File:Forest physiography; physiography of the United States and principles of soils in relation to forestry (1911) (14590490147).jpg

Identifier: forestphysiograp01bowm (find matches)
Title: Forest physiography; physiography of the United States and principles of soils in relation to forestry
Year: 1911 (1910s)
Authors: Bowman, Isaiah, 1878-1950
Subjects: Physical geography Forests and forestry Soils
Publisher: New York, J. Wiley & sons (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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e up to 1500 feet of struc-tural displacement, and the topographic depression thus created is about 1000 feet deep. Theoccurrence is of particular interest because it is so clear-cut as to strengthen the previous ex-planations of the fault origin of scarps and troughs of similar character in adjacent tracts wherea stratigraphic means for the determination of the amount of faulting is not at hand .2 On the western shores of Lake Champlain and on the shores of manyother larger lakes of the Adirondacks, block-faulting has given a charac-teristic outline to the coastal topography. Sharp headlands with definite 1 See the Broadalbin quadrangle, U. S. Geol. Surv. W. J. Miller, Trough Faulting in the Southern Adirondacks, Science, n. s., vol. 32, 1910,pp. 95-96. 582 FOREST PHYSIOGRAPHY trend project from the general course of the coast and in many cases formthe extensions of block-faulted mountains whose intervening valleys,formed on the downthrown blocks, are submerged. In general the faults
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Scale of 3Iiles Contour interval 100 feet Fig. 235.— Rectangular pattern of relief and drainage lines in fault-block mountains of the eastern Adiron-dacks. (Part of Elizabethtown quadrangle, U. S. Geol. Surv.) are compound, giving a terraced quality to the mountain slopes. Onthe slopes bordering Lake George the trees grow in pronounced rowsor bands on these structural terraces, with thinner lines or bands betweenwhere the steeper slopes, thinly covered with soil, supply but little avail- LAURENTIAN PLATEAU AND ITS OUTLIERS 583 able plant food or moisture. The ridge from Black to Elephant Moun-tain is likewise of this character. In addition to the fault valleys just described are a second set ofvalleys of quite different characteristics and origin. These exhibitbroad expanses with gentle slopes and a mature topography. Theydepart from the courses common to the fault type of valley and aregenerally arranged in two lines, north-south and east-west. The valleyof Schroon Lak,e, parts of

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