevada and at the foot 1 G. A. Waring, Geology and Water Resources of a Portion of South-Central Oregon,Water-Supply Paper U. S. Geol. Surv. No. 220, igo8, p. 26. 2 W. M. Davis, The Mountain Ranges of the Great Basin, Bull. Mus. Com. Zoo!., , p. 160. I. C. Russell, Geological History of Lake Lahonton, a Quaternary Lake of NorthwesternNevada, Mon. U. S. Geol. Surv., vol. 11, p. 274.* Idem, p. 375. 226 FOREST PHYSIOGRAPHY of the slopes of many of the Basin Ranges. In the Lahonton area recentfault scarps are a common feature in the topography of the 54. Scarps of a similar nature were first observed in the Great. Fig. 59. — Post-Quaternary fault on the south shore of Humboldt Lake. (Russell, U. S. Geol. Surv.) Basin by Gilbert and were recognized as the result of recent crustalmovements.^ The recent faults of the Basin Ranges occur most commonly on the steeper sides of themountains and invariably the throw is toward the valley. Occasionally they cross streamchannels and cause rapids, as in the case of the American Fork, Utah, where it crosses theWasatch fault. The distribution of recent faults is in marked sympathy with the ancientlines of displacement as determined by evidences of a topographic character such as havejust been outlined. But it should be remembered that the recent faults are but a small frac-tion of the entire displacement. STREAM PROFILES AND RECENT FAULTING Among the significant elements of topographic form indicative ofrecent faulting are the abnormal profiles of many s
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